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从采自南疆主要植棉区的4地(州)18县(市)的棉花立枯病病株上分离得到455个病原分离物,从中鉴定出345个立枯丝核菌(Rhizotonia solani Kühn)菌株。采用菌丝融合性判定方法判明345个立枯丝核菌菌株分属于AG-1,AG-4和AG-5三个菌丝融合群,其出现频率分别为3.76%,91.88%,4.35%。其中AG-4在所有立枯丝核菌菌株中出现频率最高(91.88%),是南疆棉花立枯丝核菌的优势菌群。营养体亲和性判别结果表明,各菌丝融合群均有营养体亲和群分化,其中判定为AG-4的317个菌株分属于3个营养体亲和群,判定为AG-1的13个菌株和判定为AG-5的15个菌株各自分属于2个营养体亲和群。
A total of 455 pathogenic isolates were isolated from cotton blight isolates from 4 prefectures (prefectures) and 18 counties (cities) in the main cotton planting area of South Xinjiang. 345 Rhizoctonia solani Kühn ) Strain. The results of mycelial fusion test showed that 345 Rhizoctonia solani isolates belonged to fusion group of AG-1, AG-4 and AG-5, the frequency of occurrence was 3.76%, 91.88% and 4.35% respectively. Among them, AG-4 appeared the highest frequency in all Rhizoctonia solani strains (91.88%), which was the dominant flora of Rhizoctonia solani in southern Xinjiang. The discriminations of vegetative compatibility showed that the mycorrhizal fusion groups all had vegetative affinity group differentiation. 317 strains of AG-4 were classified as three vegetative affinity groups and were judged to be AG-1 13 Each of the 15 isolates identified as AG-5 belonged to two vegetative affinity groups.