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《Agricultural Research in the Arid Areas》 2009-03
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Effects of complex saline-alkaline stress on seeds germination and physiological and biochemical parameters of oats seedlings

YANG Ke1,ZHANG Bao-jun1,HU Yin-gang1,WANG Shu-hua2,XUE Xiao-feng2(1.College of Agronomy,Northwest A & F University,Yangling,Shaanxi 712100,China;2.Dingbian County Science and Technology Bureau,Dingbian,Shaanxi 718600,China)  
The effects of complex saline-alkaline stress on seeds germination and the physiological and biochemical parameters of oats seedlings were studied in detail.The result showed that the germination rate,germination index,vigor index of seeds and seedling growth were both declined;membrane permeability and content of MDA increased as complex saline-alkali concentration was increased,and the increasing of membrane permeability and MDA content of Avena nuda L.was greater than that of Avena Sativa L.,which indicated that Avena nuda L.was more sensitive to salt than Avena Sativa L.,and the degree of harm by the saline-alkaline is greater than Avena Sativa L.too;as while the accumulation of free proline and soluble sugar increased,and Avena Sativa L.was increased significantly.The result showed that the osmotic regulation in Avena Sativa L.is mainly by means of synthesizing or accumulating organic solute,and when saline-alkali stress concentration exceeded 100～200 mmol/L,the free proline content and soluble sugar content declined instead,although the mechanism of this effect is not clear.By analyzing comprehensively these physiological indexes,the result indicated that the order of the alkali-saline tolerance of seeds of 2 varieties was Baiyan 7 Baiyan 1.
【Fund】： 教育部推广研究专项(XTG2008-4)
【CateGory Index】： S512.6
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