棉花学报2008，Vol.20Issue(6)：452-459,8.
接种不同致病力黄萎病菌的F1代棉花的基因型抗性研究
Genotypic Resistance of F1 Cotton Hybrids by Inoculation with Different Viru-lent Isolates of the Fungus Verticillium Dahliae Kiebahn
摘要
Abstract
The plant pathogen Verticillium dahliae causes severe cotton loss in Uzbekistan. To create cotton varieties that are resistant to the more virulent races of V. dahliae, we wanted to determine genotypic resistance of varieties and lines of cotton to more virulent isolates of different geographic populations of the fungus V. dahliae isolated from different cotton varieties in Uzbekistan, and deter-mine the inheritance of wilt resistance with hybrids of the first generation to various isolates of V. dahliae. We found that the highest wilt resistance was observed in the variety Oread and lines L-44, L-408, L155 and L-1708 to the isolates 28, 30, 32, 36, 40 and 44. They exhibited hypersensitivity when the pathogen was inoculated into the plant, but they did not display external symptoms of wilt. Wilt resistance of hybrids of the first generation as determined by inoculation with the isolates of V. dahliae was inherited according to the type of super dominance and dominance toward the resistant or susceptible parent independent from the method used to determine the disease index. Also intermedi-ate inheritance was observed. The degree of dominance depended on the combinational ability of par-ents and genotype reaction of F1 hybrids when pathogens were introduced into the plant, and also on the virulence of the isolates found in different varieties of cotton from different soil-climatic regions. The varieties with the highest phenotypic wilt resistance (i. e., tolerance) were Oread, C-5621 and lines L-44 and L-1708. Among hybrids, the hybrid combinations L-155 X C-5621 and L1708 X C-5621 had the highest phenotypic wilt resistance. The degree of tolerant resistance to wilt varied from 50% Sponsor: USDA, Agricultural Research Service - Former Soviet Union Scientific Cooperation Program, Project(P-105).to 80 %. Genetic control of resistance to V. dahliae isolates and F1 hybrids was characterized by nega-tive and positive super dominance, dominance toward the best or the worst parent and intermediate in-heritance. The hybrid combinations L-155 X C-5621 and L-155 X L-44 had the best combinational wilt resistance toward the V. dahliae isolates studied, as compared to other hybrid combinations with the maternal forms Omad, C-8284 and L-408.关键词
棉花/黄萎病抗性/遗传/优势Key words
cotton/Verticillium wilt resistance/inheritance/dominance分类
农业科技引用本文复制引用
AMANTURDIEV Alisher,KIM Robert..接种不同致病力黄萎病菌的F1代棉花的基因型抗性研究[J].棉花学报,2008,20(6):452-459,8.基金项目
This research was supported by a grant from the USDA, Agricultural Research Service-Former Soviet Union Scientific Cooperation Pro-gram, Project(P-105). （P-105）
