Effects of Different Water Stress Treatments on Core Germplasm Resources of Upland Cotton
In order to explore the response ability of upland cotton to drought under different water stress and screen the key drought-resistant indexes and the excellent drought-resistant germplasm resources,30 upland cotton core germplasms were selected as experimental materials,and compared with normal irrigation treatment during the whole growth period,2 water stress treatments,one water after sowing and one water at the flowering bollboll stage respectively,and 2 water stress treatments at the flowering bollboll stage were set up.The corresponding indexes were measured at bud stage,boll stage and boll opening stage by descriptive statistical analysis,difference analysis,principal component analysis and correlation analysis,the drought resistance of materials was evaluated by using drought resistance comprehensive evaluation value(D).The results showed that drought stress had different effects on the growth and development of different cotton materials,the D value of the treatment of watering one water after sowing and one water at flowering and boll stage was more discrete(0.285～0.774),which could more clearly distinguish between different varieties of drought resistance.Using D value,30 materials could be divided into 4 types:Type Ⅰ included 6 cotton varieties such as'Zhongmiansuo 41''Xinluzao 7'etc.and showed high drought resistance;Type Ⅱ included 11 cotton varieties such as'Jinmian 46''Xinluzao 31'etc.and showed middle drought resistance;Type m included 5 cotton varieties such as'Zhongmiansuo 17''Lu 1138'etc.and showed drought sensitive;Type Ⅳ included 8 cotton varieties such as'Xinluzhong 8''Jiumian 8'etc.and showed high sensitive to drought.The first node number of fruit branch,number of fruit branch,plant height,grain yield and lint percentage were sensitive to drought,which could be used as the key indexes for drought resistance evaluation of cotton.Above results could provide basis for cotton drought-resistant.
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