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《Northern Horticulture》 2015-04
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Response of Seed Germination to Salt and Drought Stress in Suaeda rigida

HAN Zhan-jiang;CHENG Long;YANG Zhao-ping;ZHANG Ling;SHI Qiang;College of Plant Science,Tarim University,Xinjiang Production and Construction Corps Key Laboratory of Protection and Utilization of Biological Resources in Tarim Basin;  
Taking Suaeda rigida Kung et G.L.Chu seed as materials,effects of different treatments of NaCl and PEG(molecular weight 6000)on seed germination characteristics were studied.The results showed that low concentration of salt(NaCl concentration 100 mmol/L)shorten significantly germination process of Suaeda rigida,whereas had no significant effect on its final germination rate.Medium or high salt concentration(NaCl concentrations were 200-500mmol/L)prolonged significantly average germination time and reduced final germination rate of Suaeda rigida.The mild drought(osmotic potential was-0.2 MPa)promoted significantly seed germination of Suaeda rigida,shorten average germination time,and reached quickly final germination rate to complete germination process.And its final germination rate was the highest,99%,significantly higher than the control.The moderate and severe drought(osmotic potentials were at range of-1.2to-0.4MPa)inhibited significantly seed germination of Suaeda rigida.As external osmotic potential reducing,final germination rate of Suaeda rigidseed showed a significant downward trend,average germination time was prolonged,reached final germination rate slowly,and time for completing germination process was also prolonged.When the external osmotic potential was-1.2MPa,its final germination rate was the lowest,only 28%.The threshold and limit of salt tolerant(NaCl)in Suaeda rigida seed were 394.30 mmol/L and 894.30 mmol/L,respectively.While the threshold and limit of drought tolerant(PEG-6000)in Suaeda rigidaseed were-0.88 MPa and-1.79 MPa,respectively.Suaeda rigidaseed showed a higher salt and drought tolerance at germination stage.
【Fund】: 国家自然科学基金资助项目(31360055);; 新疆生产建设兵团博士资金资助项目(2013BB008);; 塔里木大学校长基金资助项目(TDZKBS201204);; 国家级大学生创新创业训练计划资助项目(201310757006)
【CateGory Index】: Q945
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