棉 花 学 报     Cotton Science    2008，20(5)：364-367

Vegetative Compatibility of Verticillium Dahliae of Cotton in Guanzhong，Shaanxi
XU Nan, ZHANG Hui-xia, YANG Jia-rong, LI Yan
(College of Plant Protection , Northwest A.& F. University,Yangling,Shaanxi 712100, China)

Abstract：Because Jingyang strain is the highest aggressive strain which comes from the area of Guanzhong , Shaanxi. We studies on vegetative compatibility tests for the 18 strains of Verticillium dahliae of Guanzhong, Shaanxi and the Hetian strain from Xinjiang, Jingyang strain, Anyang strain which supplied by the Institute of Plant Protection Shaanxi Academy of Agricultural Science. According to their phenotypes on the media containing only one of the three different nitrogen sources, respectively, the results are: there were about 364 mutants obtained from 21 strains induced on KPS media , in which 289 mutants were nit1, it accounted for 79.40% of the total; 72 mutants were nitM, 19.78%; only three mutants were nit3. All except three strains, could be assigned to one vegetative compatibility group designated VCG₁, the Hetian strain belongs to VCG₂, the Anyang strain belongs to VCG₃.B18 doesn′t product the mutants.The morphological characters of vegetative compatibility zone among different compatible isolate pairs were different and stable. In a word, the main reason for Verticillium dahliae of the strains of Guanzhong leading to seriously lost on the economy is that their dominant population belong to the VCG₁.
Key words：vegetative compatibility；nit mutant；Verticillium dahliae；Shaanxi guanzhong
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