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Title:: Salt Tolerance Assessment of Five Alfalfa Varieties Under Salt Stress at Germination Stage

Author(s):: CHENG Bo1; HU Shengrong2; GAO Yong1; FAN Lu1; YANG Shirong1; DANG Mengjiao1; (1.College of Desert Control,Inner Mongolia Agricultural University,Hohhot，Inner Mongolia 010018；2.The Inner Mongolia Autonomous Region Environmental Engineering Assessment Center,Hohhot，Inner Mongolia 010011)

Abstract:: The seeds of five varieties of alfalfa pasture(‘Golden Empress’‘Zhongmu No.1’‘Algonquin’‘Werner’‘Bing Chi’) commonly used in the salinealkali area of Inner Mongolia were used as test materials.Method for simulating salt environment using different concentrations of NaCl solution (0,25,75,125,175,250 mmol·L-1),the effects of different intensity of salt stress on the germination of five alfalfa seeds were studied.In order to provide a theoretical basis for breeding alfalfa varieties suitable for planting in the salinealkali region of Inner Mongolia.The results showed that different concentrations of NaCl inhibited the germination of five kinds of alfalfa seeds,and the germination peaks were also pushed down with the increase of NaCl concentration.The germination peaks of different varieties of alfalfa were different.When the NaCl concentration was gradually strengthened,the germination peaks of each variety changed to different degrees,and the highest germination number also decreased.According to the membership function method in fuzzy mathematics,the order of the salt tolerance of the five alfalfa seeds in the germination period was as follow ‘Algonquin’＞‘Zhongmu No.1’＞‘Golden Empress’＞‘Werner’＞‘Bing Chi’.