稻瘟病生防菌对四种作物土传病害病原菌的抑制作用

利用稻瘟病生防菌(短小芽孢杆菌)对4种主要作物土传病害病原菌进行抑菌作用试验。结果表明,此生防菌对4种作物土传病害病原菌具有不同程度的抑制作用,100倍生防菌发酵稀释液对4种土传病原真菌--辣椒枯萎白绢病菌、节瓜枯萎病菌、香蕉枯萎病病菌、粉蕉根腐病菌生长抑菌率在41.18%以下,显著低于对稻瘟病菌生长的抑制率(69.85%);生防菌发酵原液对香蕉枯萎病菌的孢子萌发具有较好的抑制作用,抑制率达到86.67%,显著大于其他处理的抑制作用;但不同倍数的生防菌液对节瓜枯萎病菌的抑制差异不显著,抑制率介于76.34%~84.97%之间。

The Inhibitive Effect of Antagonistic bacterium Controlling Rice Blast on Four Soil-borne Pathogenic Fungi

Antagonistic bacterium controlling rice blast was tested on its inhibitive efficacy to the hypha growth and conidium germination of Pythium sp.,Sclerotium rolfsii,Fusarium oxysporum f.sp.cubense and Fusarium oxysporum f.sp.binincasae.The result showed that antagonistic bacterium was of different significant inhibition to four soil-borne pathogenic fungi.The inhibitive rates of 100-fold fermented Antagonistic bacteria liquid against the growth of the above four pathogenic fungi were between 26.47%~ 41.18%,while its inhibitive rate against the growth of Magnaporthe grisea was 69.85%.The inhibitive rates of initial fermented liquid against the conidia germination of Fusarium oxysporum f.sp.cubense and Fusarium oxysporum f.sp.binincasae were 86.88% and 76.34%,respectively.The action mechanism of the Antagonistic bacterium showed that it could break down hyphae,turn the hypha cells into swollen sacs,and inhibit conidial germination.