从稻种上筛选拮抗细菌防治水稻纹枯病的研究

从 1 3个水稻品种上获得 2 83个细菌分离物 ,其中 2 9个菌株对水稻纹枯病菌(Rhizoctoniasolani)产生了拮抗作用 ,占总菌株数的 1 0 .2 5 % ,8个菌株对水稻紫鞘病产生了拮抗作用 ,占总菌株数的 2 .83 % ,而没有菌株对水稻恶苗病菌 (Fusariummoniliforme)产生拮抗作用 ;经离体平板拮抗作用的测定、离体纹枯病病斑面积的抑制和植物生长促进试验 ,筛选出两个有潜在价值的菌株 ,这两个菌株经鉴定均为芽孢杆菌 (Bacillussp.)。

Screening Potential Microbial Biological Control Agents from Rice Seeds to Rice Sheath Blight (Rhizoctonia solani)

Two hundred and eighty-three(283) bacterial isolates were obtained from rice seeds of 13 varieties. Twenty-nine(29) isolates produced inhibitory effect against Rhizoctonia solani(10.25%), eight(8) isolates against Sarocladium oryzae(2.83%), while none produced inhibitory effect against Fusarium moniliforme. Two promising isolates (i.e.8-02 and 8-09) were screened through the experiment for the detection of antagonistic activity in vitro, suppression of bacterial suspension on sheath blight lesion in vitro, and plant growth promotion test. Both isolates were identified as Bacillus spp.