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《Journal of Northwest A & F University(Natural Science Edition)》 2019-01
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Drought resistance of 5 alfalfa species at germination period under PEG simulated drought stress

CHENG Bo;HU Shengrong;GAO Yong;FAN Lu;ZHAI Bo;LIU Xiangjie;ZHANG Huimin;College of Desert Control,Inner Mongolia Agricultural University;The Inner Mongolia Autonomous Region Environmental Engineering Assessment Center;  
【Objective】This study analyzed drought resistance of 5alfalfa seeds in the germination period to breed alfalfa varieties suitable for the semi-arid areas in Inner Mongolia.【Method】The seeds of 5alfalfa varieties(Golden Empress,Zhongmu No.1,Algonquin,Werner,and Bingchi)were used for test under the arid environment simulated with different osmotic potentials of PEG-6000solution(0,-0.03,-0.10,-0.24,-0.42,and-0.94 MPa)to determine the 5indexes of germination rate,germination potential,germination index,germination number per day and drought resistance index at germination stage.Comprehensive evaluation of drought resistance was also conducted.【Result】The PEG solution with different os-motic potentials inhibited the germination of 5alfalfa seeds,and the inhibition effect was enhanced with the decrease of osmotic potential.When the osmotic potential was-0.94 MPa,only the germination rate of Golden Empress was above 50% and maintained normal germination ability.When the osmotic potential decreased from 0MPa to-0.42 MPa,the peak germination period of all the 5alfalfa seeds was delayed by about 5days,and the maximum number of germinating peaks at the germination peak was dropped by 10-20.When the osmotic potential reached-0.94 MPa,the number of generation seeds of all alfalfa varieties were less than 5per day.Based on the membership function method,the drought resistance during the germination period was in the order of Golden Empress WernerAlgonquinZhongmu No.1Bingchi.【Conclusion】In the semi-arid region in Inner Mongolia,the most suitable alfalfa variety for planting was Golden Empress,followed by Werner.
【Fund】: 国家重点研发计划专项“内蒙古干旱荒漠区沙化土地治理与沙产业技术研发与示范”-“绿洲盐碱湖区沙害防治关键技术研究与示范”(2016YFC0501003);; 中国博士后科学基金资助项目“半干旱地区苜蓿生物固氮对除草剂使用的响应机制”(2017M613264XB)
【CateGory Index】: S541.9
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