关键词: 陆地棉, 核心种质, 黄萎病, 抗性鉴定

Abstract: Cotton Verticillium wilt, caused by Verticillium dahliae Kleb., is a soil borne disease, which could  cause serious damage in the cotton production. The core germplasm represents the genetic diversity of the entire resource population. In this study, 419 core germplasm of upland cotton varieties (lines) were identified for Verticillium wilt resistance and selected for excellent varieties by quantitative injection of V. dahliae in hexagonal plastic bowl in an environment controlled artificial growth chamber. The results showed that there were a few resistant varieties in this 419 core collection, only 12 resistant varieties were identified, the disease index ranged from 21.67 to 25.00; 253 varieties displayed tolerant and the disease index ranged from 25.47 to 50.00, other varieties were susceptible to disease; there was no variety with immunity and high Verticillium wilt resistance; Verticillium wilt resistance of the modern varieties (the average disease index was 43.75) was better than that of middle-stage varieties (48.60) and early-stage varieties (51.55); the resistance of the varieties from the Yellow River cotton-growing areas(the average disease index was 43.21) were better than those of other cotton-growing areas or geographic origins. The screening of disease-resistant varieties in this study provided excellent germplasm resources for genetic improvement of cotton Verticillium wilt resistance breeding.

Key words: Gossypium hirsutum L., core collection, Verticillium wilt, resistance identification