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China's agricultural structure adjustment, vigorously develop the forage crops is one of the direction, and the development of the most important feed crop of alfalfa. Alfalfa industrialization development have good adaptability alfalfa varieties as a guarantee, the selection and layout is critical of alfalfa stress resistance of alfalfa varieties. In this study, combined with previous research, many overseas alfalfa varieties with good quality representative for the material, drought resistance, heat resistance, cold resistance, salt tolerance of different alfalfa varieties. 1. Drought resistance of different alfalfa varieties: indoor trials for PEG simulated drought stress determination of the water retention capacity of 21 alfalfa varieties Determination of membrane permeability and 24-hour alfalfa detached leaves; outdoor test for the natural drought alfalfa leaf stomatal diffusion resistance and transpiration Determination of strength. The correlation analysis showed that different alfalfa varieties and drought indicators: In the present study, the rate of cell damage, 24 hours leaves Paul hydraulics and relative diffusion resistance indicators can be used as a reasonable indicator of 21 Alfalfa Varieties identification. As of 21 Alfalfa Varieties cluster analysis, and different alfalfa varieties divided into high, medium and low resistance to three types. High drought-resistant alfalfa varieties: love Lin Z, the madrigal 401 Z Super Apollo, American Hybrid Bear winner, Aifeinite Z, the giant 201 Z; in drought-resistant alfalfa varieties for: Aiwei Lan Z, reformers Z Lobo, Mighty Z, Makino, guards, 302 Z, Xinjiang Daye shooters; Low drought-resistant varieties of alfalfa: Aibo, Zhongmu No. 1 super-13R, Paul Fung alfalfa, the German big leaf Bear, blue No. 1. 2. The heat resistance of different alfalfa varieties: the test first explore the different heat treatment time, different varieties of alfalfa leaf cell membrane permeability and cell injury rate. Studies have shown that stress time of 50 minutes on the identification of heat tolerance of different alfalfa varieties more appropriate; identified and the heat resistance of the 19 varieties of alfalfa, the results showed that: the Ailin Z Super 13R, guards 302 Z, Super Awa Luo and other varieties of heat resistance; to Germany large leaves bear, a giant 201 Z, Z, Bao Feng alfalfa and other varieties less heat resistance Aifeinite. 3. Cold hardiness of different alfalfa varieties: this study is based on alfalfa cotyledons section long measured different alfalfa fall dormancy index, and the first domestic several alfalfa varieties with fall dormancy identification; through the different varieties of alfalfa fall dormancy characteristics analysis: alfalfa fall dormancy alfalfa cotyledon node length divided index reasonable indicators; different varieties of fall dormancy alfalfa varieties divided according to the fall dormancy index, the half fall dormancy varieties and non-fall dormancy varieties; alfalfa fall dormancy characteristics show: fall dormancy alfalfa seedling growth slow, turning green in the coming year late, turning green growth is slow, its with strong cold resistance. Fall dormancy alfalfa varieties hardiness than half fall dormancy alfalfa varieties, the half fall dormancy alfalfa varieties hardiness higher than non-fall dormancy alfalfa varieties. 4. The salt tolerance of different alfalfa varieties: Nacl solution with different concentrations of the 19 varieties of alfalfa seed germination salt tolerance study. The results show that: the salt tolerance identification indexes to select a different tolerance identification results of different varieties of alfalfa confusion is not exactly the same: more salt-tolerant identification indicators analysis, the choice of some indicators of 19 first verifying the varieties of salt-tolerant Sexual cluster analysis; comprehensive analysis after the first confusion seed salt-tolerant force strength of division: Ailin + Z. Shooter, Makino, super-13R> first No. 1, Aibo, the giant 201 + Z> victor, reformers + Z, Aifeinite + Z, Lobo, super Apollo guards 302 + Z, American Hybrid Bear Ai Weilan Paul Fung first pedicle, Lan blind confusion, Almighty + Z, madrigal 401 + Z. 5. Comprehensive study of stress resistance of different varieties of blind confusion: on the basis of the above study, fuzzy clustering method of the Stress Resistance comprehensive evaluation of the 17 first confusion variety show that: Ailin 10 Z, the Super Apollo, Makino, winner and other the first pedicle varieties for high stress-resistant varieties, Bao Feng Shou Rong, Aibo, Almighty + Z Home protracted low-stress-resistant varieties.
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