Bacillus subtilis and application of bacillus subtilis in preventing and curing peony root-knot nematode
A technology for Bacillus subtilis and peony root-knot nematodes, applied in the directions of application, nematicides, bacteria, etc., can solve the problems of difficult colonization, poor control effect, etc., and achieves novel strains, remarkable effects, and high content of live bacteria. Effect
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Embodiment 1
[0023] Embodiment 1 Mutagenesis screening and identification of Bacillus subtilis strain SDBRM01
[0024] 1. Mutagenesis and screening of strains
[0025] (1) Starting strain: Bacillus subtilis SGBs-02 strain, which was isolated from greenhouse soil in Wangwu Village, Tianliu Town, Shouguang City, Shandong Province.
[0026] (2) Medium:
[0027] NA medium: beef extract 3g, peptone 10g, NaCl 5g, agar 14g, water 1000mL, pH7.3;
[0028] NB medium: beef extract 3g, peptone 10g, NaCl 5g, water 1000mL, pH7.3;
[0029] (3) Preparation of mutagen
[0030] Activate and culture the SGBs-02 strain at 28°C for 24 hours, pick 2-3 rings, inoculate them in a conical flask (250 mL) filled with 100 mL of NB culture solution, and culture with shaking at 200 r / min for 12 hours, as the seed solution, draw 2 mL of seeds solution, inoculated into NYBD culture solution, cultured with shaking for 36 hours, stored at 4°C, and used for later use.
[0031] (4) UV mutagenesis treatment
[0032] Dil...
Embodiment 2
[0046] Example 2 Verification of indoor effect of Bacillus subtilis SDBRM01 on root-knot nematode of peony
[0047] 1. Experimental method
[0048] 1.1 Preparation of root-knot nematode second-instar larvae suspension
[0049] Fresh egg masses of root-knot nematodes were picked from the roots of peony, incubated in a Beman funnel, and collected once after 24 hours for a total of 7 days. The nematode solution was diluted to contain 100 second-instar larvae / mL, and stored at 4°C for later use.
[0050] 1.2 Preparation of egg suspension
[0051] Cut peony roots with root-knot nematodes into pieces and put them into a triangular flask, add 100mL of 0.5% NaClO solution, shake vigorously for 1-2 minutes, quickly pour them into a 200-500-mesh sieve group and rinse them with tap water for 10 minutes, and collect them through a 500-mesh sieve Eggs in the net were diluted to an egg suspension with a concentration of 3000 grains / mL.
[0052] 1.3 Indoor and in vitro measurement
[00...
Embodiment 3
[0063] Embodiment 3 Preparation of Bacillus subtilis strain SDBRM01 wettable powder
[0064] (1) Transfer the preserved Bacillus subtilis SDBRM01 to the slant of the NA test tube, and place it in an incubator at 26°C for constant temperature cultivation for 2-3 days;
[0065] (2) Under sterile conditions, dilute the cultured Bacillus subtilis SDBRM01 with sterile water (add 5 mL of sterile water to the slope of each test tube), draw 1 mL, put it in NB liquid medium, and culture it on a shaking table at 28 ° C 1~2d to obtain the seed solution;
[0066] (3) The seed solution was inoculated into a large amount of fermentation medium at a ratio of 3.0% (volume ratio), the culture temperature was 28° C., the culture time was 36 h, and the ventilation ratio was 1:0.8. After the fermentation is completed, the number of bacteria can reach 8 billion / g;
[0067] (4) One or more of the Bacillus subtilis fermentation liquid matrix selected from peat, micronized calcium carbonate and ben...
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