老芒麦种质对干旱胁迫的生理响应

Physiological Response of different Varieties ofElymus sibiricus to Drought Stress

摘要:

以3个老芒麦种质为材料,采用不同PEG浓度(0%、5%、10%、15%)模拟干旱胁迫,通过老芒麦苗期生理指标的变化,并用隶属函数对3种老芒麦抗旱性进行分析,研究老芒麦幼苗对干旱胁迫的生理响应。结果表明:随着干旱胁迫程度的增加,老芒麦种质叶片相对含水量降低;超氧化物歧化酶、过氧化物酶、过氧化氢酶等抗氧化物质均显著增加(P＜0.05),可溶性糖、可溶性蛋白、脯氨酸和丙二醛含量显著增加(P＜0.05);通过隶属函数分析,抗旱性由强到弱的顺序为新品系老芒麦(E02)＞呼伦贝尔老芒麦(E03)＞川草2号老芒麦(E01)。

Abstract:

Three varieties of E.sibiricus L.were exposed to different concentrations of PEG (0%,5%,10%,15%) to simulate drought stress.Physiological responses of Elymus sibiricus L.seedlings to drought stress were studied at seedling stage.Drought resistance of three varieties of E.sibiricus L.was analyzed by membership function.The results showed that along with the severity of drought stress,relative water content of leaves decreased;while a number of parameters including SOD,POD,CAT and other antioxidants,the content of soluble sugar,soluble protein,proline and malondialdehyde,all increased significantly (P＜0.05).According to the analysis of membership function,the order of drought resistance is as follows,new line (E02) ＞ Hulunbeier (E03) ＞ Chuancao 2 (E01).