新疆苜蓿立枯丝核菌菌丝融合群及其致病性研究  

Study on anastomosis groups and their pathogenicity of Rhizoctonia solani isolated from alfalfa in Xinjiang

作　　者：李克梅[1] 郭庆元[1] 赵莉[1] 陈祥忠[1] 

机构地区：[1]新疆农业大学农学院新疆草地资源与生态重点实验室,新疆乌鲁木齐830052

出　　处：《草业科学》2009年第5期151-154,共4页Pratacultural Science

基　　金：新疆现代化畜牧业试验示范项目;新疆维吾尔自治区高技术研究与发展计划项目(200511102))

摘　　要：从新疆苜蓿Medicago sativa种植区采集的苜蓿根腐病病株及土样中分离得到155个丝核菌Rhizoc-tonia菌株,经鉴定其中126株为立枯丝核菌Rhizoctonia solani菌株。对126个立枯丝核菌菌株进行菌丝融合群(AG群)组成及各融合群对苜蓿的致病性进行了判定和致病性测定研究。结果表明,在新疆苜蓿上的立枯丝核菌菌丝融合群有AG1、AG2、AG4、AG5 4种类型,其出现频率分别为11.2%、46.6%、6.1%和36.1%。其中AG2和AG5分离频率较高,为优势融合群。各融合群对苜蓿苗期致病性差异显著,以AG2致病性最强。155 strains of Rhizoctonia were isolated from diseased plant and soil in alfalfa （Medicago sativa） fields in Xinjiang, China. 126 strains of them were identified as R. solani. The research reported the composition and pathogenicity in anastomosis groups of R. solani in alfalfa. According to the discriminative results of anastomosis groups（AGs）, these strains of R. solani were categorized as the following four anastomosis groups（AGs） ： AG1, AG2, AG4, AGS. Their occurrence frequency in order was 11.2% ,46.6%,6. 1% and 36.1%. AG2 and AG5 which have higher frequency of separation are the edge of anastomosis groups. The testing results showed that pathogenicity of each anastomosis groups were significantly different, and AG2 had the strongest pathogenicity.

关 键 词：苜蓿 立枯丝核菌 融合群 致病性 

分 类 号：S435.4[农业科学—农业昆虫与害虫防治]