CN102286401A - Rice endotrophic azotobacter for producing activated calcium carbonate (ACC) and realizing antagonistic effect on fusarium graminearum and purpose thereof - Google Patents

Rice endotrophic azotobacter for producing activated calcium carbonate (ACC) and realizing antagonistic effect on fusarium graminearum and purpose thereof Download PDF

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CN102286401A
CN102286401A CN2011101976510A CN201110197651A CN102286401A CN 102286401 A CN102286401 A CN 102286401A CN 2011101976510 A CN2011101976510 A CN 2011101976510A CN 201110197651 A CN201110197651 A CN 201110197651A CN 102286401 A CN102286401 A CN 102286401A
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microbial inoculum
gdsd125
cgmcc
burkholderia
bulkholderia cepasea
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孙建光
徐晶
高淼
胡海燕
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Institute of Agricultural Resources and Regional Planning of CAAS
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Abstract

The invention discloses a rice endotrophic azotobacter for producing activated calcium carbonate (ACC) and realizing the antagonistic effect on fusarium graminearum and a purpose thereof. The rice endotrophic azotobacter is Burkholderia sp. GDSD125 and has the preservation number being CGMCC No.5038 in General Microbiology Center of China Microbial Strain Preservation Management Committee. The Burkholderia sp. GDSD125 CGMCC No.5038 provided by the invention has high nitrogen fixation activity and ACC ammonialyase activity, can realize the effective antagonistic effect on gibberella zeae and has wide application prospects in nitrogen fixation microbial agent and microbial organic fertilizer production.

Description

Interior growing nitrogen-fixing bacterium of paddy rice of acc deaminase and antagonism gibberellic hypha and uses thereof is produced in one strain
Technical field
The present invention relates to a strain and produce growing nitrogen-fixing bacterium and uses thereof in the paddy rice of acc deaminase and antagonism gibberellic hypha, particularly a strain can produce acc deaminase, antagonism crop gibberellic hypha, and has the bacterium that carries out the high-efficiency nitrogen-fixing function in the paddy rice body.
Background technology
Nitrogenous fertilizer is one of most important production means in the agriculture production.Produce a large amount of energy of chemical nitrogen fertilizer consumption, account for 70%～80% of total production cost.Energy day is becoming tight in recent years, and China's chemical fertilizers production soars with the coal price lattice and causes the chemical nitrogen fertilizer price increase, and the peasant is difficult to bear, and repercussion is strong.In addition, chemical nitrogen fertilizer is being brought into play huge effect aspect raising crop yield, the guarantee China grain security, but the unreasonable nitrogen of executing has formed serious pollution of area source, causes a series of serious harm, makes us startling as Taihu Lake blue-green algae incident.The urban groundwater azotate pollution has caused threat to drinking water safety.
Contain 78% nitrogen in the atmosphere, but its existence form is a molecular state nitrogen, animals and plants can not directly utilize, and nature has only some prokaryotic micro-organisms to have the ability of directly utilizing nitrogen in the atmosphere, with its reduction ammonification, biological nitrogen fixation that Here it is.Select for use the batch production of high-efficiency nitrogen-fixing microorganism bacterial classification to produce and make microbial inoculum, or further become biological products with other material Compound Machining that is rich in plant nutrition, be applied to agriculture production, crop nitrogen nutrition can be provided, improve the crop rhizosphere ecotope, improve the soil organisms fertility property, Here it is usually said nitrogen-fixing microorganism microbial inoculum or nitrogen-fixing microorganism fertilizer.Biological nitrogen fertilizer has multiple advantage: 1. biological nitrogen fertilizer is made up of reproducible biochemical preparation and living microorganism, can regenerate, and does not have the resource exhaustion problem, is the Sustainable development agricultural material product.2. biological nitrogen fertilizer is an environmental friendly fertilizer, and it is produced and use does not all produce pollutants such as the three wastes, and can improve soil physico-chemical property, increase soil fertility, and be ecological agriculture agricultural material product.3. biological nitrogen fertilizer production power consumption less, cost is low, and its cost only is 20%～40% of an equivalent chemical nitrogen fertilizer, can save a large amount of coal and oil equal energy source strategic materials for country.4. use biological nitrogen fertilizer can significantly reduce agriculture production cost, improve quality of agricultural product, promote soil fertility, the peasant is benefited, development promotes social harmony.
The pathogenic bacteria of crop head blight is that Gibberella zeae bacterium (Gibberella zeae) asexual generation is Fusarium graminearum (Fusarium graminearum), is the important pathogenic bacteria of food crop.China's wheat scab has 95% to be that Gibberella zeae (Sch.) Petch is microbial, is the important disease in winter wheat district, the middle and lower reach of Yangtze River and northeast spring wheat district, often causes 20%～30% production loss during morbidity.In addition, this bacterium is also infected crops such as corn, paddy rice, barley, causes that seedling is withered, stem rot, base corruption, fringe corruption etc.The control to head blight at present mainly relies on chemical pesticide, however chemical prevention not only cost height, contaminate environment, and also preventive effect is also undesirable, and the security of food is simultaneously also had a strong impact on.
Bacterial classification is the basis of microbial fertilizer production application.At present, the bottleneck of restriction China microbial fertilizer industry development is exactly the seed selection problem of high-efficiency strain.Agriculture production active demand nitrogen fixation efficiency height, antagonism pathogenic fungi, strong stress resistance, the long microbial fertilizer production bacterial classification of shelf-lives.
Summary of the invention
The purpose of this invention is to provide a strain and have 1-amino-cyclopropane-1-carboxylic acid (ACC) deaminase active, can in the paddy rice body, carry out high-efficiency nitrogen-fixing, and the bacterium of antagonism Gibberella zeae bacterium (Gibberella zeae).
Bacterium provided by the invention is bulkholderia cepasea (Burkholderia sp.) GDSD125, and the deposit number of this bacterial strain at China Committee for Culture Collection of Microorganisms common micro-organisms center is CGMCC No.5038.
Another object of the present invention provides a kind of microbial inoculum, and the activeconstituents of this microbial inoculum is described bulkholderia cepasea (Burkholderia sp.) GDSD125 CGMCC No.5038.
This microbial inoculum also can comprise auxiliary material, as the stalk of the ight soil of the peat composed of rotten mosses, animal, all kinds of crops, loose shell, straw, peanut skin etc. except that bulkholderia cepasea (Burkholderia sp.) the GDSD125 CGMCC No.5038 that comprises as activeconstituents.
This microbial inoculum can be used for suppressing pathogenic fungi, control fungal diseases of plants, fixed nitrogen, promotion plant-growth, suppress plant produce ethene, reduce plant to adverse circumstance susceptibility, improve stress resistance of plant, produce 1-amino-cyclopropane-1-carboxylic acid (ACC) desaminase and nitrogenase etc.
Described bulkholderia cepasea (Burkholderia sp.) GDSD125 CGMCC No.5038 is in preparation following 1)-9) in application in the arbitrary microbial inoculum also belong to protection scope of the present invention:
1) is used to suppress the microbial inoculum of pathogenic fungi;
2) be used to prevent and treat the microbial inoculum of fungal diseases of plants;
3) be used for the microbial inoculum of fixed nitrogen;
4) microbial inoculum of promotion plant-growth;
5) suppress the microbial inoculum that plant produces ethene;
6) reduce the microbial inoculum of plant to adverse circumstance susceptibility;
7) microbial inoculum of raising stress resistance of plant;
8) microbial inoculum of generation 1-amino-cyclopropane-1-carboxylic acid (ACC) desaminase;
9) microbial inoculum of generation nitrogenase.
Described pathogenic fungi can be by soil, the fertilizer in being manured into soil and/or the fungi of seed dispersal, specifically can be the fungi that causes head blight; Described fungal diseases of plants is a head blight; Described adverse circumstance is arid, waterflooding, high temperature, physical abuse, disease and pest invasion and attack or heavy metal contamination etc.
Describedly cause that the fungi of head blight specifically can be Gibberella zeae bacterium (Gibberella zeae).
Described bulkholderia cepasea (Burkholderia sp.) GDSD125 CGMCC No.5038 or be that the microbial inoculum of activeconstituents is used in producing nitrogenase or 1-Aminocyclopropane-1-carboxylate deaminase and the application in the preparation biological organic fertilizer also belongs to protection scope of the present invention with bulkholderia cepasea (Burkholderia sp.) GDSD125 CGMCC No.5038.
Another object of the present invention provides and a kind ofly contains described bulkholderia cepasea (Burkholderia sp.) GDSD125 CGMCC No.5038 or be the biological organic fertilizer of the microbial inoculum of activeconstituents with described bulkholderia cepasea (Burkholderia sp.) GDSD125 CGMCC No.5038.
Another purpose of the present invention provides the method for a kind of cultivation bulkholderia cepasea (Burkholderia sp.) GDSD125 CGMCC No.5038, comprises the step that bulkholderia cepasea (Burkholderia sp.) GDSD125 CGMCC No.5038 is cultivated at the substratum that is used for cultivating bulkholderia cepasea.
Another purpose of the present invention provides a kind of method for preparing described microbial inoculum, and this method comprises the steps: described bulkholderia cepasea (Burkholderia sp.) GDSD125 CGMCC No.5038 to obtain described microbial inoculum as activeconstituents.
Experimental results show that, the present invention is the high-efficiency nitrogen-fixing bacterium GDSD125 that separates from rice plant, this bacterial strain can produce 1-amino-cyclopropane-1-carboxylic acid (ACC) desaminase, and nitrogenase activity is very high, can antagonism crop head blight pathogenic bacteria Gibberella zeae bacterium (Gibberella zeae), the competition adaptive faculty is strong, and effect of inoculation is good, has broad application prospects in nitrogen-fixing microorganism microbial inoculum and biological organic fertilizer production.
The preservation explanation
Strain name: bulkholderia cepasea
Latin name: (Burkholderia sp.)
Strain number: GDSD125
Preservation mechanism: China Committee for Culture Collection of Microorganisms common micro-organisms center
Preservation mechanism is called for short: CGMCC
Address: No. 3, Yard 1, BeiChen xi Road, Chaoyang District, Beijing City
Preservation date: on July 6th, 2011
The preservation center numbering of registering on the books: CGMCC No.5038
Description of drawings
Fig. 1 is the nitrogenase activity of bulkholderia cepasea (Burkholderia sp.) GDSD125 CGMCC No.5038.
Fig. 2 is bulkholderia cepasea (Burkholderia sp.) GDSD125 CGMCC No.5038 antagonism gibberellic hypha Gibberella zeae bacterium (Gibberella zeae).The left side bacterium colony is gibberellic hypha Gibberella zeae bacterium (Gibberella zeae), and the right side bacterium colony is bulkholderia cepasea (Burkholderia sp.) GDSD125 CGMCC No.5038.
Fig. 3 is the acc deaminase activity of bulkholderia cepasea (Burkholderia sp.) GDSD125 CGMCC No.5038.
Embodiment
Employed experimental technique is ordinary method if no special instructions among the following embodiment.
Used material, reagent etc. if no special instructions, all can obtain from commercial channels among the following embodiment.
Many carbon sources are hanged down nitrogen substratum (CCM): solution I: KH 2PO 40.2g, NaCl 0.1g, K 2HPO 40.8g, Na 2FeEDTA 28mg, Sodium orthomolybdate 25mg, yeast extract 100mg, N.F,USP MANNITOL 5g, sucrose 5g, Sodium.alpha.-hydroxypropionate 0.5mL, distilled water 900mL.Solution II: MgSO 47H 2O 0.2g, CaCl 22H 2O 0.06g, distilled water 100mL.Solution I, II are sterilized respectively, be cooled to about 50 ℃ and mix, add vitamin H (5 μ g/L) and each 0.5mL of VITAMIN (10 μ g/L).
Nitrogen-free agar: sucrose 10g, NaCl 0.12g, K 2HPO 43H 2O 0.5g, CaCO 31g, MgSO 47H 2O 0.2g, distilled water 1000mL, pH7.2.
DF substratum: KH 2PO 44.0g, Na 2HPO 46.0g, MgSO 47H 2O 0.2g, glucose 2.0g, Sunmorl N 60S 2.0g, citric acid 2.0g, (NH 4) 2SO 42.0g, component one, each 0.1ml of component two solution, H 2O 1000mL, pH 7.2; Wherein component one: H 3BO 310mg, MnSO 4H 2O 11.19mg, ZnSO 47H 2O 124.6mg, CuSO 45H 2O 78.22mg, MoO 310mg is dissolved in the 100mL sterile purified water; Component two: FeSO 47H 2O 100mg is dissolved in the 10mL sterile purified water.
The ADF substratum: ACC (1-amino-cyclopropane-1-carboxylic acid) is dissolved in ultrapure water, and filtration sterilization is added to and does not contain (NH 4) 2SO 4Sterilization DF substratum in, final concentration is 3.0mM.
Improvement fixed nitrogen substratum: sucrose 10g, K 2HPO 43H 2O 0.5g, NaCl 0.2g, CaCO 31g, MgSO 47H 2O 0.2g, yeast extract paste 0.5g, distilled water 1000ml, agar 1.5%～2.0%, pH 7.0～7.2.
Azotobacter chroococcum (Azotobacter chroococcum) ACCC11103 (referring to " Sun Jianguang etc. screening of high-efficiency nitrogen-fixing genus bacillus and biological characteristics thereof. Scientia Agricultura Sinica, 2009,42 (6): 2043-2051 ").
Gibberellic hypha-Gibberella zeae bacterium (Gibberella zeae) (Chinese agriculture microbial strains preservation administrative center, ACCC31053).
Separation and the evaluation of growing nitrogen-fixing bacterium GDSD125 in embodiment 1, the paddy rice
One, the separation of growing nitrogen-fixing bacterium in the paddy rice
The isolating concrete operations of growing nitrogen-fixing bacterium are as follows in the paddy rice: get fresh water rice plants (picking up from Heilongjiang Province of China), at first rinse well with tap water, use 70% alcohol immersion 1min then successively, 2% clorox surface sterilization sterilization 10min, aseptic water washing 3 times.Under the aseptic technique, accurately take by weighing sample 10.0g, in aseptic mortar, wear into pasty state, shift, be settled to 100ml, continue dilution and make series of diluted samples, respectively from 10 -4, 10 -5, 10 -6Get 0.1ml in the diluent and be uniformly coated on respectively on above-mentioned CCM substratum and the nitrogen-free agar flat board, be inverted for 28 ℃ and cultivate, behind 3～4d, picking list bacterium colony line purifying obtains growing nitrogen-fixing bacterium in the paddy rice.Last washing water are coated on to detect on the beef-protein medium and confirm the sterilization of plant sample thoroughly during simultaneously, with surface sterilization.
Two, acc deaminase positive strain screening
Growing nitrogen-fixing bacterium in the paddy rice of step 1 gained is carried out the screening of acc deaminase positive strain, and concrete grammar is as described below: the interior growing nitrogen-fixing bacterium that is separated to, insert in the 5mL liquid nitrogen-free agar 30 ℃, 200r/min shaking culture 24h; Draw above-mentioned nutrient solution 0.1mL and be seeded to 5mL DF substratum shaking culture 24h; Draw above-mentioned nutrient solution 0.1mL and be seeded to shaking culture 24～48h in the 5mL ADF substratum; The bacterial classification that to grow in ADF repeats switching, cultivates, and with the ADF substratum as negative control, can be that the bacterial strain of only nitrogen source growth is the acc deaminase positive strain with ACC.With growing nitrogen-fixing bacterium GDSD125 in the strain acc deaminase positive strain called after paddy rice of screening gained.
Three, the evaluation of growing nitrogen-fixing bacterium GDSD125 in the paddy rice
Also screen growing nitrogen-fixing bacterium GDSD125 in the paddy rice that obtains from the following aspects authentication step one and two separation and purification:
1, morphology is identified
To be in logarithmic phase, and the bacterium colony size is stable, the vinelandii GDSD125 that above-mentioned steps one is separated and purifying obtains carries out single bacterium colony state description, mainly comprises size, color, transparency, wettability, bacterium colony condition of surface (whether smooth, projection, fold, depression etc.), the colony edge state (whether neat, irregular, radial etc.) of bacterium colony.
For the described vinelandii GDSD125 that is in logarithmic phase, behind smear staining, adopt the form of observation by light microscope thalline.
The result shows, the circular umbilical projection of the vinelandii GDSD125 bacterium colony that above-mentioned steps one is separated and purifying obtains, and oyster white, glossy, smooth surface is moistening, neat in edge; The thalline oval, 0.5 * 1.0 μ m, Gram-negative.
2, analysis of physio biochemical characteristics
With reference to " common bacteria system identification handbook " (eastern elegant pearl, Cai Miaoying. common bacteria system identification handbook. Beijing: Science Press, 2011.) and " microbiology experiment " (Shen Ping, Fan Xiurong, Li Guangwu. microbiology experiment (third edition). Beijing: Higher Education Publishing House, 1999.) measure the physiological and biochemical property of above-mentioned vinelandii GDSD125.
The physiological and biochemical property measurement result of described vinelandii GDSD125 is as shown in table 1:
The physiological and biochemical property of table 1 vinelandii GDSD125
Figure BDA0000075928560000051
Figure BDA0000075928560000061
Annotate: "+" expression is positive, and "-" expression is negative.
3,16s rDNA sequence homology analysis
Ordinary method is cultivated the vinelandii GDSD125 that above-mentioned steps one and two separation and purification and screening obtain, the total DNA that extracts bacterial strain is as the gene amplification template, with bacterium 16s rDNA universal primer, 27f:5 '-AGAGTTTGATCCTGGCTCAG-3 ', 1492r:5 '-TACGGTTACCTTGTTACGACTT-3 ' carry out the PCR reaction.Reaction system adopts Shanghai biotechnology company limited pcr amplification test kit.Response procedures is: 95 ℃ of sex change 30s, 55 ℃ of annealing 1min, 72 ℃ of extensions 2min, totally 30 circulations.Dna sequencing is finished by Beijing three rich polygala root biotech companies, sequence assembly and similarity analysis use DNAStar software to finish, and sequence alignment is by online the finishing of American National biotechnology information center ncbi database (http://www.ncbi.nlm.nih.gov).
The sequence of growing nitrogen-fixing bacterium GDSD125 bacterial strain 16s rDNA sees sequence 1 in the sequence table for details in the paddy rice.
4, growth characteristics analysis
Bacterial strain optimum temperuture and optimal pH growth experiment have been carried out.Adopt nitrogen-free agar, at the thermal adaptability of 4 ℃, 28 ℃, 37 ℃, 60 ℃ cultivations, observation, record bacterial strain, each is handled 3 times and repeats respectively.Adjust acidity and be respectively pH3, pH4, pH5, pH6, pH7, pH8, pH9, pH10, pH11, each is handled 3 times and repeats, the optimal pH of cultivation, observation, record strain growth.
The result shows that the optimum growth temperature of growing nitrogen-fixing bacterium GDSD125 is 28 ℃ in the described paddy rice, and the suitableeest growth pH is pH7～8.
In view of above-mentioned form, analysis of physio biochemical characteristics and 16s rDNA sequence homology analysis result, growing nitrogen-fixing bacterium GDSD125 is accredited as modification bacterium β subgroup bulkholderia cepasea section bulkholderia cepasea and belongs to (Burkholderia sp.) in the paddy rice that step 1 and two separation and purification and screening are obtained.This bulkholderia cepasea (Burkholderia sp.) GDSD125 is preserved in China Committee for Culture Collection of Microorganisms common micro-organisms center on July 6th, 2011 and (is called for short CGMCC, the address is: No. 3, Yard 1, BeiChen xi Road, Chaoyang District, Beijing City), deposit number is CGMCC No.5038.
Embodiment 2, bulkholderia cepasea (Burkholderia sp.) GDSD125 CGMCC No.5038 nitrogenase activity determination
Embodiment 1 resulting bulkholderia cepasea (Burkholderia sp.) GDSD125 CGMCC No.5038 is carried out nitrogenase activity determination, concrete grammar is as described below: add 5ml improvement fixed nitrogen substratum bevel in 15 * 150mm screw socket Glass tubing, the inoculation vinelandii, 28 ℃ of cultivations.With the positive contrast of microbial fertilizer production commonly used bacterial classification azotobacter chroococcum (Azotobacter chroococcum) ACCC11103, do not inoculate the negative contrast in blank inclined-plane, establish 3 repetitions.After cultivating 72h, change rubber plug, it is 10% that the injection acetylene gas makes final concentration, with the medical proof fabric sealing, continues to cultivate 72h, gets 100 μ l reactant gasess, with gas chromatograph for determination ethene growing amount, according to the nitrogenase activity of following formula calculating bacterial strain.Nitrogenase activity (nmol/mgh)=C 2H 4Nmol/[tropina amount (mg) * reaction times (h)], C wherein 2H 4Nmol=1000 * C 2H 4Volume (μ l) * 273 * P/[22.4 * (273+t) * 760], wherein P is air pressure (a mm mercury column), t be temperature of reaction (℃).
Wherein, the tropina content assaying method is as described below: with 5ml physiological saline the lawn on the test tube slant is washed in the centrifuge tube, collect thalline, the NaOH boiling water that adds 3ml 0.5M in precipitation boils 5min, and the HCl that adds 3ml 0.5M mixes, and gets supernatant 1.0ml after centrifugal, add 5ml Xylene Brilliant Cyanine G solution, on eddy mixer, mix colour developing 3min, the light absorption value A at mensuration 595nm place 595, calculate tropina content according to the bovine serum albumin typical curve.
The result shows that the nitrogenase activity of the bulkholderia cepasea that screens (Burkholderia sp.) GDSD125 CGMCC No.5038 is 56.521nmol C 2H 4/ hmg albumen, statistical study are significantly higher than the microbial fertilizer nitrogenase activity 25.100nmol/hmg albumen of producing bacterial classification azotobacter chroococcum ACCC11103 commonly used, as shown in Figure 1.This result shows that bulkholderia cepasea of the present invention (Burkholderia sp.) GDSD125 CGMCC No.5038 can high-efficiency nitrogen-fixing.
Embodiment 3, bulkholderia cepasea (Burkholderia sp.) GDSD125 CGMCC No.5038 antagonism pathogenic fungi bacteriostasis rate are measured
Adopting 2 face-off methods that embodiment 1 resulting bulkholderia cepasea (Burkholderia sp.) GDSD125 CGMCC No.5038 is carried out antagonism pathogenic fungi bacteriostasis rate measures, concrete operations are as described below: inoculate crop pathogenic fungi Gibberella zeae bacterium (Gibberella zeae) and bulkholderia cepasea (Burkholderia sp.) GDSD125 CGMCC No.5038 on 2 of distance center 2cm on the PDA flat board respectively, 3 repetitions of each Screening Treatment are contrast only to connect the flat board that pathogenic fungi do not meet bulkholderia cepasea (Burkholderia sp.) GDSD125 CGMCC No.5038.28 ℃ of constant temperature culture are measured the dull and stereotyped colony radius r that goes up pathogenic fungi along tested bulkholderia cepasea (Burkholderia sp.) GDSD125 CGMCC No.5038 direction of face-off with the millimeter graduated scale behind the 15d 1, and the dull and stereotyped colony radius r that goes up pathogenic fungi of contrast 0Pathogenic fungi growth inhibition ratio (%)=(contrast radius r 0Pathogenic fungi colony radius r is cultivated in-face-off 1)/contrast radius r 0* 100%.
The result shows, the r of gibberellic hypha (Gibberella zeae) 0Be 63.3 ± 2.8mm, r 1Be 30.0 ± 1.8mm.Mean value is calculated for the above-mentioned formula of people: described bulkholderia cepasea (Burkholderia sp.) GDSD125 CGMCC No.5038 is 52.61% to the bacteriostasis rate of Gibberella zeae bacterium (Gibberella zeae), as shown in Figure 2.This result shows effectively antagonism Gibberella zeae bacterium (Gibberella zeae) of described bulkholderia cepasea (Burkholderia sp.) GDSD125 CGMCC No.5038.
Embodiment 4, bulkholderia cepasea (Burkholderia sp.) GDSD125 CGMCC No.5038 1-amino-cyclopropane-1-carboxylic acid (ACC) deaminase activity determination
Embodiment 1 resulting bulkholderia cepasea (Burkholderia sp.) GDSD125 CGMCC No.5038 is carried out the acc deaminase determination of activity, concrete grammar is as described below: ACCC11103 organizes in contrast with azotobacter chroococcum (Azotobacter chroococcum), and bulkholderia cepasea (Burkholderia sp.) the GDSD125 CGMCC No.5038 of embodiment 1 screening gained is as experimental group.Do not have nitrogen liquid nutrient medium activation bacterial strain with 5ml, draw the 0.5ml nutrient solution and be inoculated in the 60ml nutrient solution, cultivate 24～48h for 30 ℃, 4 ℃, the centrifugal 10min collection of 8000rpm thalline do not contain (NH with 15ml 4) 2SO 4DF liquid nutrient medium centrifuge washing thalline 2 times, thalline is resuspended in the 24ml ADF substratum, cultivate 24h for 30 ℃, collect also record thalline weight.With 0.1M Tris-HCl damping fluid (pH 7.6) centrifuge washing thalline 2 times, with the thalline average mark in 3 EP pipes ,-20 ℃ of storages.Get the storage thalline and be resuspended in 1ml 0.1M Tris-HCl damping fluid (pH 7.6), the centrifugal 5min of 12000rmp collects thalline, be resuspended in the 600 μ l 0.1M Tris-HCl damping fluids (pH 8.5), add 30 μ l toluene, vibration 30s smudge cells is got 4 ℃ of storages of 100 μ l crude enzyme liquids and is used to measure protein concentration rapidly; All the other crude enzyme liquids carry out the acc deaminase determination of activity.Get crude enzyme liquid 200 μ l, add the ACC solution mixing that 20 μ l concentration are 0.5M, place 30 ℃ of water-bath 15min, add 1ml 0.56M HCl termination reaction, the centrifugal 5min of 12000rmp gets supernatant 1ml, adds 800 μ l 0.56M HCl and 300 μ l 0.2%2,4-dinitrobenzene hydrazine solution (dissolving among the 2M HCl), 30 ℃ of insulation 30min; Add 2ml 2M NaOH mixing, 540nm surveys absorbance.Contrast α-ketone butyric acid typical curve and protein determination typical curve calculate the enzymic activity of bacterial strain.The acc deaminase method for expressing is: under the reaction conditions, every milligram of tropina per hour catalysis ACC deamination forms micromole's number of α-batanone acid, and unit is (μ mol α-batanone acid/hmg albumen).Protein determination adopts colorimetry, with bovine serum albumin as standard substance.Measurement result is 3 repetition mean values.
The result shows, the acc deaminase activity of described bulkholderia cepasea (Burkholderia sp.) GDSD125 CGMCC No.5038 is 3.591 μ mol α-batanone acid/hmg albumen, far above the enzymic activity of control group azotobacter chroococcum (Azotobacter chroococcum) ACCC11103, as shown in Figure 3.This result shows, described bulkholderia cepasea (Burkholderia sp.) GDSD125 CGMCC No.5038 has the acc deaminase activity, and then can improve the potential that crop is resisted adverse environmental factors such as arid, waterflooding, high temperature, physical abuse, disease and pest invasion and attack or heavy metal contamination.
Figure IDA0000075928670000011

Claims (10)

1. bulkholderia cepasea (Burkholderia sp.) GDSD125, its deposit number at China Committee for Culture Collection of Microorganisms common micro-organisms center is CGMCC No.5038.
2. microbial inoculum, its activeconstituents is the described bulkholderia cepasea of claim 1 (Burkholderia sp.) GDSD125 CGMCC No.5038.
3. microbial inoculum according to claim 2 is characterized in that: described microbial inoculum is following 1)-9) in arbitrary microbial inoculum:
1) is used to suppress the microbial inoculum of pathogenic fungi;
2) be used to prevent and treat the microbial inoculum of fungal diseases of plants;
3) be used for the microbial inoculum of fixed nitrogen;
4) microbial inoculum of promotion plant-growth;
5) suppress the microbial inoculum that plant produces ethene;
6) reduce the microbial inoculum of plant to adverse circumstance susceptibility;
7) microbial inoculum of raising stress resistance of plant;
8) microbial inoculum of generation 1-Aminocyclopropane-1-carboxylate deaminase;
9) microbial inoculum of generation nitrogenase.
4. the described bulkholderia cepasea of claim 1 (Burkholderia sp.) GDSD125 CGMCC No.5038 is in preparation following 1)-9) in application in the arbitrary microbial inoculum:
1) is used to suppress the microbial inoculum of pathogenic fungi;
2) be used to prevent and treat the microbial inoculum of fungal diseases of plants;
3) be used for the microbial inoculum of fixed nitrogen;
4) microbial inoculum of promotion plant-growth;
5) suppress the microbial inoculum that plant produces ethene;
6) reduce the microbial inoculum of plant to adverse circumstance susceptibility;
7) microbial inoculum of raising stress resistance of plant;
8) microbial inoculum of generation 1-Aminocyclopropane-1-carboxylate deaminase;
9) microbial inoculum of generation nitrogenase.
5. microbial inoculum according to claim 3 or the described application of claim 4 is characterized in that: described pathogenic fungi is the fungi that causes head blight; Described fungal diseases of plants is a head blight; Described adverse circumstance is arid, waterflooding, high temperature, physical abuse, disease and pest invasion and attack or heavy metal contamination.
6. microbial inoculum according to claim 5 or application is characterized in that: describedly cause that the fungi of head blight is Gibberella zeae bacterium (Gibberella zeae).
7. the described bulkholderia cepasea of claim 1 (Burkholderia sp.) GDSD125 CGMCC No.5038 or claim 2,3,5 or 6 described microbial inoculums are used in producing nitrogenase or 1-Aminocyclopropane-1-carboxylate deaminase; Or,
The described bulkholderia cepasea of claim 1 (Burkholderia sp.) GDSD125 CGMCC No.5038 or claim 2,3, the application of 5 or 6 described microbial inoculums in the preparation biological organic fertilizer.
8. the biological organic fertilizer that contains the described bulkholderia cepasea of claim 1 (Burkholderia sp.) GDSD125 CGMCC No.5038 or claim 2,3,5 or 6 described microbial inoculums.
9. cultivate the method for the described bulkholderia cepasea of claim 1 (Burkholderia sp.) GDSD125 CGMCC No.5038, comprise the step that bulkholderia cepasea (Burkholderia sp.) GDSD125 CGMCC No.5038 is cultivated at the substratum that is used for cultivating bulkholderia cepasea.
10. the preparation method of claim 2,3,5 or 6 described microbial inoculums comprises the steps: the described bulkholderia cepasea of claim 1 (Burkholderia sp.) GDSD125 CGMCC No.5038 to obtain described microbial inoculum as activeconstituents.
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CN115851495A (en) * 2022-09-07 2023-03-28 西北农林科技大学 Biocontrol bacterium for preventing and treating wheat scab, application of biocontrol bacterium and biocontrol bacterium agent
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