广西水稻纹枯病菌菌丝融合群鉴定初报

Identification of anostomasis groups of Rhizoctonia on Rice in Guangxi

从广西36个县(市)采集水稻纹枯病标样,经分离纯化后获得186个丝核菌菌株。菌丝融合测试结果表明,这186个丝核菌菌株分别属于3菌丝融合群:即立枯丝核菌(Rhizoctoniasolani)的AG-1-IA和AG-4融合群,双核丝核菌的AGBb融合群,出现的频率分别为96.4%、2.15%和1.62%。不同的菌丝融合群在菌丝生长速率方面存在明显的差异,其中AG1-IA的生长速率最大,AGBb生长速率最小。

One hundred and eighty-six isolates of Rhizoctonia spp. were obtained from tissues of rice sheath blight in 36 counties of Guangxi Province. According to the hyphal fusion with international standard isolates of anastomosis groups （AGs） of Rhizoctonia, the multinucleate series belong to R. solani AG-1 IA and AG-4, and the binucleate series belongs to AGBb. The frequency was 96.5%, 2.15 %, 1.6 %, respectively. The mycelia growth rates were different among the various Ags. The growth rate of the isolates of AG-1-IA was the highest, and the isolates of AGBb were the lowest.