稻瘟病生防菌对四种作物土传病害病原菌的抑制作用

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

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。

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.