Study On Indexes System Of Drought Resistance Identification In Maize Inbred Lines

Fifteen maize inbred lines were selected to be the experiment materials, the morphology, growth, physiological indexes of maize drought resistance identification in germinating, seedling, blossom and filling period were tested and analyzed. The simply and true indexes systems of maize late inbred lines drought resistance identification were established analyzing with methods of gray correlation degree. The results were as follows:The embryo-bud length, embryo-shoot length, embryo-shoot number and dry weight of embryo-shoot of maize inbreed line decreased evidently under osmotic stress within germinating period. So the germination date was delayed, the germination rate and viability decreased. The germination percentage of seeds may be a major index of maize drought resistance identification within germinating period, the length of embryo-bud and dry weight of embryo-shoot may be secondary indexes.The number, volume, length of maize seedling, rate of shoot and seedling, leaf area decreased evidently under water stress within seedling stage; So the percentage of seedling survival after drought control decreased. The percentage of seedling survival may be the major index and the length; volume of root, rate of root and seedling may be the secondary indexes of maize drought resistance identification within seedling period.The barren ear tip and ASI increased under water stress within blossom period; the rate of photosynthesis and transpiration, plant height, ear length, ear diameter, row number, kernel number per row decreased evidently under water stress within blossom period; So the kernel number per ear and yield decreased. The DRI may be the major index under water stress by manual simulated- drought room within blossom period. The rate of photosynthesis and transpiration, ASI, ear length, row number per ear, kernel number per row may be the secondary indexes under water stress by manual simulated-drought room within blossom period.The number of yellow leafs increased, leafs became decrepit earlier under water stress by manual simulated-drought room within filling period. The chlorophyll content of maize leaves decreased. So the filling rate decreased and the length offilling period became short, kernel weight per 1000 declined. The DRI may be the major index within filling period, the number of yellow leafs, chlorophyll content of maize leaves and kernel weight per 1000 may be the secondary indexes under water stress by manual simulated-drought room within filling period.An indexes system of drought resistance identification of maize inbred line was established beyond this study result. The methods of osmotic stress, drought control and manual simulated-drought room can be the methods of water stress within germinating, seedling, blossom and filling period. The germination percentage of seeds, the percentage of seedling survival after drought control, DRI can be the major indexes of drought resistance identification within germinating, seedling, blossom and filling period. The length of embryo-bud and dry weight of embryo-shoot; the length, volume of root, rate of root and seedling; ASI, the rate of photosynthesis and transpiration, plant height, ear length, ear diameter, row number, kernel number per row; the number of yellow leafs, chlorophyll content of maize leaves and kernel weight per 1000 can be the secondary indexes.