CN100999716A - High toxicity bacillus thuringiensis mutant strain D1-23 of high producting Zwittermicin A and crystal protein and application thereof - Google Patents
High toxicity bacillus thuringiensis mutant strain D1-23 of high producting Zwittermicin A and crystal protein and application thereof Download PDFInfo
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Abstract
The present invention belongs to the field of microbial pesticide preparing technology, and is especially breeding process of one high virulence Bacillus thuringiensis mutant capable of generating Zwittermicin A and crystallin in high yield. The Bacillus thuringiensis mutant D1-23 in the preservation number of CCTCC No. M206064 is bred with YBT-1520 strain of the present inventor as initial strain and through ultraviolet and diethyl sulfate mutagenesis. Biological control application of the corresponding preparation shows that the fermented liquid has average beet noctuid LC50 of 0.266 microliter/mL, average potency on cotton bollworm of 6053 IU/ microliter, average yield of Zwittermicin A in 163 units/mL, and average crystallin yield of 5.91 mg/mL. The present invention can lower the production and use cost of Bacillus thuringiensis, raise its pesticidal virulence and expand its pesticidal spectrum.
Description
Technical field
The invention belongs to the microbial pesticide technical field, be specifically related to screening and the application of a kind of Tribactur mutant strain.
Background technology
Tribactur is to use the most successful microbial pesticide at present, furtherd investigate by people for many years, but it is to be solved to still have many problems to have.As: the Tribactur insecticidal crystal protein is all in the resistance that has caused insect in varying degrees, different insect effects there is higher specificity, many important Agricultural pests are insensitive to the Tribactur toxin, and existing goods strain insect disinfestations spectrum is narrow, engineering strain inherited character instability, each class pest is to the continuous generation of existing cry gene resistance, and all will become influences the conditionality factor that Tribactur is further successfully applied.
Beet armyworm is a kind of universal important crop pests, 100 various plants such as the beet of causing harm, peanut, soybean, corn, cotton.The Bacillus thuringiensis bacterial strain of report has higher specificity to different insects at present, but it is more insensitive to noctuidae pests such as beet armyworms, therefore separation screening is the focus of our times various countries Tribactur research to the active new Bacillus thuringiensis bacterial strain of the high virulence of beet armyworm.
There is data to show, economic benefits and social benefits rhzomorph (Zwittermicin A) is a kind of amino polyol class microbiotic, self to the toxicity of insect extremely a little less than, but can significantly improve the insecticidal activity of Tribactur Kustak subspecies bacterial strain to beet armyworm, its synergism can reach hundred times, can delay the resistance of insect to the Bt sterilant simultaneously.General Tribactur is lower to the toxicity of insects such as Noctuidae beet armyworm, but bollworm had good insecticidal effect, therefore obtain the Tribactur of high yield Zwittermicin A, to strengthening its insecticidal toxicity to noctuidae pests such as beet armyworms, widen insecticidal spectrum, the effect that improves the Bt sterilant is significant.
In recent years, also there are some investigators to adopt the traditional physical chemistry mutagenesis or the method for molecular biology rite-directed mutagenesis, with bacillus thuringiensis mutant strain (Outtrup et al., 2001 of agar plate diffusion process screening high yield Zwittermicin A; Outtrupet al., 2005; Elizabeth et al., 2004), but this method efficient is low, working strength is big, and also uneconomical, therefore press for the bacillus thuringiensis mutant strain of setting up new efficient screening model and obtaining above-mentioned objective trait.
Summary of the invention
The objective of the invention is to overcome the defective of prior art, technical problem to be solved is to utilize existing genetic breeding means, obtains a kind of high yield Zwittermicin A and insecticidal crystal protein and noctuid is had the bacillus thuringiensis mutant strain and the application in preparation thuringiensis praeparatum preparation and cultural control thereof of high virulence.
The present invention is achieved through the following technical solutions:
Contriver screening obtains a strain can high yield Zwittermicin A and crystallin and the Tribactur plant mutant strain that noctuid had high virulence, be named as D1-23, this mutant strain is a kind of Tribactur Bacillusthuringiensis, be deposited in Chinese typical culture collection center (CCTCC) on July 5th, 2006, its preserving number is CCTCC NO:M206064.And utilize this bacterial strain to obtain high yield Zwittermicin A and crystallin crystal by deep layer fermenting process, obtain thuringiensis praeparatum preparation by preparation production, and then be used for Strategies of Agricultural Bio-control, for example the control of noctuid.
Starting strain of the present invention is the patent of invention bacterial strain Tribactur YBT-1520 that adopts the applicant to authorize, this bacterial strain belong to a strain to the Bacillus thuringiensis bacterial strain of the high virulence of bollworm (referring to the Chinese invention patent specification sheets, the patent No. is ZL95106749.4), by ultraviolet ray and ethyl sulfate selection by mutation, adopt the screening model of foundation to select high yield Zwittermicin A and crystallin and to the mutant strain D1-23 of the high virulence of noctuid.The applicant is applied to the zymotechnique of high yield Zwittermicin A and crystallin with this bacterial strain, develops high-efficiency broad spectrum Tribactur microbial inoculum of new generation.
Below the invention will be further described:
The present invention comes seed selection beet armyworm to be had the mutant strain of high virulence by setting up following screening model, utilize Tribactur YBT-1520 bacterial strain (referring to Chinese invention patent, ZL 95106749.4) be starting strain, carry out selection by mutation by ultraviolet ray (UV) and ethyl sulfate (DES), just sift out the mutant strain of high yield Zwittermicin A and crystallin with the dull and stereotyped big flux screening method of agar block, then high yield Zwittermicin A mutant strain is carried out shake flask fermentation, further sieve again by the content of measuring its crystallin and Zwittermicin A, carry out estimation of biological potency by the mutant strain to high yield Zwittermicin A and crystallin at last, screening obtains a strain has high virulence to Noctuidae bacillus thuringiensis mutant strain D1-23.Concrete seed selection step is as follows:
(1) adopting patented strain YBt-1520 (patent No.: ZL 95106749.4) is starting strain, and this bacterial strain has high virulence insecticidal activity to bollworm;
(2) ultraviolet ray (UV) mutagenesis: the YBt-1520 inoculation is cultivated 6-8h to general LB liquid nutrient medium, the centrifugal 15min of 3000rpm abandons supernatant, makes bacteria suspension, and adjusting cell concn is 10
8Individual/mL, as pending bacterium liquid, getting the above-mentioned bacterium liquid of 5mL is added in the sterile petri dish of diameter 11cm, and put into aseptic magnetic stirring apparatus, at 15W, 254nm ultraviolet lamp 30cm shines at the place 0,0.5,1,2,3 respectively, 5min, gets bacterium liquid that 1mL shone and be added in the test tube that 4mL LB liquid nutrient medium is housed and activate under red light, wrap lucifuge with black cloth, in 30 ℃, 180rpm constant temperature shaking table, cultivate 2h;
(3) ethyl sulfate (DES) mutagenesis: the mutant strain that obtains through ultraviolet mutagenesis of step (2) is cultivated 6-8h at the LB liquid nutrient medium, and the centrifugal 15min of 3000rpm abandons supernatant, makes bacteria suspension, makes every milliliter of bacteria suspension contain 10 approximately
8Individual Tribactur spore, get the 25mM sodium phosphate buffer that the above-mentioned bacteria suspension of 4mL adds 16mL pH7.0, the DES ethanolic soln (final concentration of DES is 0.01g/mL) that adds 5mL 5% again, the hypo solution termination reaction that adds 0.5mL25% respectively behind concussion processing 20,40, the 60min, get 1mL mutagenesis bacterium liquid and be added to be equipped with in the 4mL LB liquid nutrient medium test tube and activate, in 30 ℃, 180rpm constant temperature shaking table, cultivate 2h;
(4) with the dilution of the activation bacteria suspension after the mutagenesis, be coated on H
8On solid medium (composition of the substratum as described later) flat board, the concentration of bacteria suspension dilution is controlled at 30～50 of every ware colony numbers.Cultivated one day for 30 ℃, when treating just to grow needle point sample bacterium colony, with the punch tool of internal diameter 6mm, the mutant strain of picking sudden change mortality ratio on the flat board more than 80% takes out together with following agar, transfers in the aseptic blank plate;
(5) with 2～3 days bacterium colony of 30 ℃ of constant temperature culture, transfer to 1/20 TSA (referring to Silo-Suh reported method in 1994 together with agar block, Biological activities of two fungistatic antibiotics produced by Bacillus cereusUW85.Ph.D.thesis.University of Wisconsin-Madison, Madison) on the level(l)ing plate, cultivate 24h in 28 ℃, pick out antibacterial circle diameter obviously greater than the bacterial strain of starting strain;
(6) select antibacterial circle diameter obviously to adopt H greater than the bacterial strain of starting strain inhibition zone
8Liquid nutrient medium carries out shake flask fermentation and sieves again.Measure the content of crystallin and Zwittermicin A, selecting all high bacterial strain of both content is for the examination insect with the beet armyworm, carries out estimation of biological potency, choosing to beet armyworm the bacterial strain of high virulence be defined as the efficient mutant strain of wanting required for the present invention;
(7) H
8The solid culture based formulas is: W-Gum 20 grams per liters, soybean cake powder 20 grams per liters, corn steep liquor 10 grams per liters, industrial peptone 5 grams per liters, yeast powder 2 grams per liters, CaCO
31-2 grams per liter, agar 20 grams per liters, all the other are water.According to the ordinary method sterilization of report, transferring pH before the sterilization is 8.0.
(8) H
8The liquid culture based formulas is: W-Gum 20 grams per liters, soybean cake powder 20 grams per liters, corn steep liquor 10 grams per liters, industrial peptone 5 grams per liters, yeast powder 2 grams per liters, CaCO
3The 1-2 grams per liter, all the other are water, according to the ordinary method sterilization of report, transferring pH before the sterilization is 8.0.
(9) 1/20 TSA culture medium prescriptions are: Tryptones 0.85g, soy peptone 0.15g, NaCl 0.25g, glucose 0.125g, KH
2PO
40.125g, agar 15g, make up water by the ordinary method sterilization of report, is transferred pH7.0～7.2 to 1000mL before the sterilization.
The bacillus thuringiensis mutant strain D1-23 that utilizes the present invention to obtain, method according to the conventional liq submerged fermentation of Tribactur is carried out fermentative production microbial pesticide product, and carry out the thuringiensis praeparatum preparation (or claim microbial inoculum) of preparation production different dosage form according to reported method, carried out the control of field control beet armyworm and bollworm and used.
The biology of D1-23 bacterial strain and hereditary property are described:
Biological property: thalline direct rod shape, nourishing body is chain or Dan Sheng, long 3-5 micron, wide 1-1.2 micron, Gram-positive, gemma is cylindric or sub-elliptical, and end is given birth to partially, and sporangium is not expanded, bacterium colony circle on beef-protein medium, edge-smoothing, the plentiful wax shape that is of lawn, growth temperature 10-45 ℃, optimum growth temperature 26-32 ℃, appropriate pH 6.5-7.5, facultative suspicion oxygen is grown in containing the beef peptone substratum of 7%NaCl, at ribose, glucose, fructose, produce acid in maltose and the Zulkovsky starch substratum, the clark and Lubsreaction positive, parasporal crystal is long, wide all than the parasporal crystal increase by 32% of YBT-1520, be two pyramids.In fermentation culture, can vigorous growth in the substratum that with multiple agricultural byproducts is raw material, produce a large amount of parasporal crystals and Zwittermicin A, to the toxicity evaluation of bollworm between 4000 IU/mg-6000IU/mg, to beet armyworm LC
50Be 0.2-4 μ L/mL.
Genetics characteristic: D1-23 bacterial strain flagellar antigen serotype is H3ab, and parasporal crystal is made up of 130KDa and 65KDa crystallin.
The preservation of D1-23 bacterial strain: the D1-23 bacterial strain can be in 30 ℃ of cultivations on the LB medium slant.Can under 4 ℃, make short term storage.If long-term preservation is proper with freeze pipe or preservation of sand tube bacterial strain according to ordinary method.
The D1-23 bacterial strain is in the application (be usually said preparation production) of preparation in the thuringiensis praeparatum preparation, can carry out with reference to the schedule of operation of the applicant's previous patent (patent No. is ZL 01128475.7), and concrete steps are as follows:
(1) preserving number CCTCC NO:M206064 bacterial strain D1-23 is inoculated on the LB test tube slant substratum, activated in 24 hours, transfer then, cultivated 48～72 hours for 30 ℃, be to produce and use slant strains in eggplant bottle inclined-plane in 30 ℃ of cultivations;
(2) seed liquor is cultivated: the cultured eggplant bottle of step (1) slant strains is inoculated in the LB liquid nutrient medium, in 30 ℃, cultivated under the 200-250rpm condition 6～8 hours, insert fermentor cultivation with 0.5～1% inoculum size then;
(3) press fermentor tank volume 60-80% and drop into the substratum shown in the step (6), adopt conventional high pressure steam sterilization,, stir under the 200-250rpm condition promptly at 121 ℃, keep sterilization in 30 minutes, be cooled to after 30-33 ℃ by fermentor tank 0.5～1% of the volume that feeds intake and move into seed liquor;
(4) fermentor cultivation: at temperature 28-32 ℃, tank pressure 0.3-0.8kg/cm
2, air flow 1: 0.4-1: 1.2 (V/V) stir under the 200-250rpm condition and cultivated 26-36 hour, have the sporangium of 20-40% to break with microscopy, just can put jar;
(5) fermentation control: before sterilization, transfer fermentation tank culture medium about pH to 7.5-9.0; The pH value of substratum is reached about 6.5-7.5, make brood cell's germination rate reach the highest.PH drops to 6.0-6.5 after thalline begins to grow, about the pH value 7.5-8.5 when putting jar of ging up again subsequently.Ventilation: the general requirement ventilation flow rate reaches 1: 0.4 to 1: 1.4 (V/V) during the fermentation, and ferment tank 6～8 hours keeps its air flow to be: 1: 1-1: 1.4 (V/V).At any time check temperature value, controlled temperature changes at 30 ± 2 ℃;
(6) the fermentor cultivation based formulas is: by weight/and volume percent meter: soybean cake powder 3.5-5.0% (soybean cake powder needed the 80-100 mesh sieve), W-Gum 2.0-4.0% (adding 0.0025g commodity α-Dian Fenmei in every gram W-Gum), yeast powder 0.1-1.0%, corn steep liquor 1.0-3.0%, peptone 0.3-0.5%, KH
2PO
40.1-2.0%, bubble enemy 0.05-0.1%, according to the ordinary method sterilization, pH is adjusted to 7.5-9.0 before the sterilization, and sterilization back pH is adjusted to 6.5-7.5.
Positively effect of the present invention is:
Compared with the prior art, the present invention has set up a kind of Zwittermicin A of breeding high-yield rapidly and efficiently and crystallin and to the screening model of the Tribactur of the high virulence of noctuid.Adopt this seed selection model, a week can seed selection 1000 surplus the plant mutant strain, and traditional bioassay method seed selection less than 50 strains have improved breeding efficiency greatly, have reduced workload.The applicant's seed selection obtains high yield Zwittermicin A and crystallin and to a series of bacterial strains of the high virulence of noctuid, compare with original starting strain, Zwittermicin A output has improved 2-3 doubly, the biological assay of noctuid beet armyworm and bollworm is tired improved 100%-300% and 10%-20% respectively.
Through test, high yield Zwittermicin A of the present invention and crystallin and can reduce the production and the field control cost of insecticide Bacillus thuringiensis greatly to the application of the Tribactur D1-23 bacterial strain of the high virulence of noctuid delay the generation of pest resistance.
Description of drawings
Fig. 1: be technological line figure of the present invention.
Embodiment
Starting strain of the present invention is selected from the YBT-1520 bacterial strain (bacterium source is the ZL95106749.4 Chinese invention patent referring to the patent No.) that bollworm is had high virulence, carries out selection by mutation by ultraviolet ray and ethyl sulfate (DES).The seed selection model (see figure 1) rapidly and efficiently that adopts applicant oneself to set up, system's detection has been carried out in strain to plant mutant more than 26000, obtains plant height product Zwittermicin A and crystallin and to the mutant strain D1-23 (table 1) of the high virulence of beet armyworm.
Concrete screening step is as follows:
(1) adopt patented strain YBt-1520 (patent No. the is ZL95106749.4) bacterial strain that sets out, this bacterial strain has high virulence activity to bollworm;
(2) ultraviolet mutagenesis: the YBt-1520 bacterial strain is cultivated 6-8h at the LB liquid nutrient medium, and the centrifugal 15min of 3000rpm abandons supernatant, makes bacteria suspension, and adjusting cell concn is 10
8Individual/mL, as pending bacterium liquid, getting 5mL is added in the sterile petri dish of diameter 11cm, and put into aseptic magnetic stirring apparatus, 15W, 254nm ultraviolet lamp 30cm shine at the place 0,0.5,1,2,3 respectively, 5min, get 1mL irradiation bacterium liquid and be added in the test tube that 4mL LB substratum is housed and activate under red light, wrap lucifuge with black cloth, cultivate 2h in 30 ℃, 180rpm constant temperature shaking table;
(3) with the dilution of the activation bacteria suspension after step (2) mutagenesis, be coated on H
8Solid medium (W-Gum 20 grams, soybean cake powder 20 grams, corn steep liquor 10 grams, industrial peptone 5 grams, yeast powder 2 grams, CaCO
31-2 gram, agar 20 grams, make up water to 1 liter, according to the ordinary method sterilization of report, transferring pH before the sterilization is 8.0) on the flat board, the bacteria suspension weaker concn is controlled at 30～50 of the about colony numbers of every ware.Cultivated one day for 30 ℃, when treating just to grow needle point sample bacterium colony, with the punch tool of internal diameter 6mm, totally 3345 strains of the picking sudden change mutant strain of mortality ratio on the flat board more than 80% are taken out together with following agar, transfer in the aseptic blank plate;
(4), transfer on the 1/20 TSA level(l)ing plate together with agar block and (to include Tryptones 0.85g, soy peptone 0.15g, NaCl 0.25g, glucose 0.125g, KH with 3 days bacterium colony of 30 ℃ of constant temperature culture
2PO
40.125g agar 15g, make up water is to 1000mL, according to the ordinary method sterilization, transferring pH before the sterilization is 7.0～7.2), cultivate 24h in 28 ℃, pick out antibacterial circle diameter obviously greater than bacterial strain totally 95 strains of starting strain;
(5) antibacterial circle diameter in the step (4) is obviously adopted H greater than 95 strain bacterial strains of starting strain
8Liquid nutrient medium (W-Gum 20 grams, soybean cake powder 20 grams, corn steep liquor 10 grams, industrial peptone 5 grams, yeast powder 2 grams, CaCO
31-2 gram, make up water to 1 liter, according to the ordinary method sterilization of report, transferring pH before the sterilization is 8.0) carry out shake flask fermentation and sieve again.Measure the content of crystallin and Zwittermicin A, the bacterial strain that both content are all high is for the examination insect with the beet armyworm, carry out estimation of biological potency, primary election obtains the beet armyworm Tribactur candidate strain of high virulence, this candidate strain is named as BtU3-17, carries out next step ethyl sulfate mutagenesis.
(6) ethyl sulfate mutagenesis: the BtU3-17 bacterial strain that step (5) obtains is cultivated 6-8h at the LB liquid nutrient medium, and the centrifugal 15min of 3000rpm abandons supernatant, makes bacteria suspension, makes every milliliter of bacteria suspension contain Tribactur 10 approximately
8Individual, get the above-mentioned bacteria suspension of 4mL and add 16mL pH7.0 25mM sodium phosphate buffer, the DES ethanolic soln (final concentration that makes DES is 0.01g/mL) that adds 5mL5% again, the hypo solution termination reaction that adds 0.5mL25% respectively behind concussion processing 20,40, the 60min, the bacterium liquid of getting 1mL mutagenesis is added in the test tube that 4mL LB substratum is housed and activates, and cultivates 2h in 30 ℃, 180rpm constant temperature shaking table;
(7) with the dilution of the activation bacteria suspension after step (6) mutagenesis, be coated on H
8Solid medium (W-Gum 20 gram, soybean cake powder 20 grams, corn steep liquor 10 grams, industrial peptone 5 grams, yeast powder 2 grams, CaCO
31-2 gram, agar 20 grams, make up water to 1 liter, according to the ordinary method sterilization of report, transferring pH before the sterilization is 8.0) flat board on, the bacteria suspension weaker concn is controlled at about 30～50 of every ware colony number.In 30 ℃ of cultivations one day, when treating just to grow needle point sample bacterium colony, with the punch tool of internal diameter 6mm, mutant strain 2541 strains of picking sudden change mortality ratio on the flat board more than 80% were taken out together with following agar, transfer in the aseptic blank plate; 30 ℃ of constant temperature culture 3 days are transferred to agar block on the 1/20 TSA level(l)ing plate, cultivate 24h for 28 ℃, pick out antibacterial circle diameter and obviously amount to 121 strains greater than the bacterial strain of starting strain;
(8) with antibacterial circle diameter obviously greater than starting strain totally 121 strain bacterial strains adopt H
8Liquid nutrient medium carries out shake flask fermentation and sieves again.Measure the content of crystallin and Zwittermicin A, the bacterial strain that both content are all high is for the examination insect with the beet armyworm, carries out estimation of biological potency, and seed selection is to the beet armyworm bacterial strain D1-23 of high virulence.
Table 1 mutagenesis of the present invention and the screening obtain high yield Zwittermicin A and crystallin mutant strain
| Step | Mutafacient system a | Starting strain | Mutant strain survival number | The dull and stereotyped big flux primary dcreening operation mutant strain number of agar block b | Shake flask fermentation sieves the mutant strain number again | Seed selection obtains the supper toxic strain of |
| 1 2 | UV DES | YBT-1520 BtU3-17 | 15450 11340 | 3345 2541 | 95 121 | BtU3-17 D1-23 |
aDES: ethyl sulfate method; UV: ultraviolet method
bSelect the mutant strain of sudden change mortality ratio on the flat board more than 80%.
Embodiment 2
D1-23 bacterial strain of the present invention and control strain YBT-1520 are applied to 100L ferment tank technological test
Adopt general deep liquid fermentation process (referring to Chinese invention patent ZL 95106749.4), concrete steps are as follows:
One, the preparation of bacterial classification:
1, test is adopted bacterial strain D1-23 of the present invention and granted patent bacterial strain YBT-1520 respectively with bacterial classification, and inoculation compares test respectively on the substratum after the preparation;
2, the preparation of slant strains:
The preparation of slant medium: slant medium is the LB substratum.With this substratum branch pack into test tube or eggplant bottle, according to the ordinary method sterilization of report, treat after the sterilization that temperature is reduced to about 50 ℃ to put into the inclined-plane that if temperature is too high, water of condensation is many, the inclined-plane can be put 37 ℃ and cultivate one day, and is stand-by.
The cultivation of slant strains: above-mentioned D1-23 bacterial strain and YBT-1520 bacterial strain are inoculated in respectively on the test tube slant substratum of the above-mentioned bacterium of going out, cultivate 24 hours (activation) in 30 ℃, transfer then in eggplant bottle inclined-plane, cultivated 72 hours for 30 ℃, the visual inspection lawn is plentiful, surperficial oyster white, no plaque, microscopic examination does not have assorted bacterium, and 90% above bacillus exfoliation can be used for producing, and preserves in refrigerator with slant strains for production and is no more than a week at most.
Two, the foundation of zymotechnique
1) seed liquor is cultivated: above-mentioned cultured eggplant bottle slant strains is inoculated in the LB liquid nutrient medium, in 30 ℃, cultivated under the 200-250rpm condition 6～8 hours, then with 1% inoculum size access fermentor cultivation;
2) press fermentor tank volume 70% and drop into fermentation tank culture medium, this substratum stirs under the 200-250rpm condition according to the ordinary method sterilization of report, keeps sterilization in 30 minutes, is cooled to after 30-33 ℃ and moves into seed liquor by 1% of the volume that feeds intake;
3) fermentor cultivation based formulas: the amount according to every 70L adds following component and amount: soybean cake powder 3150g, W-Gum 2800g (adding 0.0025g commodity α-Dian Fenmei/every gram W-Gum), yeast powder 210g, corn steep liquor 1750g, peptone 350g, KH
2PO
4700g, bubble enemy 35ml, surplus is a water, and soybean cake powder needed the 80-100 mesh sieve, and pH is 8.0 before the sterilization, and sterilization back pH is 7.10.
3) fermentation culture: press fermentor tank volume 70% and drop into substratum (3 prescription set by step), the ordinary method sterilization according to report is cooled to after 30-33 ℃ and moves into seed liquor by 1% of the volume that feeds intake.At temperature 28-32 ℃, air flow 1: 0.4-1: 1.2 (V/V) stir under the 200-250rpm condition and cultivated 26-36 hour, have brood cell's capsule of 20-40% to break with microscopy, just can put jar.
4) fermentation control: the pH before the fermentation tank culture medium sterilization is transferred to about 8.0; PH value after the sterilization is 7.10, and pH drops to 6.0-6.5 after thalline begins to grow, about the pH value 7.5-8.5 when putting jar of ging up again subsequently.Ventilation: the general requirement ventilation flow rate reaches 1: 0.4 to 1: 1.4 (V/V) during the fermentation.Temperature: check temperature value at any time, controlled temperature changes at 30 ± 2 ℃.
5) at ferment tank 6-8h, keep its air flow to be: 1: 1-1: 1.4 (V/V).
Three, quality product detected result:
The quality product detected result sees Table 2.
Table 2 D1-23 bacterial strain of the present invention and YBT-1520 bacterial strain are to the comparison of fermented liquid virulence
| Batch fermentation | Bacterial strain | Fermentation period (h) | Virulence | |||
| To bollworm toxicity evaluation (IU/ μ L) | LC to beet armyworm 50 (μL/mL) | ICPs content (mg/mL) | The content of Zwittermicin A (units/mL) | |||
| 2005-4-12 2005-5-1 2005-5-15 | D1-23 YBT-1520 D1-23 YBT-1520 D1-23 YBT-1520 | 29.5 28 29.5 27.5 29 28 | 6251 5581 6000 5186 5910 5356 | 0.272 0.783 0.238 0.883 0.289 0.838 | 6.02 6.12 5.96 5.65 5.75 5.83 | 155 48 165 45 170 40 |
Above data are the mean value of three repeated experiments data.
YBT-1520 compares with control strain, and D1-23 bacterial strain of the present invention is to the biological assay LC of beet armyworm
50Mean value is 0.266 μ L/mL, and average virulence has improved 213.78%; To the biological assay of bollworm the mean value 6053IU/ μ L that tires, average biological value has improved 12.63%; Zwittermicin A output mean value is 163.33 units/mL, and mean yield has improved 2.66 times; Crystallin output mean value is 5.91mg/mL.
Embodiment 3: the application of D1-23 bacterial strain of the present invention in thuringiensis praeparatum preparation production (or claiming preparationization)
The production of present embodiment preparation is carried out for the method shown in ZL 01128475.7 document with reference to the applicant's granted patent number.
The quality product detected result sees Table 3.
The mensuration of table 3 D1-23 bacterial strain fermentation liquor of the present invention virulence
| Batch fermentation | Liquid fermentation process | Fermentation period (h) | Virulence | |||
| To bollworm toxicity evaluation (IU/ μ L) | LC to beet armyworm 50 (μL/mL) | ICPs content (mg/mL) | The content of Zwittermicin A (units/mL) | |||
| 2005-4-12 2005-5-1 2005-5-15 | The present invention of the present invention | 29.5 29.5 30 | 6251 6000 5910 | 0.272 0.238 0.289 | 6.02 5.96 5.75 | 155 165 170 |
The Tribactur D1-23 bacterial strain employing patent No. is that the method for ZL 01128475.7 is cultivated, and fermented liquid is to the biological assay LC of beet armyworm
50Mean value is 0.266 μ L/mL; To the biological assay of bollworm the mean value of tiring is 6053IU/ μ L; Zwittermicin A output mean value is 163units/mL; Crystallin output mean value is 5.91mg/mL.
Claims (4)
1, a kind of can high yield Zwittermicin A and crystallin and noctuid had the Tribactur Bacillus thuringiensis mutant strain D1-23 of high virulence, its preserving number is CCTCC NO:M206064.
2, the application of the described bacterial strain of claim 1 in the preparation thuringiensis praeparatum preparation.
3, the application of the described bacterial strain of claim 1 in the lepidopterous insects control.
4, the application of the described bacterial strain of claim 1 in the noctuid control.
Priority Applications (1)
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102732438A (en) * | 2011-04-02 | 2012-10-17 | 华中农业大学 | Bacillusthuringiensis mutant strain BMB181 with high melanin yield |
| CN103805645A (en) * | 2014-03-09 | 2014-05-21 | 桂林理工大学 | Separation and purification preparation method of water-soluble antibiotic |
| CN111885918A (en) * | 2017-08-11 | 2020-11-03 | 埃克塞特大学 | Biological insecticide |
| WO2021231757A1 (en) * | 2020-05-13 | 2021-11-18 | Bayer Cropscience Lp | Bacillus thuringiensis strains and methods for controlling pests |
-
2006
- 2006-11-03 CN CNB2006101249337A patent/CN100529056C/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102732438A (en) * | 2011-04-02 | 2012-10-17 | 华中农业大学 | Bacillusthuringiensis mutant strain BMB181 with high melanin yield |
| CN102732438B (en) * | 2011-04-02 | 2013-06-05 | 华中农业大学 | Bacillusthuringiensis mutant strain BMB181 with high melanin yield |
| CN103805645A (en) * | 2014-03-09 | 2014-05-21 | 桂林理工大学 | Separation and purification preparation method of water-soluble antibiotic |
| CN111885918A (en) * | 2017-08-11 | 2020-11-03 | 埃克塞特大学 | Biological insecticide |
| WO2021231757A1 (en) * | 2020-05-13 | 2021-11-18 | Bayer Cropscience Lp | Bacillus thuringiensis strains and methods for controlling pests |
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| CN100529056C (en) | 2009-08-19 |
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Assignee: Pucheng Lifecome Biochemistry Co., Ltd. Assignor: Huazhong Agricultural University Contract record no.: 2011350000168 Denomination of invention: High virulence Bacillus thuringiensis mutant D1-23 with high yield of ZwittermicinA and crystal protein and its application Granted publication date: 20090819 License type: Exclusive License Open date: 20070718 Record date: 20110713 |