北疆棉花苗期病害拮抗菌7B-1的研究

 从北疆棉花根际土壤中采集土样 36份 ,经室内分离、纯化后获得生长数量占优势的细菌菌株 84个 ,对棉花立枯病的病原菌进行平板对峙培养法拮抗测定 ,共筛选出 2 8个有拮抗活性的细菌菌株 ,对其进行筛选、比较后 ,选出拮抗活性较强的 3个细菌菌株进行盆栽试验和棉花苗期病害的田间小区防治试验 ,最后确定了 7B 1拮抗细菌菌株。在此基础上研究了芽孢杆菌 7B 1对新疆棉苗病害强致病菌株R10 5的拮抗作用机制 ,结果表明 ,7B 1能引起R10 5菌丝溶解和畸形 ,其代谢物对R10 5的菌丝生长有抑制作用

Study of Antibiotic Bacterium 7B-1 on Cotton Seedling Diseases in Xinjiang

soil samples were collected from the rhizosphere of cotton in Shihezi locations, and 84 bacteria strains with the well growth were obtained by the isolation and purification of Lab. By the test experiment in plate to their antagonistic activity against cotton Rhizoctonia solani, 28 bacteria strains with the antagonistic activity were found, 3 strains with the strong antagonistic activity were selected from the 28 strains, and used in the small farm experiments of the basin growing and the seedling term disease of cotton. As a result, 7B 1 has the very strong antagonistic activity. From the study that biocontrol Bacillus spp. 7B 1 antagonize R 105 strong pathogen of cotton seedling diseases in Xinjiang, we obtain the result that 7B 1 can result in the melting and deforming of R 105 mycelium, and the metabolize products of 7B 1 restrains the growth of R 105 mycelium.