在水稻生态系统中纹枯病拮抗细菌的分布和种类

 通过对从菲律宾Laguna省水稻植株上分离获得的700个细菌菌株进行离体与生物测定发现，在水稻生态系统中，存在着大量格兰氏阴性、非致病性、对纹枯病有拮抗作用的细菌微生物。根据拮抗细菌分离来源分析结果表明，从病株和水稻生长后期能分离到比健株和生长前期更多的拮抗细菌。用Biolog的方法测定了195个细菌菌株的种类。在147个格兰氏阴性菌株中有13个属39个种，在48个格兰氏阳性菌株中有8个属13个种。在195个被测菌株中有20个菌株对纹枯病菌具有较强的拮抗作用，它们分别归属于7个属12个种。

The Distribution and Species of Antagonistic Bacteria Against Sheath Blight in Rice Ecosystem

Seven hundred bacterial strains were isolated from diseased or healthy rice plant in Laguna Provinceof Philippines, and then were tested at gram reaction, antagonistic and pathogenicity. There were a lot of G~-, antagonistic and non-pathogenetic bacteria in the rice ecosystem. Antagonistic bacteria isolated from diseased riceplant and at milking to maturity stage were more than that from healthy rice plant and at maximum tillering to flowering stage. Two hundred bacterial strains of them were identified for their species by Biolog. There were 13 genera, 39 species in the 147 G~- bacteria and 8 genera,39 species in the 48 G~ bacteria occurred in rice ecosystem. In 195identified bacteria, 20 isolates possessed stronger antagonistic ability and distributed in 7 genera and 12 species.