WO1992021757A1 - Nematode-responsive plant promoters - Google Patents
Nematode-responsive plant promoters Download PDFInfo
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- WO1992021757A1 WO1992021757A1 PCT/EP1992/001214 EP9201214W WO9221757A1 WO 1992021757 A1 WO1992021757 A1 WO 1992021757A1 EP 9201214 W EP9201214 W EP 9201214W WO 9221757 A1 WO9221757 A1 WO 9221757A1
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07K—PEPTIDES
- C07K14/00—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof
- C07K14/415—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof from plants
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- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
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- 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
- C12N15/8285—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 for nematode resistance
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
- Y02A40/10—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in agriculture
- Y02A40/146—Genetically Modified [GMO] plants, e.g. transgenic plants
Definitions
- This invention relates to nematode-responsiv promoters which can be isolated from plants infected b nematodes and which can either induce (i.e., stimulate) o repress the expression of genes or DNA fragments, unde their control, at least substantially selectively i specific cells (e.g., fixed feeding site, pericycle, endodermis, cortex or vascular cells) of the plants' roots, preferably in cells of the plants 7 fixed feeding sites, i response to the nematode infection.
- i specific cells e.g., fixed feeding site, pericycle, endodermis, cortex or vascular cells
- the nematode-induce promoters of this invention are especially useful i transgenic plants for controlling foreign DNAs that are to be expressed selectively in the specific root cells of the plants, so as to render the plants resistant to nematodes, particularly to sedentary endoparisitic nematodes.
- This invention also relates to a first or nematode- induced chimaeric gene that can be used to transform a cell of a plant and that contains a first foreign gene or DNA fragment that: a) encodes a product which, when expressed in specific cells of the plant's roots, preferably in cells of fixed feeding sites of the plant, can either kill or at least disturb significantly the specific root cells of the plant, preferably the cells of the plant's fixed feeding sites, or kill, disable or repel nematodes feeding at fixed feeding sites; and b) is under the control of a nematode- induced promoter of this invention.
- This invention further relates to a cell of a plant, the genome of which is transformed to contain the first chimaeric gene and optionally a second or restorer chimaeric gene that contains a second promoter controlling a second foreign gene or DNA fragment encoding a product that is expressed so as to inhibit or inactivate the first foreign gene or DNA fragment or the product encoded thereby in cells other than the specific cells of the plant's roots, preferably in cells other than fixed feeding site cells of the plant.
- This invention yet further relates to: a) a nematode- resistant plant (such as tomato or potato) which is regenerated from the plant cell of this invention and is transformed with the first and optionally the second chimaeric genes, b) nematode-resistant plants derived from the regenerated plant and seeds of such plants, and c) plant cell cultures, all of which consist essentially of the transformed plant cells of this invention.
- a nematode- resistant plant such as tomato or potato
- the plants of this invention are characterized by the nematode-induced expression of the first chimaeric gene of this invention in their specific root cells, preferably their fixed feeding site cells, and either a) the substantial, preferably complete, absence of expression of the first chimaeric gene in all other plant cells or b) the substantial absence and preferably the complete absence, by expression of the second chimaeric gene of this invention, of the effects of any expression of the first chimaeric gene in all other plant cells — thereby rendering the plants resistant to nematode infections.
- This invention still further relates to a process of rendering a plant resistant to plant-parasitic nematodes by transforming the plant with the first and optionally the second chimaeric gene(s) of this invention.
- Plant-parasitic nematodes are small (generally 100-3 ⁇ m long but up to 4 mm long, and 15-35 ⁇ m wide) worm-li animals which feed on root, stem or leaf tissues of livi plants. Nematodes are present wherever plants a cultivated.
- Ectoparasitic nematodes such as the dagg (Xiphinema and Lonqidorus spp.), stubby-root (Trichodor and Paratrichodorus spp.) and spiral (Scutellonema a Helicotylenchus spp.) nematodes, live outside the plant a pierce the plant cells with their stylet in order to fee Migratory endoparasitic nematodes, such as the lesi (Pratylenchus spp.), stem and bulb (Ditylenchus spp.) a burrowing (Radopholus spp.) nematodes, live and feed insi the plant, migrating through the plant tissues.
- Sedenta endoparasitic nematodes such as the root-knot (Meloidoqyn spp.), cyst (Globodera and Heterodera spp.), citru (Tylenchulus spp.) and reniform (Rotylenchulus spp. nematodes, live and feed inside the plant, inducin specialized fixed feeding sites called giant cells syncytia or nurse cells in susceptible plants. Such fixe feeding sites serve as food transfer cells for the variou developmental stages of the nematodes. Syncytia originat in the pericycle, endodermis or adjacent cortex (Jones 1981) .
- Parasitic nematodes can cause significant plant yiel losses. The most striking effect of nematode infection is general reduction in plant growth. Nematodes can ac directly as plant pathogens that predispose plants t bacterial or fungal infections or as vectors of plan viruses. Plant diseases caused by nematodes include roo galling, root lesions, root rot, stubby roots, stunting an wilting. Overall average annual yield loss of the world's major crops due to damage by plant-parasitic nematodes is estimated at 12.3 % (Sasser and Freckman, 1987) . Monetary losses, when all crops are considered, exceed US $ 100 billion annually (1984 production figures and prices; Sasser & Freckman, 1987) .
- the ten most significant nematode genera are the ectoparasitic Xiphinema spp., the migratory endoparasitic Pratylenchus spp. , Ditylenchus spp. , Radopholus spp. and Helicotylenchus spp.. , the sedentary endoparasitic Meloidogyne spp., Heterodera spp., Globodera spp. , Tylenchulus spp. and Rotylenchulus spp. (Sasser and Freckman, 1987) .
- cyst nematodes comprising the genera Heterodera, Globodera and Meloidogyne which cause severe damage to many crops and are of major economic importance.
- cyst nematodes e.g., Heterodera and Globodera
- cyst nematodes cause great problems in the production of potatoes, soybeans, sugar beets, and wheat.
- cyst nematodes Once cyst nematodes have infested a field, it is practically impossible to eliminate them.
- Meloidogyne spp. affect many species of plants (over 2,000), including most of the major crops of the world. In the tropics, root-knot is often the limiting factor in crop production.
- cyst nematode infections extensive gall formation accompanies the infection with root-knot nematodes.
- Nematicides used commerciall are generally either fumigants (e.g., halogenated aliphati hydrocarbons and methyl isothiocyanate precursor compo ⁇ nds) or non-fumigants (e.g., organophosphates and oxime- carbamates) .
- fumigants e.g., halogenated aliphati hydrocarbons and methyl isothiocyanate precursor compo ⁇ nds
- non-fumigants e.g., organophosphates and oxime- carbamates
- Nematocides are only efficient under certain agronomical and environmental conditions (Bunt, 1987) , and soil and roots act as barriers, protecting plant-parasitic nematodes from nematicides.
- Nematodes are known to rapidly invade fields, and phytonematodes are easily distributed with soil and plants. As a result, nematode control with nematicides does not persist for long but must be repeated frequently and with relatively high concentrations of nematicides to keep nematode populations at low levels.
- the infective second-stage juveniles of the sedentary endoparasitic nematode species invade the roots and migrate inter- and intra-cellularly through the cortex to specific regions, usually close to the pericycle, within the roots. Once the nematode has traversed the cortex, it can initiate feeding in a cortical cell, but in most cases, feeding is initiated in endodermal or pericyclic cells (Endo, 1987) . Here, the juveniles settle and begin to puncture the cells surrounding heads.
- the juveniles introduce their secretions into these cells which induces changes in the cells, thereby forming fixed feeding sites in which a large volume of cytoplasm is available to the juveniles (Endo, 1987) .
- the growth cycle of fixed feeding sites is directly related to the further development of the nematodes.
- the second-stage juveniles After establishment of fixed feeding sites, the second-stage juveniles increase steadil in size and undergo three moults in quick succession.
- Th third- and fourth-stage juveniles cannot feed, but th young females resume feeding.
- further changes in th cells of the fixed feeding sites are controlled b secretions produced by the females and maintained b removal of cytoplasm by the feeding females.
- Th initiation, development and maintenance of fixed feedin sites is essential for the establishment, development an reproduction of the nematodes.
- the fixed feeding sites ar thus critical for the survival of the sedentar endoparasitic nematodes. Without the fixed feeding sites the nematodes would be unable to feed and reproduce an would die.
- the sedentary endoparasitic nematodes thu illustrate an important principle — that the relationshi between parasite and plant host depends on a continuin exchange of information by the two organisms. When th nematodes are killed, fixed feeding sites degenerate, leading to the conclusion that the maintenance of fixe feeding sites depends on the continued presence of functional parasite. Each of the sedentary phytonematode induces the development of fixed feeding sites upon whic it feeds.
- nematode-responsive cDNA sequences isolated from tomato plants comprising the sequences, SEQ ID no. 1, SEQ ID no. 2, SEQ ID no. 3, SEQ ID no. 4, SEQ ID no. 5, SEQ ID no. 6, SEQ ID no. 7 and SEQ ID no. 8 described in the Sequence Listing.
- nematode-responsive promoters of the tomato genes corresponding to the cDNA sequences of SEQ ID nos. 1-8 particularly: a) nematode-induced promoters of the genes corresponding to the cDNA sequences of SEQ ID nos. 2-8, more particularly of: i) the gene corresponding to the cDNA sequence of SEQ ID no.
- the first or nematode-induced chimaeric gene that comprises the following, operably linked, DNA sequences:
- a nematode-induced promoter that is suitable to direct transcription of a foreign DNA at least substantially selectively, preferably selectively, in the specific root cells, preferably in the cells of fixed feeding sites, of a plant (at whose fixed feeding sites nematodes would feed) ;
- a first foreign DNA that encodes a first RNA and/or protein or polypeptide which, when produced or overproduced in the specific root cells, preferably the cells of the fixed feeding sites, of the plant, either a) kills, disables or repels the nematodes when the nematodes feed from the fixed feeding sites or b) kills the specific root cells, preferably the cells o the fixed feeding sites, or at least disturb significantly their metabolism, functioning and/o development, thereby at least disturbin significantly, and preferably ending, the ability o the nematodes to feed from the fixed feeding sites o the plant; and
- suitable 3' transcription termination signal for expressing the first foreign DNA i the cells of the specific root cells, preferably th fixed feeding sites.
- a cell of a plant in which the nuclear genome is transformed to contain the first chimaeric gene of this invention and preferably, when the nematode-induced promoter directs transcription of the first foreign DNA only substantially selectively in the specific root cells, preferably the fixed feeding site cells, of the plant, to also contain the second or restorer chimaeric gene, preferably in the same genetic locus; the second chimaeric gene comprises the following, operably linked, DNA sequences:
- a second promoter such as a nematode-repressed promoter, which can direct transcription of a foreign DNA in cells of the plant where the first foreign DNA is expressed, preferably at least substantially selectively in cells other than the specific root cells, particularly in cells other than the fixed feeding site cells, of the plant;
- nematode-resistant plant regenerated from the transformed plant cell of this invention, nematode- resistant plants derived therefrom and their seeds, and plant cell cultures, each of which consists essentially of the plant cells of this invention.
- a process for rendering a plant resistant to nematodes comprising the step of transforming the plant's nuclear genome with the first chimaeric gene and optionally the second chimaeric gene of this invention.
- Fixed feeding sites should be understood as specialized feeding sites (such as giant cells, syncytia and nurse cells and, if present, galls) , the formation of which is induced by sedentary endoparasitic nematodes in susceptible plants.
- the plant cells of such sites serve as food transfer cells for the various developmental stages of the nematodes.
- Nematode-infected plant means a plant in which a nematode has entered.
- Giant cells should be understood as the multinucleate plant root cells induced by nematodes such as root-knot nematodes. The multinucleate condition of each giant cell is believed to result from multiple mitosis in the absence of cytokinesis.
- Synchronium refers to multinucleate plant root cells induced by nematodes such as cyst nematodes. The multinucleate condition of each syncytium results from cell wall dissolution between contiguous cells with preexisting nuclei.
- Neurse cells refers to a group of six to ten uninucleated plant root cells, induced by Tylenchulus spp. , which have a dense cytoplasm without a vacuole and a much enlarged nucleus and nucleolus.
- Galls refer to a proliferation of cortical plant cells/tissue induced by nematodes. Typically, giant cells reside within galls.
- Nematode-responsive promoter means a promoter whose action in controlling transcription of a DNA sequence (e.g., gene) in a plant is influenced — that is, either induced (i.e., stimulated) or repressed — by infection of the plant by nematodes and preferably is influenced selectively in specific cells of the plant's roots, particularly in cells of the plant's fixed feeding sites.
- a "nematode-responsive promoter” can be either a "nematode-induced promoter” or a "nematode-repressed promoter”.
- Specific cells of a plant's roots or “specific root cells of a plant” means cells of a root tissue such as the fixed feeding sites, the pericycle, the endodermis, the cortex or the vascular tissue, preferably a) cells of the fixed feeding sites or b) cells of tissue (e.g., pericycle cells) which i) will differentiate into fixed feeding site cells upon infection of the plant by nematodes or ii) can be altered to reduce the ability of nematodes to feed at fixed feeding sites of the plant.
- Particularly preferred specific root cells of a plant are fixed feeding site cells.
- Homologous refers to proteins or nucleic acids having similar sequences of amino acids or nucleotides, respectively, and thus having substantially the same structural and/or functional properties.
- “Expression” means transcription and translation to a product from a DNA encoding the product.
- "Foreign" with regard to a DNA sequence means that such a DNA is not in the same genomic environment (e.g., not operably linked to the same promoter and/or 3' end) in a plant cell, transformed with such a DNA in accordance with this invention, as is such a DNA when it is naturally found in a cell of the plant, bacteria, animal, fungus, virus, or the like, from which such a DNA originates.
- a nematode- resistant plant can be produced from a single cell of a plant by transforming the plant cell in a known manner to stably insert, into its nuclear genome, the first chimaeric gene of this invention which comprises at least one first foreign DNA that is: under the control of, and fused in frame at its upstream (i.e., 5') end to, one of the nematode-induced promoters of this invention; and fused at its downstream (i.e., 3') end to suitable transcription termination (or regulation) signals, including a polyadenylation signal.
- the first RNA and/or protein or polypeptide is produced or overproduced at least predominantly, preferably exclusively, in the specific root cells, preferably cells of the fixed feeding sites, of the plant.
- the plant cell genome can also be stably transformed with the second chimaeric gene, comprising at least one second foreign DNA that is: under the control of, and is fused at its 5' end to, the second promoter which is capable of directing expression of the second foreign DNA in cells of the plant where the first foreign DNA is expressed, preferably substantially selectively in plant cells other than the specific root cells, particularly in cells other than the fixed feeding site cells; and fused at its 3'end to suitable transcription termination signals, including a polyadenylation signal.
- the second chimaeric gene is preferably in the same genetic locus as the first chimaeric gene, so as to guarantee, with a high degree of certainty, the joint segregation of both the first and second chimaeric genes into offspring of the plant regnera ed from the transformed plant cell.
- joint segregation is not desirable, and the second chimaeric gene should be in a different genetic locus from the first chimaeric gene.
- the first foreign DNA controlled by the nematode-induced promoter, encodes a first RNA and/or protein or polypeptide which, when produced or over-produced in the specific root cells, preferably the cells of the fixed feeding sites, of the plant, either: a) kills such cells or at least disturbs significantly their metabolism, functioning and/or development so as to at least disturb significantly, and preferably end, the ability of nematodes to feed from the fixed feeding sites; and/or b) kills, disables or repels any nematode(s) feeding at the fixed feeding sites.
- First foreign DNAs preferably encode, for example, the following which can kill the specific root cells, preferably fixed feeding site cells, or at least disturb significantly their metabolism, functioning and/or development: RNases such as RNase Tl or barnase; DNases such as endonucleases (e.g. EcoRI) ; proteases such as papain; enzymes which catalyze the synthesis of phytohormones, such as isopentenyl transferase or the gene products of gene 1 and gene 2 of the T-DNA of Agrobacterium; glucanases; upases; lipid peroxidases; plant cell wall inhibitors; or toxins such as the A-fragment of diphtheria toxin or botulin.
- RNases such as RNase Tl or barnase
- DNases such as endonucleases (e.g. EcoRI)
- proteases such as papain
- enzymes which catalyze the synthesis of phytohormones such as isopentenyl transferas
- first foreign DNAs are antisense DNAs complementary to genes encoding products essential for the metabolism, functioning and/or development of the specific root cells, preferably the fixed feeding site 15 cells.
- First foreign DNAs preferably encode, for example, the following first polypeptides or proteins which can kill or disable nematodes: the Bacillus thuringiensis toxins described in European patent publication (“EP”) 303426 (which is incorporated herein by reference) , collagenases, chitinases, glucanases, peroxidases, superoxide dismutases, lectins, glycosidases, antibacterial peptides (e.g., magainins, cecropins and apidaecins) , gelatinases, enzyme inhibitors or neurotoxins.
- EP European patent publication
- the first foreign DNA under the control of such a promoter preferably encodes either: a) a material such as callose or lignin which, when produced in the pericycle cells, will make the pericycle substantially impenetrable to nematodes, so as to prevent the nematodes from feeding at the fixed feeding sites or establishing other fixed feeding sites and thereby repel the nematodes from the fixed feeding sites.
- Plants transformed with such a first foreign DNA in a first chimaeric gene of this invention will be resistant to nematode infections either because of a nematode-induced breakdown of their fixed feeding sites, which are essential for the survival of nematodes, or because nematodes, feeding on the fixed feeding sites, will be killed, repelled or disabled by, for example, a nematode toxin produced m situ by their fixed feeding site cells.
- Each of the nematode-induced promoters of this invention which can be used to control expression of the first foreign DNA of this invention substantially exclusively, preferably exclusively, in the specific root cells, particularly fixed feeding site cells, of a plant
- each of the nematode- repressed promoters of this invention which can be used to control expression of the second foreign DNA of this invention predominantly, preferably substantially exclusively, in cells other than the specific root cells, particularly cells other than the fixed feeding site cells of a plant, can be identified and isolated in a well known manner in the specific root cells, particularly the fixed feeding site cells, of the plant.
- a suitable nematode-induced or nematode-repressed promoter can be identified and isolated in one or more plants, preferably two or more plants (e.g. , tomato and potato) , infected with nematodes by the following process steps:
- the nematode-responsive cDNA clones of step 3 of this process can also be isolated by other methods (Hodge et al, 1990) .
- Examples of nematode-responsive promoters, which can be obtained by this process, are the promoters of this invention which can be identified using the cDNAs of SEQ ID nos. 1-8, particularly the nematode-induced promoters which can be identified with the cDNAs of SEQ ID nos. 2-8 and the nematode-repressed promoter which can be identified with the cDNA of SEQ ID no.l.
- the first chimaeric gene causes expression of the first chimaeric gene in all cells of a nematode-infected plant, transformed with the first chimaeric gene, but is believed to cause expression at substantially higher levels in fixed feeding site cells.
- at least certain of the nematode-induced promoters are preferably combined in the first chimaeric gene with a first foreign DNA selected so that its differential expression in the specific root cells, particularly fixed feeding site cells (as compared to the other cells of the infected plant) , has the desired selective effect on the specific root cells, preferably the fixed feeding site cells.
- Other promoters of this invention such as those which can be identified by means of the cDNA sequences of SEQ ID no. 4 and SEQ ID no. 6, cause expression of the first foreign DNA predominantly in pericycle cells.
- the nematode-induced promoter in the first chimaeric gene of this invention is not 100% specific for the specific root cells, preferably the fixed feeding site cells, of a plant transformed therewith, it is preferred that the plant be further transformed so that its nuclear genome contains, stably integrated therein, the second chimaeric gene of this invention.
- the second promoter of the second chimaeric gene is selected so that it is capable of directing transcription of the second foreign DNA to provide sufficiently high expression levels of the second RNA or protein or polypeptide to inhibit or preferably inactivate the first RNA or protein or polypeptide in all plant cells, with the exception of the specific root cells, preferably the fixed feeding site cells.
- second promoter is a nematode-repressed promoter of this invention, such as the promoter of the gene which can be identified with the cDNA of SEQ ID no. 1.
- second promoters are: the strong constitutive 35S promoters of the cauliflower mosaic virus of isolates CM 1841 (Gardner et al, 1981), CabbB-S (Franck et al, 1980) and CabbB-JI (Hull and Howell, 1987); and the TR1' and TR2' promoters which drive the expression of the 1' and 2' genes, respectively, of the T-DNA (Velten et al, 1984) .
- a second promoter can be utilized which is specific for one or more plant tissues or organs, such as roots, whereby the second chimaeric gene is expressed only in cells of the specific tissue(s) or organ(s) .
- a promoter whose expression is inducible (e.g., by temperature or chemical factors).
- the second chimaeric gene be under the control of a gall- specific promoter.
- the second foreign DNA controlled by the second promoter, encodes a second RNA and/or protein or polypeptide which, when produced or overproduced in cells of a plant, inhibits or preferably inactivates the first RNA, protein or polypeptide in such cells.
- Second foreign DNAs preferably encode, for example, the following: barstar which neutralizes the activity of barnase (which degrades RNA molecules by hydrolyzing the bond after any guanine residue) ; EcoRI methylase which would prevent the activity of the endonuclease EcoRI; or a protease inhibitor which would neutralize the activity of a protease, such as papain (e.g., papain zymogen and papain active protein) .
- Another preferred example of a second foreign DNA is a DNA which encodes a strand of antisense RNA which would be complementary to a strand of sense first RNA.
- 3' transcription termination signals or 3'ends can be selected from among those which are capable of providing correct transcription termination and polyadenylation of mRNA in plant cells.
- the transcription termination signals can be the natural ones of the first and second foreign DNAs, to be transcribed, or can be foreign. Examples of foreign 3' transcription termination signals are those of the octopine synthase gene (Gielen et al, 1984) and of the T-DNA gene 7 (Velten and Schell, 1985) .
- the cell of a plant can be transformed using a vector that is a disarmed Ti-plasmid containing the first chimaeric gene and optionally the second chimaeric gene of this invention and carried by Agrobacterium.
- This transformation can be carried out using the procedures described, for example, in EP 116,718 (29 August 1984), EP 270,822 (15 June 1988) and Gould et al (1991) [which are also incorporated herein by reference] .
- Preferred Ti- plasmid vectors contain the foreign DNA sequences between the border sequences, or at least located to the left of the right border sequence, of the T-DNA of the Ti-plasmid.
- vectors can be used to transform the plant cell, using procedures such as direct gene transfer (as described, for example, in EP 233,247), pollen-mediated transformation (as described, for example, in EP 270,356, PCT publication WO 85/01856, and US patent 4,684,611), plant RNA virus-mediated transformation (as described, for example, in EP 67,553 and US patent 4,407,956) and liposome-mediated transformation (as described, for example, in US patent 4,536,475).
- direct gene transfer as described, for example, in EP 233,247
- pollen-mediated transformation as described, for example, in EP 270,356, PCT publication WO 85/01856, and US patent 4,684,611
- plant RNA virus-mediated transformation as described, for example, in EP 67,553 and US patent 4,407,956
- liposome-mediated transformation as described, for example, in US patent 4,536,475).
- the plant to be transformed is corn, rice or another monocot
- more recently developed methods be used such as, for example, the methods described for certain lines of corn by Fromm et al (1990) and Gordon-Kamm et al (1990) , the methods described for rice by Datta et al (1990) and Shimamoto et al (1989) and the more recently described method for transforming monocots generally of PCT patent application no. PCT/EP 9102198.
- the first and second chimaeric genes of this invention are preferably inserted in the same genetic locus in the plant genome. Therefore, it is preferred that the first and second chimaeric genes be transferred to the plant genome as a single piece of DNA, so as to lead to their insertion in a single locus in the genome of the plant.
- plants containing the two chimaeric genes can also be obtained in the following ways:
- the chimaeric genes can be separately transferred to the nuclear genomes of separate plants in independent transformation events and can subsequently be combined in a single plant genome through crosses. 2.
- the chimaeric genes can be separately transferred to the genome of a single plant in the same transformation procedure, leading to the insertion of the respective chimaeric genes at multiple loci (cotransformation) .
- One of the two chimaeric genes can be transferred to the genome of a plant already transformed with the other chimaeric gene.
- the resulting transformed plant can be used in a conventional breeding scheme to produce more transformed plants with the same characteristics or to introduce the first chimaeric gene and optionally the second chimaeric gene in other varieties of the same or related plant species.
- Seeds obtained from the transformed plants contain the chimaeric gene(s) of this invention as a stable genomic insert.
- Marmande were each grown at 20° C in industrial pots under semi-sterile conditions in a 1:1 sand:soil mixture, which was sterilized by irradiation and watered daily with a filtered sterilized nutrient solution (Cooper, 1976) .
- Plants were infected by inoculation with' about 6,000
- Poly (A) + RNA was isolated by oligo - dT cellulose affinity chromatography as described by Slater (1984).
- cDNA was synthesized using the cDNA synthesis system plus (Amersham Intl. PLC, Buckinghamshire, England).
- the cDNA library was constructed in plasmid pUC19 (Yanisch-Perron et al, 1985) which was electroporated in E. coli.
- About 3,000 randomly selected clones were individually grown in the wells of' microtiter plates containing LB medium (Miller, 1972) supplemented with 100 /.g/rol ampicillin.
- Replicas of .the sublibrary were made with a replica block on Hybond N nylon membranes (Amersham) which were further treated according to Sambrook et al (1989) .
- First strand cDNAs reverse transcribed from total RNA of root-knots and of control roots, were used as probes for differential screening. To this end, reproducible replicas of 3,000 individual cDNA clones were hybridized overnight at 68"C with 32 P-labeled probes. Subsequently, the hybridization patterns obtained with cDNA probes from root-knots were compared to those obtained with cDNA probes from control roots. Ninety-three (93) clones gave a stronger hybridization signal with the "infected" probes than with the "control" probes. These clones were labeled as "nematode-stimulated” or "nematode-induced” clones and were subjected to a second screening.
- LEMMI Low-density lipoprotein
- LEMMI 4 Low-density lipoprotein
- LEMMI 6 LEMMI 7
- LEMMI 8 LEMMI 9.
- LEMMI 10 and LEMMI 11 The following cDNA clone showed a nematode- repressed hybridization pattern: LEMMI 1.
- Cross- hybridization performed under high stringency conditions showed that LEMMI 6 and LEMMI 9 most likely correspond to the same mRNA.
- LEMMI 8 and LEMMI 11 appeared to be an extensin. Southern blot analysis of tomato DNA performed under high stringency conditions proved the plant origin of these clones. Since root-knots contain nematodes, some of the nematode-stimulated clones could have been from nematode origin. Southern blot and northern blot analysis further showed that LEMMI 4 and LEMMI 8 belong to different multigene families. The differential hybridization patterns of the cDNA clones were confirmed by Northern blot analysis.
- Potato plants (Solanum tuberosu cv Bintje) were infected by inoculation with the potato cyst nematode, Globodera pallida. Infected and control plants were grown under identical conditions. Eight weeks after inoculation, infected roots were harvested, and RNA was prepared as described in Example 1. 5 ⁇ g of poly (A) + RNA was used as a starting material for the construction of a cDNA library.
- a cDNA library of 40,000 recombinant clones was obtained after ligation in the plasmid vector pUC18 (Norrander et al, 1983) and electroporation in E. coli. 3,700 of these clones were isolated and grown in microtiter wells. Subsequently, these clones were subjected to a differential screening procedure as described in Example 1 to identify nematode-repressed cDNAs and nematode-stimulated cDNAs of potato.
- Explants consisting of an internode and a leaf were cut off tobacco plants. The explants were then put into Petri dishes (13.5 cm diameter) which contain the normal culture medium used for SRI tobacco plants. The explants started rooting after about 5 to 7 days. After 10 days, the roots were infected in the following way: the culture medium is carefully lifted and a solution containing approximately 1000-2000 nematode larvae (2nd larval instar) is added.
- This in vitro system had several advantages, including the synchronicity of the infection, the easy scoring and the possibility of stage-specific observations. Several pathogen-induced and pathogenesis-related proteins were tested using this system. A very strong induction of extensin (8-fold higher than in control roots) was observed.
- EXAMPLE 4 ISOLATION OF NEMATODE-RESPONSIVE GENES CORRESPONDING TO THE NEMATODE-RESPONSIVE CDNA CLONES OF EXAMPLES 1 AND 2
- genomic DNA clones carrying the regulatory sequences of the genes corresponding to the selected cDNA clones of Examples 1 and 2 a genomic library is constructed. To this end, total genomic DNA of tomato is digested with a tetra-cutter restriction enzyme in order to obtain approximately 20 kb DNA fragments. These genomic DNA fragments are then cloned in the phage vector, Charon 35 (Rimm et al, 1980) .
- the nematode-responsive cDNAs of Examples 1 and 2 are used as probes for screening the library. Genomic clones, which hybridize to the probes, are selected and sequenced. Comparison of the sequences from the cDNA clones of this invention with those of the genomic clones leads to the identification of the homologous regions. At the 5' end of the homologous region of each genomic clone, the ATG translation initiation codon and TATA consensus sequence are identified in order to locate the nematode-responsive promoter region. The fact that the "TATA-box" is part of the promoter region is confirmed by primer extension.
- the 5' regulatory sequences, including the nematode- responsive promoter, of each of the nematode-responsive genes of Example 4 are subcloned into the polylinker of pMAC 5-8 (EPA 87402348.4). This produces vectors which can be used to isolate single stranded DNA for use in site- directed mutagenesis.
- the promoter cassettes of Example 5 are used to construct plant transformation vectors comprising first chimaeric genes of this invention, each of which contains the 5' regulatory sequences, including the nematode- responsive promoter, of one of the nematode-responsive genes isolated in Example 4.
- Each of these 5' regulatory sequences is upstream of, is in the same transcriptional unit as, and controls a first foreign DNA (from EPA 89401194.9) encoding barnase from Bacillus amylolicruefaciens (Hartley and Rogerson, 1972) .
- Each chimaeric gene Downstream of the first foreign DNA is the 3' end of the octopine synthase gene (Gielen et al, 1984) .
- Each chimaeric gene also comprises the 35 S'3 promoter (Hull and Howell, 1987) fused in frame with the neo gene encoding kanamycin resistance (EPA 84900782.8), as a marker, and the 3' end of the octopine synthase gene.
- each vector is inserted between the T-DNA border sequences of a Ti-plasmid carried by Agrobacterium (EPA 89401194.9 and EPA 90402281.1).
- the vectors from Example 6 are each mobilized into Agrobacterium tumefaciens C58C1 Rif R containing pMP90 (Koncz and Schell, 1986).
- the resulting recombinant Agrobacterium strains are used to transform tomato leaf discs using the standard procedures described in EPA 87400544.0.
- the resulting recombined Agrobacterium strains are also used to transform potato plants (Solanum tuberosum cv. Bintje) by means of tuber disc infection as described by Deblock et al (1987) .
- Transformed calli are selected on a substrate containing 100 / .g/ml kanamycin, and resistant calli are regenerated into plants.
- the use of the nematode-responsive promoters of this invention is not limited to the transformation of any specific plant(s) .
- Such promoters can be useful in transforming any crop, such as rapeseed, alfalfa, corn, cotton, sugar beets, brassica vegetables, tomato, potato, soybeans, wheat or tobacco where the promoters can control gene expression, preferably where such expression is to occur abundantly in specific root cells, preferably in fixed feeding site cells.
- the use of the nematode-responsive promoters of this invention is not limited to the control of particular foreign DNAs but can be used to control expression of any gene or DNA fragment in a plant.
- this invention is not limited to the specific nematode-responsive, preferably nematode-induced, promoters described in the foregoing Examples. Rather, this invention encompasses promoters equivalent to those of the Examples which can be used to control the expression of a structural gene, such as a first foreign DNA, at least substantially selectively in specific root cells, preferably fixed feeding site cells, of a plant. Indeed, it is believed that ' the DNA sequences of the promoters of the Examples can be modified by replacing some of their codons with other codons, provided that such modifications do not alter substantially the ability of polymerase complexes, including transcription activators, of specific root cells, particularly fixed feeding site cells, to recognize the promoters, as modified.
- APPLICANT PLANT GENETIC SYSTEM N.V.
- ii) TITLE OF INVENTION Nematode-Responsive Plant Promoters
- ADDRESSEE Plant Genetic Systems N.V.
- MOLECULAR TYPE cDNA to mRNA
- MISCELLANEOUS cDNA desinated as LEMMI 1
- CTGTCTGCCA AAAAACCACC AACACTGTCA CTTGCCACAA GGCGAATGAG 350
- MOLECULAR TYPE CDNA to mRNA
- MOLECULAR TYPE cDNA to mRNA
- Nucleotide 65 to 88 cloning adaptor sequence
- MOLECULAR TYPE cDNA to mRNA
- Nucleotide 9 to 32 cloning adaptor sequence
- Nucleotide 33 to 482 putative Open Reading Frame ('ORF')
- MISCELLANEOUS cDNA designated as LEMMI 7
- MOLECULAR TYPE CDNA to mRNA
- nucleotides 1878 to 2434 constitute nematode- responsive cDNA PROPERTIES : Nematode-responsive cDNA MISCELLANEOUS : cDNA designated as LEMMI 8
- ATTAAGAA7C TTTTATCTAG GAAGTAATAT TATACTCTTA TTAGCTCATG 700
- AAACACTTTA ATATATAAAC ACTGTTCTCA AAACTAAAAT AATAATAAAT 800
- ACTTTTTG3C CAAAAAAGTT TTAAAATAAG TCAAAAGTCG AATGTAGGGT 1250
- GCTCATCCAA ACAGGCCCTT GTTCATTTAT ACCTCCCTAA AGATCTTTGA 1350
- CTCCTCCCTA CCATTACTAA GAAGTGAGTT TACTATATCT GAGGAAAAGC 2150
- MOLECULAR TYPE cDNA to mRNA
- AAAAAAAAAA AA ⁇ CCATGGT ACCCGGATCC TCGAATTCAC TGGCCGTCGT 950
- MOLECULAR TYPE cDNA to mRNA
- MOLECULAR TYPE cDNA to mRNA
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Abstract
Description
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WO1993010251A1 (en) * | 1991-11-20 | 1993-05-27 | Mogen International N.V. | A method for obtaining plants with reduced susceptibility to plant-parasitic nematodes |
WO1993018170A1 (en) * | 1992-03-13 | 1993-09-16 | Advanced Technologies (Cambridge) Ltd. | Root knot nematode resistance |
WO1994010320A1 (en) * | 1992-11-02 | 1994-05-11 | Mogen International N.V. | Plants with reduced susceptibility to plant-parasitic nematodes |
WO1994017194A1 (en) * | 1993-01-21 | 1994-08-04 | North Carolina State University | Nematode-resistant transgenic plants |
EP0612208A1 (en) * | 1991-10-04 | 1994-08-31 | North Carolina State University | Pathogen-resistant transgenic plants |
WO1995030017A1 (en) * | 1994-04-29 | 1995-11-09 | Unilever Plc | Improvements in or relating to disease-resistance of plants |
WO1996026283A1 (en) * | 1995-02-21 | 1996-08-29 | Plant Genetic Systems, N.V. | Method to obtain male-sterile plants |
US5612471A (en) * | 1994-05-25 | 1997-03-18 | The Regents Of The University Of California | Nematode-induced genes in tomato |
WO1997020057A1 (en) * | 1995-11-29 | 1997-06-05 | University Of Leeds | Root specific promoters |
WO1997046692A1 (en) * | 1996-06-04 | 1997-12-11 | Mogen International N.V. | Nematode-inducible plant gene promoter |
WO1998022599A1 (en) * | 1996-11-18 | 1998-05-28 | Mogen International N.V. | Nematode-inducible regulatory dna sequences |
US5859332A (en) * | 1992-03-20 | 1999-01-12 | Max-Planck-Gesellschaft Zur Forderung | Fungus-responsive chimaeric gene |
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US6140554A (en) * | 1997-03-27 | 2000-10-31 | Advanced Technologies (Cambridge) Limited | Specificity of gene expression |
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