摘要
以1个海岛棉品种和15个陆地棉品种为分离寄主,采取单孢分离,共分离出67个黄萎病菌系。以抗性差异较大的海岛棉品种Pima90-53和陆地棉品种冀棉20、邯208和中棉所8号为鉴别寄主,采用苗期营养钵定量注菌液法对分离菌系进行了致病力鉴定。结果表明,同一地块田间不同品种所分离菌系的致病力类型并非单一类型,而是由致病力连续变化的多种致病力菌系类型组成;由不同品种分离出的菌系致病力存在差异,寄主品种的抗性与分离的黄萎病菌系的致病力无关,但不同基因型品种可能会影响不同致病力菌落的消长。
Sixty-seven isolates of Verticillium dahliae were obtained from infected cottons, a Gossypium barbadense cultivar and 15 Gossypium hirsutum cultivars. Pima90-53 and Jimian20 with resistance to Verticillium dahliae, Han208 and CCRI 8 with susceptibility, were used to assess the pathogenicity of the fungal isolates. We found that highly diverse pathogenic types from weak to strong existed in continuity in the same cotton field, and the pathogenic variation of isolates was very significant among populations from different cotton varieties. The resistance of hosts to Verticillium wilt did not influence the pathogenicity of isolates, however host selection may affect the population genetic structure of isolates.
出处
《棉花学报》
CSCD
北大核心
2012年第6期529-534,共6页
Cotton Science
基金
公益性行业(农业)科研专项经费(nyhyzx07-052)
河北省科技支撑计划(11220128D)
关键词
棉花
黄萎病菌
致病力
病情指数
Verticillium dahliae
pathogenicity
disease index
