Bacillus velezensis with broad-spectrum disease resistance and application of Bacillus velezensis

A technology of Bacillus velesi and strains, applied in application, bacteria, fungicides, etc., can solve unseen problems and achieve the effect of strong viability, wide adaptability and good biocontrol effect

Active Publication Date: 2019-09-27
BEIJING AGRO BIOTECH RES CENT
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

Although there are reports that the bacillus isolated from tomato, cotton, and tobacco soil has a control effect on sclerotinia, there is no research on the prevention and control of sclerotia and soft rot bacteria at the same time for a single biocontrol bacterium (Zheng Xuefang, Liu Bo, Zhu Yujing , Ge Cibin, Liu Guohong. Screening and identification of Bacillus for the biocontrol of tomato bacterial wilt[J]. Chinese Journal of Biological Control, 2016, 32(5):

Method used

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  • Bacillus velezensis with broad-spectrum disease resistance and application of Bacillus velezensis
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Experimental program
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Example Embodiment

[0040] The isolation of embodiment one bacterial strain BPC6

[0041] A total of 10 soil samples were collected from the root circumference of lettuce in Maizhuang Village, Xingshou Town, Changping District, Beijing. Bacteria were separated by the gradient dilution coating plate method, 10g soil samples were placed in 100mL sterile water, 28°C, 180r / min shaking culture for 1h to prepare soil sample suspensions, and the soil suspensions were diluted to 10 with sterile water respectively. -3 、10 -4 、10 -5 Gradient, each pipette 100 μL was evenly spread on LB solid medium, cultured at 28°C for 24 hours, and single colonies with different traits such as color and shape were picked and purified.

[0042] Inoculate the purified strain and Pectinosa carotosa in 10 mL of LB medium, culture at a constant temperature of 180 r / min and 28°C for 16 hours, take 100 μL of Pectin bacillus carotosa suspension and spread it on the LB medium, based on 4 Drill holes at each point with a diamet...

Example Embodiment

[0043] Physiological and biochemical characteristics identification of the second bacterial strain BPC6

[0044] 1. Identification of morphological characteristics

[0045] With reference to Dong Xiuzhu etc. (Dong Xiuzhu, Cai Miaoying. Common Bacteria System Identification Handbook [M]. Beijing: Science Press, 2001, 186-188.), observe the colony form of BPC6 on the LB solid medium, by leather Ran's staining was used to observe the morphological characteristics of BPC6.

[0046] BPC6 cultured by LB, the morphology is as follows figure 1As shown in A, the diameter of the colony is 0.95-12.3 mm, milky white, opaque, irregular in shape, smooth, moist and shiny on the surface, convex in the center, neat in edge shape, and odorless. Microscopic examination showed Gram-positive bacteria, which were club-shaped and rod-shaped, with a size of (0.6-1.0) μm × (2.0-4.0) μm, with spores ( figure 1 B).

[0047] 2. Physiological and biochemical tests

[0048] With reference to the met...

Example Embodiment

[0052] Molecular Biology Identification of Example Three Bacterial Strain BPC6

[0053] 1. Use Easy Pure Plant Genomic (Beijing Quanshijin Biotechnology Co., Ltd.) kit to extract DNA, and use 1% agarose gel electrophoresis to detect its purity and concentration. Using the extracted genomic DNA as a template, the 16S rDNA sequence was amplified with bacterial universal primers. Primer BSF(27f): AGAGTTTGATCCTGGCTCAG; BSR(1541r): AAGGAGGTGATCCAGCCGCA. PCR reaction conditions: 95°C, 4min; 94°C, 40s, 55°C, 45s, 72°C, 1min, 32 cycles; 72°C, 5min. After the PCR product was detected by 2% agarose gel electrophoresis, it was sequenced by Beijing Biomed Company, and the sequence obtained was shown as SEQ ID NO:3. The measured 16S rDNA sequence was searched for homology on the NCBI nucleic acid database using the Blast program, and the 16S rDNA phylogenetic tree was constructed using the Neighbor-Joining Tree method through the MEGA X software (repeated sampling 1000 times), as shown i...

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Abstract

The invention relates to Bacillus velezensis with broad-spectrum disease resistance and application of Bacillus velezensis. The Bacillus velezensis BCP6 is preserved in the China General Microbiological Culture Collection Center in May 15, 2019, and the preservation number is CGMCC No. 17805. The Bacillus velezensis provided by the invention has a remarkable inhibition effect on bacterial soft rot and sclerotinia sclerotiorum of lettuces, and meanwhile has broad-spectrum antibacterial activity on plant pathogenic fungi such as Botrytis cinerea, Fusarium solani, F.oxysporum, Penicillium sp. and Rhizoctonia solani and plant pathogenic bacteria such as Acidovorax citrulli, Pseudomonas syringae, Xanthomonas oryzae, Ralstonia solanacearum and P. marginalis. Meanwhile, the Bacillus velezensis has salt and alkali resistance and has significant biocontrol application prospects.

Description

technical field [0001] The invention belongs to the field of microorganisms, specifically relates to the field of biological control, and more specifically relates to Bacillus Velez and its application. Background technique [0002] Because lettuce is rich in nutrients such as protein, sugar and vitamins, it is widely cultivated all over the world and is favored by consumers. , Wang Yubin, Zhao Xiaoyan, Zhang Chao. The effect of LED light treatment on the quality and flavor of fresh-cut lettuce [J]. Modern Food Science and Technology, 2019, 35(5):1-8.), taking Beijing as an example, it is also a sowing One of the largest green leafy vegetables (Lei Xihong, Li Wei, Sun Chaohua, Li Xinxu, Feng Ying, Wang Yanfang. Vegetable factory production (8) High-quality lettuce hydroponic production technology [J]. Chinese Vegetables, 2019 (02) :87-91.). Common diseases of lettuce in the cultivation process include sclerotinia, bacterial soft rot, etc., which have brought serious losses...

Claims

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Application Information

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IPC IPC(8): C12N1/20A01N63/00A01N63/02A01P3/00A01P1/00A01G13/00A01G7/06C12R1/07
CPCA01N63/00A01G13/00A01G7/06C12R2001/07C12N1/205A01N63/10
Inventor 谢华陈昌龙田宇孙旺旺
Owner BEIJING AGRO BIOTECH RES CENT
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