Abstract: Population variation and species of antagonistic bacteria against rice sheath blight under direct row seeding, direct broadcast seeding and transplanted cultural pattern with same japonica rice Bing 96-42 were surveyed in Yuhang, Hangzhou City and their relationships were analyzed. Seven thousand one hundred and ninety three bacterial strains were isolated from 810 rice samples of leaf,sheath and grain collected at six different growth stages under the three cultural patterns. Results showed that the population density of antagonistic bacteria was the highest on sheath and the lowest on grain among the three parts of rice plants under each cultural pattern and basically declined with the maturity of rice plants. Appearance of peak of the antagonistic bacteria at growth stages varied with different cultural patterns. The percentage of antagonistic bacteria against the total bacterial population was maintained at 3.6%-4.8% under direct row seeding cultural pattern from seedling to waxy ripening stages and no significant difference among the six stages, however, it varied with different growth stages of rice under other cultural patterns. Fourteen bacterial species or types of eight genera were identified from 539 antagonistic bacteria. No relationship was observed between the cultural patterns and bacterial species of the antagonistic bacteria.

Key words: rice, cultural pattern, antagonistic bacteria, sheath blight of rice, bacterial species

摘要： 以晚粳品种丙96-42为试材对杭州临平镇条播、撒播和移栽方式下水稻纹枯病拮抗细菌的群体变化及种类进行了研究，从水稻不同生育期采集叶片、叶鞘和谷粒样本810份，获得细菌菌株7193个。结果显示，在每种种植方式下，稻株上的拮抗细菌数量都是叶鞘中最多，谷粒中最少。3种种植方式下水稻纹枯病拮抗细菌的群体数量基本上是随着稻株成熟而逐渐下降，在水稻6个生育期中，拮抗细菌出现的高峰因不同种植方式而有所差异。条播稻上拮抗细菌占细菌总量的比率从苗期到蜡熟期维持在3.6%～4.8%，各生育期之间无显著差异，但撒播和移栽稻上拮抗细菌所占的比率因不同生育期而有所不同。从539份纹枯病拮抗细菌中鉴定出8个属的14个种，不同种植方式与水稻纹枯病拮抗细菌的种类无明显差异。

关键词: 水稻, 种植方式, 拮抗细菌, 水稻纹枯病