盐碱胁迫下羊草的生理特性与适应机制  

Physiological Characteristics and Adaptive Mechanism in Leymus chinensis under Salt and Alkali Stresses

作　　者：李新玲[1,2] 徐香玲[2] 张月学[1] 

机构地区：[1]东北林业大学博士后科研流动站黑龙江省农业科学院博士后科研工作站,黑尼汀哈尔滨150086 [2]哈尔滨师范大学生命科学与技术学院,黑龙江哈尔滨150025

出　　处：《安徽农业科学》2012年第28期13825-13827,13873,共4页Journal of Anhui Agricultural Sciences

基　　金：黑龙江省科技攻关项目(GA06B103-10)

摘　　要：[目的]探讨羊草在盐碱胁迫下的生理生化特性和K+、Na+含量的变化。[方法]在室内模拟不同pH盐碱土上种植羊草,并测定其生理生化指标和离子含量。[结果]随着土壤pH的逐渐升高和胁迫时间的延长,羊草体内的脯氨酸、可溶性蛋白、丙二醛的含量及氧化氢酶活性均随之增加,而后又逐渐降低。随着土壤pH的升高,羊草叶片的Na+含量逐渐增加,而K+含量逐渐减少,K+/Na+比值减小,但始终高于1。[结论]各项生理指标和K+、Na+含量的变化对维持羊草细胞的离子平衡起到了积极的调节作用。[Objective] To discuss the physiological and biochemical characteristics and K＋,Na＋ contents changes in Leymus chinensis under alkali-saline stress.[Method] Different pH saline-alkali soil was simulated to grow Leymus chinensis indoor,and measure its physiological index and ion concentration.[Result] With the gradual increasing soil pH and extending stress time,the proline,soluble protein,MDA contents and oxidation hydrogen enzyme activity in Leymus chinensis increased,and then gradually reduced.Na＋ contents gradually increased,and K＋ contents in Leymus chinensis blade gradually reduced with the pH rising,K＋ / Na＋ ratio decreased,but still higher than 1.[Conclusion]The changes of physiological indices,K＋ and Na＋ contents have a positive regulatory role in maintaining the ionic balance of Leymus chinensis cells.

关 键 词：羊草 盐碱胁迫 生理特性 适应机制 

分 类 号：S543.9[农业科学—作物学]