CN117535168A - Bacillus megaterium ZLP-21 and application thereof - Google Patents

Bacillus megaterium ZLP-21 and application thereof Download PDF

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CN117535168A
CN117535168A CN202310964627.8A CN202310964627A CN117535168A CN 117535168 A CN117535168 A CN 117535168A CN 202310964627 A CN202310964627 A CN 202310964627A CN 117535168 A CN117535168 A CN 117535168A
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bacillus megaterium
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张丽萍
王雅娜
刘洪伟
张飞燕
王江平
刘秋玥
赵雯雅
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Institute of Biology of Hebei Academy of Sciences
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Abstract

The invention relates to bacillus megatheriumBacillus megaterium) ZLP-21 with the preservation number of CGMCC No.25030 has the functions of preventing diseases, killing insects and promoting plant growth. The invention also discloses application of the strain in preparing biocontrol agents, biopesticides, soil restoration agents or biofertilizers.

Description

Bacillus megaterium ZLP-21 and application thereof
Technical Field
The invention relates to bacillus megatherium ZLP-21 and application thereof.
Background
The bacillus megaterium is an aerobic and spore-producing bacillus which has the characteristics of no toxicity and harm to human and livestock, environmental friendliness, strong stress resistance, high propagation speed and the like, and can secrete a plurality of active substances. Researches show that the microorganisms have strong inhibition effects on botrytis cinerea, rhizoctonia solani, fusarium wilt, early blight germ, leaf mold germ, black spot germ, anthracnose germ, downy mildew germ, cladosporium cucumerinum, alternaria leaf spot and the like, and can promote the growth of crops.
However, there is no report on the strains having the functions of preventing diseases, killing insects and promoting plant growth at the same time.
Disclosure of Invention
The invention aims to provide bacillus megatherium ZLP-21 with functions of preventing diseases, killing insects and promoting plant growth and application thereof.
The invention adopts the following technical scheme:
bacillus megaterium @ sBacillus megaterium) ZLP-21 with the preservation number of CGMCC No.25030. The preservation unit is China general microbiological culture Collection center, and the address is: the collection date is 2022, 6 and 9 days of the national institute of microbiology, national academy of sciences, 1, 3, north Chen, west Lu, the Korean region of Beijing.
The application of the bacillus megatherium ZLP-21 in preventing and controlling diamond back moth, prodenia litura, aphid, cricket, cockroach, grub, pillworm and other pests.
Application of the bacillus megatherium ZLP-21 in preventing and controlling plant pathogenic bacteria, aquatic pathogenic bacteria and human pathogenic bacteria.
Further, the plant pathogenic bacteria comprise tomato leaf mold bacteria, tomato gray mold bacteria, pear black spot bacteria, fusarium, cotton fusarium wilt bacteria, cucumber gray mold bacteria, grape gray mold bacteria, cucumber anthracnose bacteria, cucumber downy mildew bacteria, cucumber cladosporium cucumerinum bacteria, apple sheath blight bacteria, rhizoctonia solani, corn small spot bacteria and tomato early blight bacteria.
Further, the aquatic pathogenic bacteria include aeromonas hydrophila, edwardsiella tarda and aeromonas veronii.
Further, the human pathogenic bacteria include candida albicans, staphylococcus aureus and escherichia coli.
Application of the bacillus megatherium ZLP-21 in preparing biocontrol agents, biopesticides, soil restoration agents or biofertilizers.
Further, the biocontrol agent, the biological pesticide, the soil restoration agent or the biological fertilizer comprises bacillus megatherium ZLP-21 thalli and/or fermentation liquor; or surfactant, iturin, fenethamine or spermidine separated from fermentation broth.
A bactericide comprising a surfactant, iturin, phetamine or spermidine isolated from the fermentation broth of bacillus megaterium ZLP-21.
The invention has the beneficial effects that:
the bacillus megatherium ZLP-21 is an aerobic and spore-producing rod-shaped microorganism, has the characteristics of environmental friendliness, strong stress resistance, high propagation speed and the like, and can secrete various active substances to promote plant growth.
The bacillus megatherium ZLP-21 has stronger insecticidal activity, and can effectively kill pests such as plutella xylostella, prodenia litura, aphids, cricket, cockroaches, pillers and the like. Meanwhile, the composition has broad-spectrum antibacterial property and has obvious inhibition effect on various plant pathogenic bacteria such as botrytis cinerea, rhizoctonia solani, fusarium wilt, early blight germ, leaf mold germ, black spot germ, anthracnose germ, downy mildew germ, cladosporium cucumerinum, alternaria alternata and the like.
The bacillus megatherium ZLP-21 has good application prospect in the aspects of developing functional microbial preparations such as insect killing or disease prevention and the like.
Drawings
FIG. 1 is a colony chart of Bacillus megaterium ZLP-21.
FIG. 2 is a diagram of strain ZLP-21 of Bacillus megaterium.
FIG. 3 is a diagram of the treatment group of Bacillus megaterium ZLP-21 for killing Armadillidium.
FIG. 4 is a diagram of a control group of Bacillus megaterium ZLP-21 to kill Armadillidium.
FIG. 5 shows the aphid killing treatment (left) and control (right) of Bacillus megaterium ZLP-21.
Detailed Description
The technical scheme of the present invention will be described in detail with reference to the preferred embodiments. The following examples are only for the purpose of illustrating and explaining the present invention and are not to be construed as limiting the technical solution of the present invention.
EXAMPLE 1 isolation and screening of Bacillus megaterium ZLP-21
(1) Sampling soil: collecting soil samples from Yunnan Yuxi of China, wherein each part is 50-100 g; placing into sterilized kraft paper bag, sealing the bag mouth, and recording sampling place, environment and date.
(2) Bacillus isolation and purification: soil samples were isolated on PB medium by plate dilution. The specific operation is as follows: accurately weighing 10g of soil sample, adding into 90mL 0.9% physiological saline conical flask filled with glass beads, shaking with 180r/min shaking table for 30min to uniformly distribute soil sample to obtain soil suspension with concentration of 10 -1 The method comprises the steps of carrying out a first treatment on the surface of the Sequentially diluting to a concentration of 10 -5 、10 -6 、10 -7 . Respectively carrying out constant-temperature water bath at 80 ℃ for 30min, respectively taking 100 mu L of diluent to coat a PB flat plate, and carrying out inverted culture on the flat plate in a constant-temperature incubator at 30 ℃ for 48h. Single colonies with different forms are selected, spore staining is used for identification, bacillus is purified by a streaking method and then is transferred to a PB culture medium test tube inclined plane, after being cultured at 30 ℃ for 48h, the bacillus is preserved in a refrigerator at 4 ℃ for standby.
(3) Screening of insecticidal disease-preventing strains
Screening of insecticidal strains: taking aphids as target organisms, carrying out liquid shake flask fermentation culture on the purified microorganisms, centrifuging the fermentation liquor at the speed of 12000r/min for 10min to remove thalli, filtering the supernatant with a 0.22 mu m sterile filter membrane to prepare sterile fermentation filtrate, and properly diluting the fermentation filtrate. Putting the broad bean stem leaves with proper length into a conical flask. Spraying a proper amount of diluent to living aphids and stems and leaves, putting into a conical flask, covering the bottle mouth with thin gauze and fixing with rubber bands. After 2d, counting the number of aphids, and screening out strains with good insecticidal effect.
Screening strains with disease prevention effect: the gray mold of cucumber is used as indicator bacteria, and a flat plate counter method is adopted for primary screening. The method comprises the steps of preparing a d=5mm bacterial cake of the gray mold pathogenic bacteria growing on a PDA culture medium by using a puncher in a sterile operation room, transferring the bacterial cake to the center of a PDA culture medium flat plate, respectively transferring sterile filtrate of each antagonistic bacteria obtained by primary screening to a position 2.5cm away from the pathogenic bacteria, setting 3 repetitions, simultaneously taking a flat plate only containing the pathogenic bacteria cake as a contrast, culturing at a constant temperature of 26 ℃, and measuring the colony diameter and calculating the average inhibition rate when CK grows to be full of the culture medium. Screening out strains with strong antagonism to pathogenic bacteria. The strain with strong insecticidal and disease-preventing effects is frozen and preserved at the temperature of minus 80 ℃.
(4) Identification of insecticidal disease-preventing strains
According to the experimental method in the common bacteria system identification manual, morphological and physiological biochemical identification is carried out on the strains with stronger insecticidal and disease-preventing effects obtained by screening. The strain was cultured on PB medium plate at 32.+ -. 1 ℃ for 14-16 h, and the colony numbered ZLP-21 was observed to be milky white, matt, rough in surface and irregular in edge, flat and concave, and the thallus was rod-shaped (as shown in FIG. 1-FIG. 2). The physiological and biochemical identification indexes are shown in table 1.
TABLE 1 physiological and biochemical characteristics of the strain ZLP-21
The strain with the number ZLP-21 is determined to be bacillus through morphological observation and physiological and biochemical experiments. And then carrying out molecular biology classification and identification, and adopting 16S rDNA sequence analysis to extract total genome DNA of the strain as a template to amplify the 16S rDNA sequence. The target fragment is amplified by adopting a universal primer 27F/1492R, and the amplified product is detected by 1% agarose gel electrophoresis and is subjected to gene sequencing by adopting a two-way sequencing method. Sequencing results BLAST sequence homology comparison is carried out through GenBank database, and then the strain with the number ZLP-21 is identified as bacillus megaterium @Bacillus megaterium) The bacillus megaterium ZLP-21.
The bacillus megatherium ZLP-21 is sent to the China general microbiological culture Collection center for preservation, the address is China national academy of sciences of China, no. 3, north Chen, west Lu, 1, chao, beijing, the preservation number is CGMCC No.25030, and the preservation date is 2022, 6, 9.
EXAMPLE 2 killing Effect of Bacillus subtilis ZLP-121 on pests such as plutella xylostella, spodoptera litura, aphid, cricket, cockroach and Armadillidium
Fermenting and culturing bacillus megaterium ZLP-21. NB liquid medium was used, the formulation was: beef extract 5 g-L, peptone 10g/L, naCl g/L, glucose 10g/L, pH7.0. Inoculating the strain into a culture medium according to the inoculum size of 5%, and culturing in a shake incubator at 180r/min and 32 ℃ for 48 hours to obtain fermentation broth. The fermentation broth level (viable count) was 5.3X10 6 cfu/mL。
And (3) culturing fermentation liquor (a treatment group) of bacillus megatherium ZLP-21 and NB liquid culture media (a control group) in an environment with the temperature of 25-28 ℃ for 24 hours, uniformly spraying the fermentation liquor on the surfaces of insects by the treatment group, and uniformly spraying the NB liquid culture media on the surfaces of the insects by the control group, so that the surfaces of all insects can be contacted with liquid. And after spraying, the mixture is placed in a room for culture at normal temperature, and after 24 hours, the death number is counted and the corrected death rate is calculated, as shown in Table 2 and figures 3-5.
Wherein, correction mortality = (treatment group mortality-control group mortality)/(1-control group mortality) ×100%; mortality = number of dead insects/total number of insects x 100%.
TABLE 2 killing effect of Bacillus megaterium ZLP-21 on pests
EXAMPLE 3 antibacterial Spectrometry of Bacillus megaterium ZLP-21
Common pathogenic bacteria such as: a plurality of plant pathogenic bacteria such as tomato leaf mold bacteria, tomato gray mold bacteria, pear black spot bacteria, fusarium, cotton fusarium wilt bacteria, cucumber gray mold bacteria, cucumber anthracnose bacteria, cucumber downy mildew bacteria, cucumber cladosporium cucumerinum bacteria, apple alternaria alternata, rhizoctonia solani, corn small spot bacteria, tomato early blight bacteria and the like; aquatic pathogenic bacteria such as Aeromonas hydrophila, edwardsiella tarda, aeromonas veronii, etc.; and pathogenic bacteria of candida albicans, staphylococcus aureus, escherichia coli and the like are used as targets, and a plate counter method is adopted to measure the bacteriostasis spectrum of the strain ZLP-21, so that the inhibition capability of the strain ZLP-21 on the growth of the pathogenic bacteria is determined.
As can be seen from the implementation results of Table 3, the strain ZLP-21 has strong antagonism to 20 pathogenic bacteria, wherein the inhibition to the tomato leaf mold bacteria is strongest, and the diameter of the inhibition zone can reach 31.30mm. The bactericide which takes the fermentation broth of bacillus megaterium ZLP-21 as an active ingredient has good application value in agricultural production.
TABLE 3 inhibition of Bacillus megaterium ZLP-21 against different plant pathogens
EXAMPLE 4 Protoffee of Bacillus megaterium ZLP-21 sterilant
Cucumber is selected as a test crop, 20 plants/pot of indoor potted cucumber seedlings are arranged in parallel, 3 bacillus megaterium ZLP-21 fermentation liquor is applied to a treatment group (the method is the same as that of example 2, and the viable count is more than or equal to 10) 6 cfu/mL) and carbendazim solution (1 g of carbendazim is dissolved in 800mL of water) are uniformly mixed according to the volume ratio of 500:1 and sprayed to dry, and the number of viable bacteria is 10 7 cfu/kg soil application; the control group did not apply any pro-growth products. Then 10 cucumber seedlings of 28 days old are randomly selected, the plant height of the seedlings is measured by a ruler, and the stem thickness is measured by a vernier caliper. Deactivating enzyme at 105deg.C for 15min, oven drying at 75deg.C to constant weight, measuring dry mass of aerial part and underground part, measuring chlorophyll content by ethanol-acetone extraction method, and measuring photosynthetic parameters by portable photosynthetic measurement system.
As can be seen from Table 4, the Bacillus megaterium ZLP-21 bactericide has been improved by 2.78%, 9.07%, 18.57%, 15.41%, 0.71%, 75.32%, 7.44%, 115.79%, 60.10% and 89.31% in terms of plant height, stem thickness, fresh mass of aerial parts of cucumber seedlings, dry mass of aerial parts, leaf area, fresh mass of aerial roots, dry mass of aerial parts, total root volume of aerial parts, total chlorophyll amount and net photosynthetic rate as compared with CK, and has reached a level of significant difference except for plant height, leaf area and dry mass of aerial parts. The bacillus megaterium ZLP-21 bactericide has obvious growth promoting effect on cucumber seedlings.
TABLE 4 Protoffee of Bacillus megaterium ZLP-21 fermentation broths on cucumber seedlings
Note that: identical letters of the same row representPMore than 0.05, the difference is insignificant and the different letters representPLess than 0.05, the difference is significant.
The above-mentioned examples and methods are the best embodiments of the present invention, and the present invention can be partially changed, modified, substituted and combined without departing from the technical principles of the present invention, and the present invention is also included in the scope of protection of the present invention.

Claims (7)

1. Bacillus megaterium @ sBacillus megaterium) ZLP-21, characterized in that the preservation number is CGMCC No.25030.
2. Use of the bacillus megatherium ZLP-21 according to claim 1 for controlling plutella xylostella, prodenia litura, aphid, cricket, grub, cockroach and pillworm.
3. Use of the bacillus megaterium ZLP-21 according to claim 1 for controlling phytopathogens, aquatic pathogens and human pathogens.
4. The use according to claim 3, wherein the plant pathogenic bacteria comprise botrytis cinerea, sporotrichum pyriformis, fusarium cotton wilt, botrytis cinerea, rhizoctonia cerealis, rhizoctonia solani, alternaria solani; the aquatic pathogenic bacteria include Aeromonas hydrophila, edwardsiella tarda and Aeromonas verrucosa.
5. Use according to claim 3, wherein the human pathogenic bacteria include candida albicans, staphylococcus aureus and escherichia coli.
6. Use of bacillus megatherium ZLP-21 according to claim 1, in the preparation of biocontrol agents, biopesticides, soil restoration agents or biofertilizers.
7. A bactericide is characterized by comprising bacillus megaterium ZLP-21 thalli, fermentation liquor or surfactant, iturin, fenethazine or spermidine separated from the fermentation liquor.
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