【摘要】 作者从郑州苹果园中分离到枯草芽孢杆菌的一株强拮抗菌株。研究认为该菌株产生的抗菌物质对镰刀菌等12种病原真菌具有抑制作用,抑菌谱广。其抑菌机理主要是融解细胞壁,造成原生质泄漏,同时也使孢子和菌丝畸形。田间小区试验证明,以B-903培养滤液浸种可有效防治棉炭疽病等棉苗病害,并促进棉苗生长发育;果园喷雾防治苹果轮纹病和叶斑病的效果相当或优于化学药剂。更多还原

【Abstract】 Bacillus subtilis B-903 strain was isolated from apple orchard in Zhengzhou. The antagonistic spectrum and antifungal mechanism of B-903 strain’s antibitic substance and the control experiments were reported in this paper. B-903 antibiotic substance was an inhibitor to 12 species of pathogenic fungi supplied for test and the antifungal mechanism was mainly deformation of the spore and cell of hypha and disintegration of the cell wall. The experiments showed that soaking the cotton seeds with B-903 culture filtratd could ef-fecienlly control the disease of cotton seedling and enhance the growth of the seedling. The control effects of this antibiotics for Physalospora piricoia Nose and the leaf spot with spraying B-903 culture filtrate were better than or at least equal to those of chemical fungicide.更多还原