棉花黄萎病菌与品种互作的格局分析

 以23个棉花品种(系)接种18个黄萎病菌株的抗感表现(病情指数)为分析对象，在聚类分析的基础上用双标图方法研究了寄主 病原的互作格局。结果表明：23个棉花品种分为6个抗病性不同的品种组，18个菌株聚为5个致病力不同的菌株群。5031和50312组成的品种组G1对所有菌株群具有最高抗性，可作为抗黄育种的高抗质源。来自河北成安的VD25与来自江苏常熟的XS4、XS6和XS7组成的菌株群S4与G5品种组存在互作，其致病力最强，是棉花黄萎病的优势菌株群，在抗黄育种和抗黄鉴定中应予以高度重视。S2和S3菌株群与56%的参试品种构成的3个品种组间存在互作，是潜在的优势菌株群。具平均抗病性的G2品种组是黄萎病菌的优良寄主。

Pattern Analysis of the Interaction between Verticillium dahliae Strains and Cotton Varieties

In order to study the interaction pattern of strains and cotton varieties, the disease indices of twenty-three different resistant or susceptible varieties inoculating 18 isolates of Verticillium dahliae were analyzed by biplot method based on cluster analysis. The results showed that 23 cotton cultivars were grouped into six clusters, and 18 Verticillium dahliae strains were clustered into five groups. With the highest resistance to all strain groups, variety cluster G1 which was consisted of two lines (5031 and 50312) could be used as good resistant resource in breeding of Verticillium wilt resistance. There is a high host-pathogen interaction between strain group S4 and variety group G5. As dominant strains and with the highest pathogenicity, S4 consisting of 4 Verticillium dahliae strains among which VD25 came from Chengan of Hebei Province and the rest, named as XS4, XS6, and XS7 all from Changshu of Jiangsu Province, should be very important in identifying and breeding for Verticillium wilt resistance. Strain groups S2 and S3, which highly interacted with 3 variety groups (accounting for 56% of the tested material), might be the potential dominant strains. With average resistance to all strains, variety group G2 was the excellent host for Verticillium dahliae.