One strain of streptomyceslavendulae X33 and applications thereof
A technology of Streptomyces lavender, CCTCCNO.M2013163, applied in the direction of application, bacteria, fungicides, etc., to achieve the effect of simple use, low cost, and remarkable control effect
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Embodiment 1
[0015] Example 1: Screening and Identification of Bacterial Strain X33
[0016] Through the antibacterial test in the dish, Penicillium digitatum was used as the indicator bacteria to isolate actinomycetes from the root soil of citrus, and the strain X33 had the strongest antibacterial activity. The antimicrobial spectrum of strain X33 was measured and found that its sterile fermentation filtrate had significant inhibitory effect on 6 kinds of bacteria, 4 kinds of yeast and 6 kinds of phytopathogenic fungi, and the strain X33 had good antibacterial stability in subculture. Micromorphological, physiological and biochemical characteristics, and 16SrDNA sequence analysis, etc., identified the strain X33 as Streptomyces lavender ( Streptomyces lavendulae ).
Embodiment 2
[0017] Embodiment two: 250mL shake flask fermentation culture of bacterial strain X33
[0018] Streptomyces lilacinus griseus X33 was inoculated on Gaoshi No. 1 slant medium, and after the slant spores matured, they were inoculated in a 250mL Erlenmeyer flask containing 30mL seed culture solution at 5-10% of the inoculation amount, at 32°C and 200r / min. Under the shaking culture for 48h. Inoculate the cultivated seed solution into a 250mL Erlenmeyer flask containing 30mL of fermentation medium according to the inoculum amount of 5-10%, and first shake and cultivate at 32°C and 200r / min for 48h, and then at 28°C and 180r / min. Incubate with shaking for 24 hours.
[0019] Various media formulations are as follows:
[0020] Slant medium: soluble starch 2%, KNO 3 0.1%, NaCl0.05%, MgSO 4 0.05%, K 2 HPO 4 0.05%, FeSO 4 ·7H 2 O0.001%, agar 2%, pH7.2-7.4.
[0021] Seed medium: 2% soluble starch, 0.3% beef extract, 0.5% peptone, KNO 3 0.1%, K 2 HPO 4 0.05%, initial pH7.0.
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Embodiment 3
[0023] Embodiment three: the 50L fermentation culture of Streptomyces lilacaceae X33 bacterial strain
[0024] Inclined surface and seed culture mode are the same as embodiment two. The 50L fermentation tank inoculum volume is 5~10%, the fermentation temperature is 30℃, the tank pressure is 0.05Mpa, the stirring speed is 300r / min, the aeration ratio is 0.6-1.2vvm, the dissolved oxygen is controlled at 10-80%, and the pH of the fermentation broth is maintained at 6.5- Between 7.5 and 72 hours of fermentation time. Determination of the titer of the fermentation broth.
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