WO2015192172A1 - Inoculants and methods for use thereof - Google Patents
Inoculants and methods for use thereof Download PDFInfo
- Publication number
- WO2015192172A1 WO2015192172A1 PCT/AU2015/000360 AU2015000360W WO2015192172A1 WO 2015192172 A1 WO2015192172 A1 WO 2015192172A1 AU 2015000360 W AU2015000360 W AU 2015000360W WO 2015192172 A1 WO2015192172 A1 WO 2015192172A1
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- WIPO (PCT)
- Prior art keywords
- microorganism
- leguminous plant
- actinobacterial
- streptomyces
- rhizobial
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Classifications
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
- A01N63/00—Biocides, pest repellants or attractants, or plant growth regulators containing microorganisms, viruses, microbial fungi, animals or substances produced by, or obtained from, microorganisms, viruses, microbial fungi or animals, e.g. enzymes or fermentates
- A01N63/20—Bacteria; Substances produced thereby or obtained therefrom
- A01N63/28—Streptomyces
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01H—NEW PLANTS OR NON-TRANSGENIC PROCESSES FOR OBTAINING THEM; PLANT REPRODUCTION BY TISSUE CULTURE TECHNIQUES
- A01H3/00—Processes for modifying phenotypes, e.g. symbiosis with bacteria
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
- A01N63/00—Biocides, pest repellants or attractants, or plant growth regulators containing microorganisms, viruses, microbial fungi, animals or substances produced by, or obtained from, microorganisms, viruses, microbial fungi or animals, e.g. enzymes or fermentates
- A01N63/20—Bacteria; Substances produced thereby or obtained therefrom
-
- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
- C12N1/00—Microorganisms, e.g. protozoa; Compositions thereof; Processes of propagating, maintaining or preserving microorganisms or compositions thereof; Processes of preparing or isolating a composition containing a microorganism; Culture media therefor
- C12N1/20—Bacteria; Culture media therefor
-
- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
- C12N1/00—Microorganisms, e.g. protozoa; Compositions thereof; Processes of propagating, maintaining or preserving microorganisms or compositions thereof; Processes of preparing or isolating a composition containing a microorganism; Culture media therefor
- C12N1/20—Bacteria; Culture media therefor
- C12N1/205—Bacterial isolates
-
- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
- C12N15/00—Mutation or genetic engineering; DNA or RNA concerning genetic engineering, vectors, e.g. plasmids, or their isolation, preparation or purification; Use of hosts therefor
- C12N15/09—Recombinant DNA-technology
- C12N15/63—Introduction of foreign genetic material using vectors; Vectors; Use of hosts therefor; Regulation of expression
- C12N15/79—Vectors or expression systems specially adapted for eukaryotic hosts
- C12N15/82—Vectors or expression systems specially adapted for eukaryotic hosts for plant cells, e.g. plant artificial chromosomes (PACs)
- C12N15/8241—Phenotypically and genetically modified plants via recombinant DNA technology
- C12N15/8261—Phenotypically and genetically modified plants via recombinant DNA technology with agronomic (input) traits, e.g. crop yield
-
- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
- C12N15/00—Mutation or genetic engineering; DNA or RNA concerning genetic engineering, vectors, e.g. plasmids, or their isolation, preparation or purification; Use of hosts therefor
- C12N15/09—Recombinant DNA-technology
- C12N15/63—Introduction of foreign genetic material using vectors; Vectors; Use of hosts therefor; Regulation of expression
- C12N15/79—Vectors or expression systems specially adapted for eukaryotic hosts
- C12N15/82—Vectors or expression systems specially adapted for eukaryotic hosts for plant cells, e.g. plant artificial chromosomes (PACs)
- C12N15/8241—Phenotypically and genetically modified plants via recombinant DNA technology
- C12N15/8261—Phenotypically and genetically modified plants via recombinant DNA technology with agronomic (input) traits, e.g. crop yield
- C12N15/8271—Phenotypically and genetically modified plants via recombinant DNA technology with agronomic (input) traits, e.g. crop yield for stress resistance, e.g. heavy metal resistance
- C12N15/8279—Phenotypically and genetically modified plants via recombinant DNA technology with agronomic (input) traits, e.g. crop yield for stress resistance, e.g. heavy metal resistance for biotic stress resistance, pathogen resistance, disease resistance
-
- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12R—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES C12C - C12Q, RELATING TO MICROORGANISMS
- C12R2001/00—Microorganisms ; Processes using microorganisms
- C12R2001/01—Bacteria or Actinomycetales ; using bacteria or Actinomycetales
- C12R2001/465—Streptomyces
Definitions
- the present invention relates to methods for enhancing at least one growth parameter of a leguminous plant via co-inoculation of a leguminous plant with at least one rhizobial microorganism together with at least one actinobacterial microorganism.
- the present invention also relates to leguminous plants co-inoculated with at least one rhizobial microorganism together with at least one actinobacterial microorganism, as well as specific actinobacterial strains and inoculant compositions which are useful in accordance with the present invention.
- Actinobacteria are a large group that includes different genera of Gram-positive bacteria with a high G-C content in their DNA. Actinobacteria are widely distributed in terrestrial environments and some, like the nitrogen-fixing symbionts Frankia, are known to form associations with plants through symbiotic relationships. Recent studies have also found that endophytic actinobacteria produced plant growth-promoting compounds such as indole-3- acetic acid (IAA) and siderophores.
- IAA indole-3- acetic acid
- Antagonism was also examined between actinobacteria and 12 strains of rhizobia from five soil samples by Patel (Plant and Soil 41 : 395-402, 1974). It was reported that about 23-70% of the actinobacteria inhibited the rhizobia strains.
- sequence identifier number SEQ ID NO:
- SEQ ID NO: A summary of the sequence identifiers is provided below:
- the present invention provides a method for enhancing at least one growth parameter of a leguminous plant, the method comprising co- inoculating the leguminous plant with:
- an "actinobacterial microorganism" as referred to herein should be understood to include any microorganism of the phylum Actinobacteria.
- the actinobacterial microorganism is an endophytic actinobacterial microorganism.
- An "endophytic" actinobacterial organism should be understood to include any actinobacterial organism that is able to live within a plant for at least a part of its lifecycle without causing apparent disease.
- an endophyte may also be able to complete its lifecycle in the absence of a plant host, and thus only be an opportunistic endophyte.
- an endophytic actinobacterial microorganism refers to an actinobacterial microorganism which may be isolated from surface-sterilised healthy plant tissue.
- actinobacterial endophytes For reference, an example of isolation of actinobacterial endophytes from surface sterilised plant tissue is set out in Coombs & Franco (Appl. Environ. Micro. 69(9): 5603-5608, 2003).
- the actinobacterial microorganism is from a genus selected from Streptomyces, Microbispora or Micromonospora.
- the actinobacterial microorganism is from the genus Streptomyces.
- the actinobacterial microorganism is from a species selected from:
- Streptomyces badius or Streptomyces parvus
- the actinobacterial microorganism is from a species selected from Streptomyces ciscaucasicus, Streptomyces canus or Streptomyces rishiriensis.
- the actinobacterial microorganism comprises a 16S rRNA gene nucleotide sequence which is at least 90% identical to one or more of: SEQ ID NO: 3; SEQ ID NO: 4; SEQ ID NO: 5; SEQ ID NO: 6; SEQ ID NO: 7, SEQ ID NO: 8, SEQ ID NO: 9 and/or SEQ ID NO: 10.
- the actinobacterial microorganism comprises a 16S rRNA gene nucleotide sequence which is at least 90% identical to one or more of SEQ ID NO: 5 and/or SEQ ID NO: 6.
- the actinobacterial microorganism comprises a 16S rRNA gene nucleotide sequence which is at least 90%, at least 91 %, at least 91 .5%, at least 92%, at least 92.5%, at least 93%, at least 93.5%, at least 94%, at least 94.5%, at least 95%, at least 95.5%, at least 96%, at least 96.5%, at least 97%, at least 97.5%, at least 98%, at least 98.1 %, at least 98.2% at least 98.3%, at least 98.4%, at least 98.5%, at least 98.6%, at least 98.7%, at least 98.8%, at least 98.9%, at least 99%, at least 99.1 %, at least 99.2% at least 99.3%, at least 99.4%, at least 99.5%, at least 99.6%, at least 99.7%, at least 99.8% at least 99.9% or 100% sequence identity to a comparison window of
- the compared nucleic acid sequences should be compared over a comparison window of, for example, at least 100 nucleotide residues, at least 300 nucleotide residues, at least 600 nucleotide residues, at least 1000 nucleotide residues, at least 1 100 nucleotide residues, at least 1200 nucleotide residues, at least 1300 nucleotide residues or at least 1400 nucleotide residues.
- the comparison window may comprise the region in each of the compared nucleotide sequences between and including the binding sites of the 27f primer (SEQ ID NO: 1 ) and the 1465r primer (SEQ ID NO: 2) on the compared nucleotide sequences.
- the comparison window may comprise additions or deletions (ie. gaps) of about 20% or less as compared to the reference sequence (which does not comprise additions or deletions) for optimal alignment of the two sequences.
- Optimal alignment of sequences for aligning a comparison window may be conducted by computerized implementations of algorithms such as the BLAST family of programs as, for example, disclosed by Altschul et al. (Nucl. Acids Res. 25: 3389-3402, 1997). A detailed discussion of sequence analysis can be found in Unit 19. 3 of Ausubel et al. (Current Protocols in Molecular Biology, John Wiley & Sons Inc, 1994-1998, Chapter 15,1998).
- Streptomyces sp. LuP30 The first deposited microorganism, referred to herein as Streptomyces sp. LuP30, has been deposited at the National Measurement Institute (NMI), Australia on 12 December 2013 under accession number V13/030101 .
- the actinobacterial microorganism is Streptomyces sp. LuP30 as deposited with the National Measurement Institute, Australia under accession number V13/030101 ; or a mutant or derivative of said microorganism that retains the ability to enhance at least one growth parameter of a leguminous plant when the actinobacterial microorganism co- inoculated onto a leguminous plant with with a rhizobial microorganism.
- the second deposited microorganism referred to herein as Streptomyces sp. LuP47B, has been deposited at the National Measurement Institute (NMI), Australia on 12 December 2013 under accession number V13/030100.
- the actinobacterial microorganism is Streptomyces sp. LuP47B as deposited with the National Measurement Institute, Australia under accession number V13/030100; or a mutant or derivative of said microorganism that retains the ability to enhance at least one growth parameter of a leguminous plant when the actinobacterial microorganism is co-inoculated onto a leguminous plant with a rhizobial microorganism.
- the actinobacterial microorganism is Streptomyces sp. EN23 as described in PCT publication WO/2005/003328 and deposited as AGAL Deposit No. NM03/35605; or a mutant or derivative of said microorganism that retains the ability to enhance at least one growth parameter of a leguminous plant when the actinobacterial microorganism is co-inoculated onto a leguminous plant with a rhizobial microorganism.
- the actinobacterial microorganism is Streptomyces sp. EN27 as described in PCT publication WO/2005/003328 and deposited as AGAL Deposit No. NM03/35606; or a mutant or derivative of said microorganism that retains the ability to enhance at least one growth parameter of a leguminous plant when the actinobacterial microorganism is co-inoculated onto a leguminous plant with a rhizobial microorganism.
- a "mutant or derivative" of the subject actinobacterial microorganisms should be understood to encompass, for example, any spontaneous or induced mutant, conjugation progeny or genetically modified form of the deposited strains which retains the ability to enhance at least one growth parameter of a leguminous plant when the actinobacterial microorganism is co-inoculated onto a leguminous plant with a rhizobial microorganism.
- Mutagenisation techniques that may be used to generate derivatives or mutants include, for example, chemical mutagenesis (eg. EMS mutagenesis), ionising radiation-induced mutagenesis (eg. X-ray mutagenesis, ⁇ -ray mutagenesis and UV mutagenesis), genetic insertion mutagenesis methods (eg. transposon mutagenesis) and the like.
- chemical mutagenesis eg. EMS mutagenesis
- ionising radiation-induced mutagenesis eg. X-ray mutagenesis, ⁇ -ray mutagenesis and UV mutagenesis
- genetic insertion mutagenesis methods eg. transposon mutagenesis
- the present invention contemplates a method for enhancing at least one growth parameter of a leguminous plant.
- a "growth parameter" of a leguminous plant can include any measurable characteristic of the leguminous plant.
- the growth parameter is a length and/or mass of a shoot of the leguminous plant.
- the growth parameter is a length and/or mass of a root of the leguminous plant.
- the growth parameter is a number and/or mass of nodules of the leguminous plant.
- the growth parameter is a number and/or mass of seed pods and/or seed produced by the leguminous plant. In some embodiments, the growth parameter is a concentration and/or amount of a nutrient in the leguminous plant. In some embodiments, the nutrient is selected from: Boron, Calcium, Copper, Magnesium, Manganese, Phosphorous, Sodium, Sulphur, Nitrogen and/or Zinc.
- the concentration and/or amount of the nutrient may be measured using any method known in the art to be suitable for the relevant nutrient. Such methods may include, for example, the methods described by: Kirsten (Organic Elemental Analysis - Ultramicro, Micro and Traces Methods. Academic Press, New York, 1984); Horwath (Instrumental Organic Analylsis. Academic Press, New York, 1977); Colombo and Giazzi (American Laboratory 38-45, 1982); Fraisse and Schmidt (J. Microchem. 22: 109-130, 1977); Hegedus (Microchim. Acta 441 -446, 1977); and Baur and Dirscherl (Microchim. Acta 1 : 299-244, 1980).
- Kirsten Organic Elemental Analysis - Ultramicro, Micro and Traces Methods. Academic Press, New York, 1984
- Horwath Instrumental Organic Analylsis. Academic Press, New York, 1977
- Colombo and Giazzi American Laboratory 38-45, 1982
- Fraisse and Schmidt J. Microchem. 22
- the nutrient is Nitrogen.
- the growth parameter is a germination rate of a leguminous plant seed.
- “germination rate” may refer to the proportion of seeds of a leguminous plant that successfully germinate.
- “germination rate” may refer to a speed of germination of a leguminous plant seed, and/or a proportion of seeds of a leguminous plant that successfully germinate per unit time, for example the proportion of seeds of a leguminous plant that successfully germinate per 1 , 2, 3, 4, 5, 6, 7, 8, 9, 10, 1 1 , 12, 14, 15, 16, 17, 18, 19 or 20 days.
- the "germination rate" of a leguminous plant seed may be assessed using any suitable laboratory based or field based method, as would be readily ascertained by those skilled in the art.
- the present invention contemplates “enhancement” of the one or more growth parameters of the leguminous plant.
- "Enhancement” of a growth parameter should be understood to include any improvement in a growth parameter in a co-inoculated leguminous plant relative to a leguminous plant of the same taxon that has not been co-inoculated in accordance with the method of the present invention.
- enhancement of a growth parameter will include an increase in the measured value of the growth parameter.
- enhancement of a growth parameter may comprise enhancement within a particular time period.
- enhancement of the growth parameter may comprise enhancement over a time period of at least 1 , 2, 3, 4, 5, 6, 7, 8, 9, 10, 1 1 , 12, 13, 14, 15, 16, 17, 18, 19, 20, 21 , 22, 23, 24, 25, 26, 27, 28, 29, 30, 31 , 32, 33, 34, 35, 36, 37, 38, 39, 40, 41 , 42, 43, 44, 45, 46, 47, 48, 49, 50, 60, 70, 80, 90 or 100 days.
- an "increase" in a growth parameter may include, for example, a 1 %, 5%, 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, 100%, 2-fold, 5-fold, 10-fold, 20 fold, 50-fold, 100-fold increase in the growth parameter in a co-inoculated leguminous plant relative to a leguminous plant of the same taxon that has not been co-inoculated.
- "enhancement" of the growth parameter may include a decrease in the measured value of the growth parameter.
- a decrease in the concentration and/or amount of a pathogen, disease symptom and/or toxin in the plant, and or a decrease in the time of germination of a leguminous plant seed may be considered “enhancement" of such growth parameters.
- an "decrease" in a growth parameter may include, for example, a 1 %, 5%, 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, 91 %, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, 100% decrease in the growth parameter in a co-inoculated leguminous plant relative to a leguminous plant of the same taxon that has not been co-inoculated.
- the present invention contemplates co-inoculating the leguminous plant with at least one rhizobial microorganism and at least one actinobacterial microorganism.
- a "rhizobial microorganism” as referred to herein may include any microorganism that is capable of fixing nitrogen after becoming established in a root nodule of a leguminous plant.
- Rhizobial microorganisms are a paraphyletic group that generally fall into two classes of the proteobacteria, the alpha- and beta-proteobacteria. Most rhizobial microorganisms belong to the order Rhizobiales, but several rhizobia occur in distinct bacterial orders of the proteobacteria.
- rhizobial microorganisms examples include:
- Bradyrhizobium spp. such as B. canariense, B. elkanii, B. japonicum, B. liaoningense and B. yuanmingense;
- Ochrobactrum spp. such as O. cytisi and O. lupini
- Azorhizobium spp. such as A. caulinodans and A. doebereinerae;
- Devosia spp. such as D. neptuniae
- Methylobacterium spp. such as M. nodularis
- Mesorhizobium spp. such as M. albiziae, M. amorphae, M. chacoense,
- Rhizobium spp. such as R. cellulosilyticum, R. daejeonense, R. etli, R. galegae, R. gallicum, R. giardinii, R. hainanense, R. huautlense, R. indigoferae, R. leguminosarum, R. loessense, R. lupini, R. lusitanum, R. mongolense, R. miluonense, R. sullae, R. tropici, R. undicola and R. yanglingense;
- Sinorhizobium spp. such as S. abri, S. adhaerens, S. americanum, S. arboris, S. fredii, S. indiaense, S. kostiense, S. kummerowiae, S. medicae, S. meliloti, S. mexicanus, S. morelense, S. saheli, S. terangae and S. xinjiangense;
- Burkholderia spp. such as B. caribensis, B. dolosa, B. mimosarum, B. phymatum and B. tuberum;
- Cupriavidus spp. such as C. taiwanensis
- Herbaspirillum spp. such as H. lusitanum.
- the rhizobial microorganism is a Rhizobium spp., a Sinorhizobium spp. or Ensifer spp., or a Bradyrhizobium spp.
- the rhizobial microorganism is of the species Sinorhizobium meliloti or Sinorhizobium medicae.
- the rhizobial microorganism is selected from the list of: S. meliloti strain RRI128 (referred to hereafter as 'RRI128'), Sinorhizobium strain SRDI736 (referred to hereafter as 'SRDI736') or S. medicae strain WSM1 1 15G (referred to hereafter as 'WSM1 1 15G').
- the rhizobial microorganism is of the species Rhizobium leguminosarum. In some embodiments, the rhizobial microorganism is selected from the list of: R. leguminosarum bv. viciae (referred to hereafter as 'WSM1455') or R. leguminosarum bv. trifolii (referred to hereafter as 'WSM1325').
- the rhizobial microorganism is of the species Bradyrhizobium sp. lupini or Bradyrhizobium japonicum. In some embodiments, the rhizobial microorganism is selected from the list of: Bradyrhizobium sp. lupini strain WSM471 (referred to hereafter as 'WSM471 ') or Bradyrhizobium japonicum strain CB1809 (referred to hereafter as 'CB1809').
- rhizobial microorganisms are available from a range of commercial culture collections, as would be readily ascertained by those skilled in the art. In relation to a range of the rhizobial microorganisms described herein, these organisms can be accessed from the rhizobium culture collection of the South Australian Research & Development Institute (Plant Research Centre, Hartley Grove, Urrbrae SA 5064, Australia; www.sardi.sa.gov.au).
- the present invention contemplates a method for enhancing at least one growth parameter of a leguminous plant.
- leguminous plant as referred to herein should be understood as any member of the Fabaceae (or Leguminosae) that can form nodules when infected with a rhizobial microorganism.
- leguminous plants include:
- Medicago spp. such as Medicago sativa (also referred to as lucerne or alfalfa);
- Pisum spp. such as Pisum abyssinicum (syn. P. sativum subsp. abyssinicum), Pisum fulvum, Pisum sativum, Pisum sativum subsp. elatius (syn. P. elatius, P. syriacum) and Pisum sativum subsp. sativum;
- Glycine spp. such as Glycine max, Glycine albicans, Glycine aphyonota, Glycine arenaria, Glycine argyrea, Glycine canescens, Glycine clandestine, Glycine curvata, Glycine cyrtoloba, Glycine falcate, Glycine gracei, Glycine hirticaulis, Glycine hirticaulis subsp.
- Cicer spp. such as Cicer arietinum
- Vicia spp. such as V. faba;
- Vigna spp. such as V. aconitifolia, V. angularis, V. mungo, V. radiate, V. subterranean, V. umbellatta or V. unguiculata
- Lathyrus spp. such as Lathyrus sativus or Lathyrus tuberosus
- Lens spp. such as L. culinaris
- Lablab spp. such as L. purpureus
- Phaseolus spp. such as P. acutifolius, P. coccineus, P. lunatus, P. vulgaris, P. polyanthus or P. Dumosus;
- Psophocarpus spp. such as P. tetragonolobus
- Cajanus spp. such as C. cajan
- Cyamopsis spp. such as C. tetragonoloba
- Canavalia spp. such as C. ensiformis or C. gladiata;
- Macrotyloma spp. such as M. uniflorum
- Lupinus spp. such as L. mutabilis or L. albus; or
- Erythrina spp. such as £. herbacea.
- Trifolium spp. such as Trifolium subterraneum
- the leguminous plant is a Medicago spp. plant. In some embodiments, the leguminous plant is a Medicago sativa, lucerne or alfalfa plant.
- the leguminous plant is a Trifolium sp. In some embodiments, the leguminous plant is a Trifolium subterraneum plant.
- the leguminous plant is Pisum sp. In some embodiments, the leguminous plant is a Pisum sativum plant. In some embodiments, the leguminous plant is a Glycine sp. In some embodiments, the leguminous plant is a Glycine max plant.
- the present invention contemplates co-inoculating a leguminous plant with a rhizobial microorganism and an actinobacterial microorganism.
- co-inoculating should be understood to include any method or process wherein a leguminous plant (including a leguminous plant seed) is brought into contact with a rhizobial microorganism and an actinobacterial microorganism.
- co-inoculation may comprise the rhizobial microorganism and/or actinobacterial microorganism being applied to a leguminous plant seed. Examples of leguminous plant seed inoculation are described by Hartley et al.
- co-inoculation may comprise the rhizobial microorganism and/or actinobacterial microorganism being applied to soil in which a leguminous plant is growing.
- co-inoculation may comprise the rhizobial microorganism and/or actinobacterial microorganism being applied to root and/or shoot tissue of a leguminous plant.
- "co-inoculating" may also comprise where the actinobacterial microorganism or rhizobial microorganism is pre-existing in the environment (eg. soil) into which a leguminous plant is grown.
- co- inoculation may comprise application of an actinobacterial microorganism to a plant or soil and wherein a natural or pre-existing rhizobial microorganism in the soil co-inoculates the plant.
- the leguminous plant is exposed to a pathogen and, when exposed to the pathogen, the co-inoculated leguminous plant has at least one enhanced growth parameter relative to a leguminous plant of the same taxon that has not been co-inoculated.
- the pathogen is a root pathogen.
- a "root pathogen" as referred to herein should be understood to include any leguminous plant pathogen that infects and/or damages the roots of the leguminous plant. Examples of root pathogens of leguminous plants include fungal, oomycete, bacterial and/or nematode pathogens.
- the root pathogen is a nematode root pathogen such as a Pratylenchus spp., such as P. neglectus or P. thornei.
- the root pathogen is an oomycete root pathogen such as a Phytophthora spp., such as P. sojae.
- the pathogen is a fungal pathogen.
- Leguminous plants may be subject to attack by a range of fungal pathogens, including fungal root pathogens. Examples of such pathogens include Rhizoctonia spp., Pythium spp. or Aphanomyces spp.
- the pathogen is a Rhizoctonia sp. In some embodiments, the pathogen is Rhizoctonia solani. In some embodiments the pathogen is Rhizoctonia solani AG8.
- the present invention provides a leguminous plant, a leguminous plant part or leguminous plant reproductive material, co-inoculated with at least one rhizobial microorganism and at least one actinobacterial microorganism.
- the leguminous plant contemplated in the second aspect of the invention may be any leguminous plant as hereinbefore described with reference to the first aspect of the invention.
- a plant, plant part or plant reproductive material should be understood to encompass tissues, organs, whole organisms and parts thereof.
- the term plant, plant part, or plant reproductive material should also be understood to encompass multicellular aggregations of cultured cells such as colonies, plant calli, suspension cultures and the like.
- the leguminous plant part or plant reproductive material may include a leguminous plant seed.
- a plant "seed” should be understood to refer to a mature or immature plant seed.
- the term “seed” includes, for example, immature seed carried by a maternal plant or seed released from the maternal plant.
- the term “seed” may encompass any seed plant sporophyte between the developmental stages of fertilisation and germination.
- the actinobacterial microorganism contemplated in accordance with the second aspect of the invention is an actinobacterial microorganism as hereinbefore described with reference to the first aspect of the invention.
- the rhizobial microorganism contemplated in accordance with the second aspect of the invention is a rhizobial microorganism as hereinbefore described with reference to the first aspect of the invention.
- the present invention provides an isolated actinobacterial microorganism as deposited with the National Measurement Institute, Australia under accession number V13/030101 ; or a mutant or derivative of said microorganism that retains the ability to enhance at least one growth parameter of a leguminous plant when the actinobacterial microorganism is co-inoculated onto a leguminous plant with a rhizobial microorganism.
- the present invention provides an isolated actinobacterial microorganism as deposited with the National Measurement Institute, Australia under accession number V13/030100; or a mutant or derivative of said microorganism that retains the ability to enhance at least one growth parameter of a leguminous plant when the actinobacterial microorganism is co-inoculated onto a leguminous plant with a rhizobial microorganism.
- the present invention provides any of the hereinbefore described isolated actinobacterial microorganisms when used according to the method of the first aspect of the invention.
- the present invention also provides an inoculant composition comprising an actinobacterial microorganism.
- the actinobacterial microorganism comprises an actinobacterial microorganism as hereinbefore described with respect to the first aspect of the invention.
- the inoculant composition further comprises a rhizobial microorganism.
- the rhizobial microorganism comprises a rhizobial microorganism as hereinbefore described with respect to the first aspect of the invention.
- the inoculant composition comprises a carrier or additive.
- the carrier or additives used will depend on the nature of the inoculant composition.
- the inoculant composition may be in the form of a liquid composition, a solid composition (such as a powder, pellet or granular composition) a seed coating or the like.
- the inoculant compositions of the present invention may be adapted to be applied to a leguminous plant in any suitable way.
- the inoculant composition could be adapted to be applied as a seed coating, applied as a solid or liquid composition to the foliage or roots of a plant, or applied as a solid or liquid composition to soil before, during or after sowing of a leguminous plant.
- a range of useful carriers or additives would be readily apparent to those of skill in the art and may include, for example: one or more gums (including xanthan gum), clay or peat based carriers, one or more nutrients including carbon or nitrogen sources, one or more antifungal or antibacterial agents, one or more seed coating agents, one or more wetting agents and the like.
- the present invention provides the hereinbefore described inoculant composition when used according to the method of the first aspect of the invention.
- FIGURE 1 shows the cultivable actinobacterial endoflora isolated from roots and nodules of different legumes - including pea, lucerne, clover and medics.
- FIGURE 2 shows the beneficial effects of endophytic actinobacteria on germination of lucerne seeds on agar plates after 36 hours incubation. The plate on the left shows surface-sterilised seeds with 0.85% saline; the plant on the right shows surface-sterilised seeds coated with a spore suspension of LuP83 in 0.85% saline.
- FIGURE 3 shows indole acetic acid production by selected endophytic actinobacteria.
- FIGURE 4 shows the stimulation of the growth of Rhizobium leguminosarum bv. trifolii strain WSM 1325 and Bradyrhizobium lupini strain WSM 471 by two actinobacteria LuP30 and LuP47B after 5 days growth of the rhizobia on YMA medium at different concentrations of rhizobium.
- Panel A From top to bottom and left to right: WSM 1325 at 2 weeks old with 10 3 CFU per plate; LuP30 plugs on WSM 1325 with bigger colonies; WSM 471 at 7 days old with 10 5 CFU per plate (A) ISP2 control plugs, (B) LuP47B plugs and (C) LuP30 plugs; WSM 1325 at 7 days old with 10 5 CFU per plate.
- Panel B From right to left images the increase of the growth of two rhizobia when closer to the plug of LuP30 or LuP47B shown under microscopy.
- FIGURE 5 shows enhanced plant growth, nodule sizes and nitrogen fixation in lucerne plants co-inoculated with selected endophytic actinobacteria and S. meliloti RRI 128.
- Rhi. Rhizobium RRI128).
- A) and B plants and nodules in the seventh week after adding the rhizobia.
- C) and D plants and nodules in 45 days after adding the rhizobia.
- FIGURE 6 shows the total nitrogen fixed in the shoots of lucerne inoculated with endophytic actinobacteria EN23, LuP30 and LuP47B together with rhizobium RRI128.
- FIGURE 7 shows the effect of endophytic actinobacteria on the symbiosis of rhizobia and lucerne under nutrient limited conditions.
- Two surface sterilised lucerne seeds were sown into 65 g of autoclaved washed sand in a 50 ml tube containing 10mls of McKnight's + N starter (300 mg for 20 L) was added at day 0 and MQ water as required later.
- One seedling was kept in each tube with 12h light and 12h dark and five replicates for each treatment.
- One ml (around 10 8 cfu/ml) of the S. meliloti RRI 128 was added into each seedling for treatment plants after 6 days, and the plants were grown up to 7 weeks. Left plants were inoculated with RRI 128 only while right plants were co-applied with LuP5B and RRI 128
- FIGURE 8 shows the response of lucerne plants co-inoculated with LuP30 or LuP47B and different concentrations of S. meliloti RRI 128.
- Panel A is a graphical representation showing shoot, root and total plant dry weights after three weeks at three rhizobia concentrations: (A) 5x10 2 , (B) 5x10 4 , (C) 5x10 6 CFU.ml "1 . Error bars: Mean ⁇ S.E.
- Panel B is a photograph of representative lucerne plants in tubes three weeks after inoculation with S. meliloti RRI 128 at 5 x 10 2 CFU.ml "1 . Left- S. meliloti RRI 128 alone; right- S. meliloti RRI 128 plus LuP30.
- FIGURE 9 is a graphical representation showing lucerne shoot dry weight response by impact of LuP30 and LuP47B after 10, 21 and 35 days inoculation with S. meliloti RRI 128. Asterisks indicate significant differences at P ⁇ 0.05 ( * ) or P ⁇ 0.01 ( ** ).
- FIGURE 10 is a graphical representation showing accumulation of N ( 14 N and 15 N) in lucerne plants inoculated with rhizobia and actinobacteria.
- FIGURE 1 1 is a graphical representation showing the effects of LuP30 and LuP47B on growth and nodulation of clover when co-inoculated with Rhizobium WSM 1325. Asterisks indicate significant differences at p ⁇ 0.05 ( * ) or p ⁇ 0.01 ( ** ).
- TABLE 1 shows indole acetic acid production and phosphate solubilising activity of selected endophytic actinobacteria. (+) positive production; (-) no production.
- TABLE 2 shows in-vitro interaction assay results between selected endophytic actinobacteria and three different rhizobia at various concentrations.
- TABLE 5 shows the effects of endophytic actinobacteria, EN23, LuP30 and LuP47B on symbiosis of the rhizobia strain RRI 128 and lucerne in terms of nitrogen content and trace elements in lucerne shoots at 45 days old.
- TABLE 7 shows the effect of actinobacterial and rhizobial coinoculation on Rhizoctonia root rot of lucerne plants and growth characteristics of shoot and root dry weights.
- TABLE 8 shows 16S rRNA gene sequence identities of selected endophytic actinobacteria using BLASTN on GenBank.
- Control 3 uninoculated plants
- Control* 3 plants inoculated only with S.meliloti RRI 128;
- A) 3 ppm N
- B) 25 ppm N
- C) 50 ppm N;
- Asterisks indicate significant differences at P ⁇ 0.05 ( * ) or P ⁇ 0.01 ( ** ).
- TABLE 12 shows lucerne shoot dry weight in response to co-inoculation with LuP30 or LuP47B and S. meliloti RRI 128 after 10, 21 and 35 days at 25 ppm N ( 15 NH 4 15 N0 3 ). Asterisks indicate significant differences at p ⁇ 0.05.
- TABLE 15 shows the effects of two actinobacteria LuP30 and LuP47B on the growth of two rhizobial strains on agar plates at three concentrations after 7 days.
- TABLE 16 shows the growth and nodulation of soybean (Glycine max cv. Djackal) in response to co-inoculation with each of four strains of actinobacteria and Bradyrhizobium strain CB 1809, 4 weeks after inoculation.
- TABLE 17 shows the effect of actinobacteria on the elemental content of soy shoots (amount per plant).
- the plants were washed under running tap water to remove dust and soil attached to the roots and nodules.
- the roots and nodules were separated from the plants and air-dried overnight at room temperature.
- the dry roots and nodules were surface sterilized following the method of Coombs and Franco (Applied and Environmental Microbiology, Vol. 69: 5603-5608, 2003).
- the surface sterilization process started by washing with absolute ethanol for 1 minute, followed by 6 minutes in 4% NaOCI, 30 seconds in absolute ethanol and a final wash with autoclaved R.O. water.
- nodules were snipped out from the roots and crushed in 0.9% saline until forming a homogenous mixture.
- the nodule suspension was spread onto the surface of at least three different isolation media.
- the sterilized roots were air dried before being cut into approximately 1 cm fragments by a blade or scissors, and placed onto the different media plates. Plates were incubated at 27°C and 37°C.
- the plates were checked regularly at least once per week from the first week until new single colonies could not be found. When colonies appeared, they were transferred to half strength potato dextrose agar (HPDA) for purification. The single colonies were transferred onto three different media such as HPDA, oatmeal agar (ISP3) and mannitol soybean agar (MS) to distinguish them based on their different morphologies, colour and pigments produced (media recipes all per Atlas, Handbook of Microbiological Media, 1993).
- HPDA potato dextrose agar
- ISP3 oatmeal agar
- MS mannitol soybean agar
- Lucerne seeds were placed in Petri dishes (usually 2-3 times the required amount) and surface sterilized by the following method: 30 seconds in 70% (v/v) ethanol, 2-3 minutes in 3% (v/v) hypochlorite solution, rinsed three times in autoclaved R.O. water, remaining in the third rinse for 10 minutes then left under the laminar flow to dry.
- Five sterilized seeds were put on a McKnight's solution 1 % agar plate with one drop of an isolated actinobacteria suspension (200 - 2000 cells) applied to each seed while the control seeds received one drop of 0.9% saline.
- the plates were left under a 14 hour light cycle per day at room temperature (20-30°C) for 2 weeks. The number of germinated seeds and the length of roots were recorded.
- Lucerne seeds were also sterilized as described above and the sandy loam was autoclaved at 121°C for 15 minutes. Twelve percent moisture sandy loam was made by adding McKnight's solution before adding 300 g of sandy loam with 20 sterilized seeds to a small basket, 10 cm wide and 20 cm length. The seeds were sown with actinobacterial suspension applied on the top before slightly covering with sandy loam. The baskets were kept under a 14 hour light / 10 hour dark cycle at room temperature (20-30°C) for 2 weeks. The number of seeds germinated was recorded, and when germinated, the length of the roots was measured. A total of 148 well-sporulating actinobacteria were tested.
- the phosphate solubilisation ability of selected isolates was detected following the method described by Beneduzi et at. (Applied Soil Ecology 39: 31 1 -320, 2008).
- the actinobacteria isolates were inoculated on glucose yeast (GY) medium that contained 10 g of glucose, 2 g of yeast extract and 1 .5% agar in 1 L of distilled water.
- Two solutions were added to the medium, the first was 5 g of K2HPO4 in 50 ml distilled water and the second solution was 10 g of CaCI 2 in 100 ml of distilled water.
- These two solutions were autoclaved separately and added into the GY medium before pouring into plates. These two solutions changed the colour of the GY medium to white opaque showing the presence of insoluble calcium phosphate.
- a positive reaction was demonstrated by the presence of a clear zone in the area surrounding the isolates.
- Rhizobial strains were grown on yeast mannitol agar (YMA; Graham, Applied Microbiology 17(5): 769-770, 1969) plates or slants for 3-5 days before harvesting. The rhizobial strains were harvested and serially diluted in 0.9% saline. The OD at 600nm of the rhizobial solutions was checked and the number of colony-forming units was counted following the method of Miles and Misra (Journal Hygiene 38: 732-749, 1938). At the same time 100 ⁇ of these serial dilutions at different OD values were spread onto YMA plates and allowed to dry.
- Lucerne seeds were surface-sterilized as described above and sown in autoclaved pots. Each pot contained about 1 kg of sand and vermiculite mixture, and had two separate parts to allow easy drainage. Five and 148 endophytic actinobacteria isolated from surface-sterilized healthy wheat roots and surface-sterilized healthy root and nodules of four different legumes such as lucerne, pea, clover and medics, respectively, were coated on the surface of the lucerne seeds in a 0.3% (w/v) sterile xanthan gum solution. 100 ml of MQ water was added to each pot before planting the ten coated seeds. The top of the pot was covered with a thin layer of granulated plastic beads.
- leaves of lucerne plants were measured by a SPAD 502 meter (Chlorophyll meter SPAD-502, Konica Minolta) designed to indicate the amount of chlorophyll present in plant leaves. The three biggest leaves were checked to get SPAD readings. Moreover, dry leaves of control plants (only treated with Sinorhizobium), and plants treated with rhizobium and EN23 and EN27, LuP30 and LuP47B harvested in the seventh week were analysed for the content of nitrogen and other elements. The leaves were dried at 60°C for 48 h to obtain constant weight and were ground to about 1 mm in size for analysis.
- N 2 fixation associated with the shoots was calculated by the following equation:
- Lucerne seeds were surface sterilized and coated with actinobacteria as described above. Two coated seeds were sown in a 50 ml centrifuge tube containing 65 g of autoclaved washed sand and 10 ml of McKnight's starter N (0.133 mg) added five times less than compared with normal 0.665 mg per plant in pot assays. This was then covered by sand and plastic beads. The number of seedlings was thinned down to one seedling before inoculating with 10 8 CFU.mr 1 RRI 128 suspension. The tubes were kept inside the growth chamber with a 12 h light and 12 h dark cycle. Water was supplied as required until 7 weeks. DNA extraction
- phenolchloroform Six hundred microlitres of phenolchloroform was added and the tube was left at room temperature for 30 minutes with intermittent shaking every 10 minutes. After centrifuging at 12,000 rpm for 15 minutes, the supernatant was transferred to a new sterile 1 .5 ml eppendorf tube. An additional 500 ⁇ of chloroform was added to the tube and left at room temperature for 15 minutes with mixing by inversion every 7-8 minutes before centrifuging at 12,000 rpm for 15 minutes. The aqueous phase was transferred into a new sterile 1 .5 ml eppendorf tube before adding 20 ⁇ of 10 mg.ml "1 RNAse and incubating at 37°C for 60 minutes.
- a master mixture was prepared as 1 ⁇ of dNTPs (10 mM), 1 ⁇ of DNA Taq polymerase (5 ⁇ / ⁇ ), 5 ⁇ of ThermoPol buffer, 2 ⁇ of 27f primer (AGAGTTTGATCCTGGCTCAG; SEQ ID NO: 1 ), 2 ⁇ of 1465r primer (TACGGYTACCTTGTTACGACTT; SEQ ID NO: 2), 2 ⁇ of DNA sample and 37 ⁇ of injection water.
- PCR was performed by heating the PCR tubes at 94°C for 2 minutes, followed by 40 cycles of 94°C for one minute, 52°C for one minute and 72°C for two minutes, and 72°C for 10 minutes.
- 225 endophytic actinobacteria were isolated from roots and nodules of pea, lucerne, clover and medic. 73 were from nodules and 152 were from roots. Based on their morphology, 126 cultures (56%) belong to the genus Streptomyces, 54 (24%) belong to Microbispora, 20 (8.89%) belong to Micromonospora and 25 cultures are as yet unidentified. Humid acid vitamin B agar (HV), yeast extract casein dextrose (YECD) and tap water yeast extract (TWYE) media successfully allowed growth of almost all of the isolates mentioned. 125 cultures were isolated from HV medium, 72 cultures were from TWYE, 26 were from YECD and one of them was isolated from TSA.
- HV Humid acid vitamin B agar
- YECD yeast extract casein dextrose
- TWYE tap water yeast extract
- Table 1 a range of endophytic actinobacteria showed the ability to produce IAA.
- Table 1 also identifies cultures that were found to have phosphate solubilisation ability. They were LuP5B, LuP44 and LuP8A.
- rhizobia Two concentrations of rhizobia were tested for antagonism with 14 endophytic actinobacteria; five non-legume-isolated and nine legume-isolated cultures. As shown in Table 2, most of the endophytic actinobacteria had neutral or positive effects on growth of three rhizobia RRI128, SRDI736, WSM1 1 15G, except for LuP10, EN28 and EN46. LuP10 increased growth of the RRI 128 but inhibited growth of SRDI736 and WSM1 115G, whereas LuP3, LuP30 and LuP47B increased growth of the three rhizobia at the various concentrations.
- LuP30 and LuP47B showed significant rhizobial growth stimulation Rhizobium leguminosarum bv. trifolii strain WSM 1325 and Bradyrhizobium lupini strain WSM 471 .
- EN23 significantly increased the dry weight of each nodule, the total dry weight of nodules, nitrogen content of the plant as well as total nitrogen per plant, though it did not significantly increase the number of nodules per plant.
- Total mass per plant treated with EN23 increased by 25.7% compared with plants treated with the rhizobium only control.
- EN27 significantly reduced the number of nodules, the fresh weight of each nodule and the total dry weight of nodules per plant were higher than that of RRI128 only plants. Furthermore, EN27 also significantly increased the SPAD readings, nitrogen content (%N 2 ) and total nitrogen per plant. EN23 and EN27 increased the amount of N 2 fixed in the shoots, by 0.85 and 0.80 mg per plant, respectively, compared with the RRI128 only plants (Table 3). In contrast, EN16 significantly reduced the number of nodules and total dry weight of nodules per plant after seven weeks from planting.
- EN28 and EN46 had no significant effect on the growth of lucerne plants with the RRI128.
- Nitrogen content was 2.725% of mass for the control, 3.225% of mass for EN23-treated and 3.65% for EN27- treated plants. There was 1 .38 mg of total N per control plant, while EN23 and EN27-treated plants had 2.23 mg and 2.18 mg total N, respectively.
- EXAMPLE 6 EFFECTS OF ENDOPHYTIC ACTINOBACTERIA ISOLATED FROM LEGUMES
- LuP47B and LuP30 showed beneficial effects on the symbiosis of rhizobium and lucerne, with increased height of shoot, mass of shoot and plant and nitrogen fixation per plant. As shown in Table 4, treatment with these cultures led to an increase of 35.33% and 24.87% of shoot dry weight and 29.91 % and 25.87% of total mass per plant, respectively. LuP47B also increased the height of the shoot significantly, up to 26.25%. Although LuP30 did not significantly promote the height of the shoot, it developed a longer root compared with plants treated with RRI128 only.
- LuP10 increased the root biomass instead of root length.
- Table 5 the combination of rhizobium RRI128 and EN23 significantly increased copper, phosphorous, sodium and nitrogen content in the shoot compared with the RRI128 alone.
- LuP30 and LuP47B treatment resulted in a significant increase all of the trace elements tested, except iron with the presence of the RRI128.
- the shoot dry weight of plants inoculated with the RRI128 and LuP30 was less than that of plants treated with RRI128 and LuP47B they showed higher amounts of copper, iron and zinc compared with LuP47B.
- EN23, LuP30 and LuP47B also increased nitrogen content in the shoot, with 0.35, 0.61 and 0.83 mg per each shoot, respectively (see Figure 6).
- LuP5B significantly increased all growth parameters, such as height of shoot, length of root, shoot and root dry weight, except for number of nodules.
- LuP47B treatment resulted in increased length of root and shoot dry weight but LuP30 did not increase other parameters of plant growth.
- LuP12A increased root dry weight, it did not promote root length.
- LuP3 increased the length of root but it did not increase the root dry weight (Table 6).
- EXAMPLE 8 BIOCONTROL ACTIVITY IN PLANTA Fifty milliliter centrifugal tubes were used to screen for the biocontrol ability of actinobacterial strains against the fungal root pathogen Rhizoctonia. Forty five grams of autoclaved sandy loam were used at a 12% moisture content added as McKnight's starter nitrogen (266mg of ⁇ ⁇ ) solution. Two millet seeds infected with R. solani AG8 strain W19 were added at the top of the sandy loam, and a further 10 g of soil containing 12% moisture was added to cover the millet seeds. Two tubes without adding the infested millet seeds with the pathogen and without endophytic actinobacteria were as used as controls. The tubes were placed in a rack covered with aluminium foil and placed in a chamber for two weeks at 15°C in the absence of light.
- Lucerne seeds were surface-sterilized and pre-germinated with actinobacterial suspensions on autoclaved moist filter paper in petri dishes. When the roots were about 1 -3mm length they were dipped in 5ml (to cover all the seeds) of the rhizobial suspension (approximately 10 8 cfu/ml) for 3 minutes. Two pre- germinated and coated seeds were transferred into each 50 ml tube and covered with 5g of soil (12% moisture) and a layer of plastic beads. The tubes were kept at 15°C in a growth chamber for 3 weeks. There were two replicates of each treatment, and MQ water was added as required. The number of seedlings that emerged, the length of root and root damage were recorded.
- LuP3, LuP12A, LuP30, LuP47B, EN23, EN27, LuP8 and LuP44 were putatively identified as Streptomyces sp. by 16S rRNA gene sequencing.
- the determined 16S rRNA gene sequences for each organism were as follows:
- LuP12A GATGAACCACTTCGGTGGGGATTAGTGGCGAACGGGTGAGTAAC SEQ ID NO: 4
- LuP3 Streptomyces drozdowiczii with up to 99.4% 16S rRNA gene sequence identity.
- the closest match for LuP30 was Streptomyces rishiriensis, which showed up to 99.9% 16S rRNA gene identity.
- LuP12A, LuP47B, LuP8 and LuP44 are all very close to both Streptomyces ciscaucasicus and Streptomyces canus, with >99% 16S rRNA gene sequence identity.
- the factorial experiment comprised (i) 3 strains of actinobacteria, (ii) ⁇ inoculation with Sinorhizobium meliloti RRI 128 and (iii) 3 levels of soil NH 4 NO 3 .
- the pots were prepared and watered with a nitrogen deficient McKnight's solution supplemented with NH 4 NO3 to provide soil nitrogen of 3, 25 and 50 ppm.
- Plant seeds designated to rhizobia treatments were inoculated with a suspension (1 ml per plant containing 10 8 CFU) of rhizobia 6 days after sowing. Each treatment was replicated eight times.
- Pots were arranged in a completely randomised design in a greenhouse and plants four pots of each treatment were harvested at 4 and 7 weeks after inoculation with the S. meliloti RRI 128.
- S. meliloti RRI 128 co-inoculation of each of EN23, LuP30 and LuP47B with S. meliloti RRI 128 was able to statistically significantly improve at least one of root dry weight or shoot dry weight over the un-inoculated or Rhizobium only controls at at least one concentration of N.
- EXAMPLE 1 1 - EFFECT OF ACTINOBACTERIA/RHIZOBIA CO- INOCULATION ON GROWTH PARAMETERS OF LUCERNE AT DIFFERING DOSING OF RHIZOBIA INOCULATION
- the shoot dry weight and total mass per plant were increased up to about 50% to 60% and was similar with plants treated with the rhizobia at 10 4 and 10 6 CFU.ml "1 (see Figure 8A).
- co-inoculation with either LuP30 or LuP47B individually with S. meliioti RRI 128 at 5x10 2 CFU.ml "1 increased the number of nodules up to 7 and 9 per plant, respectively while control plants had 4.3 nodules per plant.
- Streptomyces spp. LuP30 and LuP47B were added as spores to lucerne seed with a sterile 0.3% xanthan gum solution and air dried before sowing. Seeds were treated with S. meliioti RRI 128. The planting process was as described in EXAMPLE 10.
- the nitrogen supplied was 15 NH 5 N0 3 (98%) with initial N concentration in soil (25 mg/kg 15 NH 4 15 N0 3 ). Plants were harvested after 10, 21 and 35 days after inoculation with the S. meliioti RRI 128. Nitrogen in shoot and root materials was analysed by mass spectrometry to determine the proportions of plant N derived from the atmosphere and soil.
- the plants were harvested at three times - at 10, 21 and 35 days after inoculation with S. meliioti RRI 128.
- the effectiveness of LuP30 and LuP47B was re-confirmed by the increase of the shoot dry weight and the number of nodules after 21 and 35 days co-inoculation with S. meliioti RRI 128 ( Figure 9) and (Table 12).
- the amount of 15 N and 14 N in plants was estimated by spectrometry and the total N in whole plant co-inoculation with LuP30 or LuP47B was increased up to 40 % and 60 % respectively compared with plants treated S. meliioti RRI 128 alone ( Figure 10).
- Clover cultivar Campeda (Trifolium subterraneum L.), was chosen to examine the effects of the two actinobacteria LuP30 and LuP47B which have shown an increase in growth and nitrogen fixation of lucerne in previous experiments.
- Rhizobial strain Rhizobium WSM 1325 was inoculated on seeds of clover.
- the factorial experiment comprised (i) two strains of actinobacteria (LuP30 and LuP47B), (ii) inoculation with rhizobia strain WSM1325 for clover. Growth of rhizobia and actinobacteria, plant growth media and nutrition, sowing and water supply were as described above. The concentration of NH 4 NO3 was supplied at 25 mg per kg of sand and vermiculite where the actinobacteria LuP30 and LuP47B showed increased plant growth and nitrogen fixation for lucerne plants. Eight replicates for each treatment with four pots each harvested at 4 and 7 weeks after inoculation with rhizobia.
- LuP30 or LuP47B The interaction between LuP30 or LuP47B on the growth of two rhizobia Rhizobium WSM 1325 and Bradyrhizobium WSM 471 was studied at three concentrations 10 4 , 10 6 and 10 8 CFU.mr 1 (or 10 3 , 10 5 and 10 7 cells on each agar plate) of the two rhizobial strains.
- the two actinobacteria LuP30 and LuP47B were grown on ISP2 for 7-10 days and agar plugs of the well grown cultures were placed onto the agar plates containing the three rates of rhizobia. The growth of the rhizobia was examined 5 to 14 days after adding the actinobacteria plugs.
- LuP30 and LuP47B showed positive and non-antagonistic effects on the growth of both rhizobia (Rhizobium WSM 1325 and Bradyrhizobium WSM 471 ).
- rhizobia Rhizobium WSM 1325 and Bradyrhizobium WSM 471 .
- concentrations of rhizobia less than 10 7 CFU.mr 1 or 10 5 CFU.ml "1 on each agar plate
- LuP30 and LuP47B promoted a visible increase in the growth of both rhizobia on YMA medium after 5 days incubation at 27°C (Table 15).
- the overall aim of this experiment was to evaluate a range of endophytic actinobacterial strains on the growth of soybean plants to determine whether these strains have a broad leguminous plant host range.
- the results of the study of plants harvested 4 weeks after the addition of the Bradyrhizbium inoculum to the actinobacterial-treated plants showed that 4 of the 18 strains tested had significantly improved plant growth and/ or nitrogen content of the soybean plants.
- Soybean seeds (Glycine max cv. Djackal) were surface-sterilised and coated with spores of actinobacteria suspended in 0.3% (v/w) xanthan gum. Coated seeds (1 per pot) were sown into a pasteurised potting mix ⁇ 1 kg (50:50 by volume of sand:vermiculite) contained in 1.25 L pots. 200 ml of nitrogen deficient McKnight's nutrient solution was applied at sowing and supplemented to provide 25 mg of NH 4 N03 per kg of potting media. Pots were arranged in a randomised block design with 5 replicates of each treatment. Plants were harvested at 4 weeks and 7 weeks after inoculation with Bradyrhizobium strain CB 1809.
- Treatments were nil control, rhizobia with no actinobacteria, and rhizobium plus each of the following Streptomyces strains: Str. EN23, Str. EN27, Str. LuP3, Str. LuP5, LuP8, Str. LuP10, Str. LuP12A, Str. LuP30, Str. LuP44, Str. LuP46B, Str. LuP47B, Str. LuP73B, Str. LuP75, Str. PG3, Str. PG4, Str. PP1 , Str. PP9, CM23.
- LuP47B As shown in Table 17, plants treated with LuP47B also had increased levels of iron, magnesium, phosphorus and nitrogen (27 %) compared with plants inoculated with Bradyrhizobium CB1809 only.
- LuP8 increased total N (23 %) and also iron.
- LuP30 increased iron content.
- LuP8 increased fresh weight of pods by 24 % and number of seeds per plant by 35%
- LuP47B increased the dry weight of seeds by 43% while LuP8 increased total dry weight of shoot and pods per plant by 24%.
- EXAMPLE 16 EFFECT OF ACTINOBACTERIA ON GROWTH AND SYMBIOSIS OF FIELD PEA (PISUM SP.)
- Pea field trials were sown Hart (28 May) and Riverton (10 June) in South Australia (SA), and at Pimpinio (15 May) in Victoria.
- the trials were arranged in randomised complete block design with 3 replicates, each comprising an uninoculated control and 3 inoculation treatments.
- Treatments were applied to Kaspa field pea which was sown to achieve a seedling density of 50 plants/m 2 .
- the rhizobia treatment (Rhizobium leguminosarum bv. viciae strain WSM1455) was applied at approximately 100 fold the rate recommended commercially.
- the co-inoculation treatment comprised the rhizobia treatment co-inoculated with Streptomyces sp.
- Table 19 shows nodule number, nodule weight, pod number and total plant biomass in pea plants grown in field trials at three sites (Riverton SA, Hart SA and Pimpinio Vic). A summary of the results shown in table 19 is:
Abstract
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US11516989B2 (en) | 2017-03-01 | 2022-12-06 | Indigo Ag, Inc. | Endophyte compositions and methods for improvement of plant traits |
US11882838B2 (en) | 2017-04-27 | 2024-01-30 | The Flinders University Of South Australia | Bacterial inoculants |
US11589579B2 (en) | 2017-09-22 | 2023-02-28 | Biotenzz Gesellschaft Für Biotechnologie Mbh | Polymeric particles containing microorganisms |
WO2022000018A1 (en) * | 2020-06-30 | 2022-01-06 | New Edge Microbials Pty Ltd | Novel actinobacteria |
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US20230071171A1 (en) | 2023-03-09 |
EP3157338A4 (en) | 2018-04-11 |
BR112016029884A2 (en) | 2017-10-24 |
MX367032B (en) | 2019-08-02 |
US11445729B2 (en) | 2022-09-20 |
AU2015278238A1 (en) | 2017-01-05 |
CA2952057A1 (en) | 2015-12-23 |
US20200037528A1 (en) | 2020-02-06 |
EP3157338A1 (en) | 2017-04-26 |
AU2018208672A1 (en) | 2018-08-09 |
US11425912B2 (en) | 2022-08-30 |
MX2019004177A (en) | 2019-08-05 |
US20170215358A1 (en) | 2017-08-03 |
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AU2020244433B2 (en) | 2023-04-06 |
BR112016029884B1 (en) | 2022-09-27 |
US10462990B2 (en) | 2019-11-05 |
AU2015278238B2 (en) | 2018-04-26 |
AU2020244433A1 (en) | 2020-10-29 |
MX2016016850A (en) | 2017-09-07 |
US20200029519A1 (en) | 2020-01-30 |
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