Abstract: From July to October 1998, isolates collected from rice leaves were used to study the microbes community of phyllosphere, the interaction of phyllosphere microbes for screening antagonistic bacteria to Xanthomonas oryzae pv. oryzae. The result showed that Alternaria spp., Fusarium spp., Flavobacterium spp., Xanthomonas spp., Pseudomonas spp. and Bacillus spp.were main species. The isolates with obviously antagonistic ability to Xanthomonas oryzae pv. oryzae belong to Bacillus. The results also showed that Bacillus spp. have antagonistic ability to most of other phyllosphere isolates on rice leaves.

Key words: rice, phyllosphere microbes, interaction, Xanthomonas oryzae pv. oryzae, antagonistic isolate, biological control

摘要： 1998年7月～10月, 于田间汕优63水稻叶片上分离采集微生物, 并进行叶围微生物鉴定，以筛选白叶枯病拮抗菌。结果表明:除极少量分布的真菌和细菌外, 主要种群包括真菌类群Alternaria和 Fusarium属; 细菌类群Flavobacterium, Xanthomonas, Pseudomonas和Bacillus属。对白叶枯病菌（Xanthomonas oryzae pv. oryzae）具有明显拮抗作用的微生物为Bacillus属，而且Bacillus属细菌对其余大部分叶围微生物具有程度不同的拮抗作用，可以初步断定其产生的拮抗物质具有一定的广谱性。

关键词: 水稻, 叶围微生物, 互作, 白叶枯病菌, 拮抗菌, 生物防治