分别从健康的水稻植株、感染纹枯病植株、根际土壤、秧田水和菌核上分离出能拮抗水稻纹枯病的假单胞菌属(Pseudomonas spp.)和芽胞杆菌属(Bacillus spp.)的细菌菌株。大多数菌株在室内试验中对菌丝生长有抑制作用,有的菌株在温室试验中起抑制病害和对植株有保护作用,有的(1/49)具有促进秧苗生长的作用。纹枯病的病斑相对长度与病害发生率密切相关(r~2=0.33,P=0.01),与抑菌圈大小(r~2=0.03)和离体叶片病斑大小(r~2=0.12)无相关,植株干重与病斑相对长度和发病率均无显著相关(r~2=0和0.01)。 Pseudomonas spp. And Bacillus spp. Isolated from healthy rice plants, sheath blight plants, rhizosphere soils, seedling water and sclerotia, respectively, were isolated. ) Of bacterial strains. Most strains inhibit the growth of mycelium in laboratory tests. Some of the strains inhibit plant diseases and protect plants in the greenhouse experiment. Some (1/49) have the effect of promoting seedling growth. The relative length of lesion was closely related to the incidence of disease (r ~ 2 = 0.33, P = 0.01), and the size of inhibition zone (r ~ 2 = 0.03) 0.12). There was no significant correlation between plant dry weight and the relative length and incidence of lesions (r ~ 2 = 0 and 0.01).