关键词: 棉花, 抗旱性, 全生育期, 农艺性状, 品种筛选

Abstract: To identify drought-resistant cotton varieties and screen the identification index  during the whole growth period, 238 cotton varieties with different drought resistance were treated with normal irrigation and drought stress during the whole growth period. The indexes of plant height, boll number, boll weight and soluble sugar content were selected, and drought resistance coefficient, principal component analysis, correlation analysis and cluster analysis were used to comprehensively evaluate the drought resistance of 238 cotton  resources and screen the drought resistance index. The results showed that drought stress had a significant effect on the growth of cotton during the whole growth period. Taking drought resistance (D value) as the main parameter, weighted drought resistance coefficient (WDC) and comprehensive drought resistance coefficient (CDC) as auxiliary parameters, 238 cotton variety resources could be divided into 5 grades, including 10 of typeⅠ (high drought resistance), 61 of typeⅡ (drought resistance), 84 of typeⅢ (moderate drought resistance), 78 of typeⅤ (sensitive type) and 5 of typeⅤ (highly sensitive type). Plant height, boll weight, lint percentage and soluble sugar content were more sensitive to drought stress than other indexes, which could be used as indicators for evaluating drought resistance of cotton variety resources during the whole growth period. Above results provided theoretical basis and basic materials for the breeding of new drought-resistant cotton varieties.

Key words: cotton, drought resistance, the whole growth period, agronomic traits, varieties screening