渗透胁迫下小麦幼苗根质膜ATP酶活性与膜透性的关系  

The Relationship between Plasma Membrane ATPase Activity and Membrane Permeability in Wheat Seedling Roots under Osmotic Stress

作　　者：刘君[1] 高俊凤[2] 王燕凌[1] 

机构地区：[1]新疆农业大学园艺学院,乌鲁木齐830052 [2]西北农林科技大学生命学院,杨凌712100

出　　处：《新疆农业大学学报》2006年第3期59-63,共5页Journal of Xinjiang Agricultural University

基　　金：国家自然科学基金项目(39370074;39070097)

摘　　要：经-1.0 MPa聚乙二醇PEG渗透胁迫处理72 h的小麦根系质膜透性可逆升高,抗旱品种(陕合6号)增幅小于干旱敏感品种(郑引1号),反复胁迫易导致质膜透性的不可逆伤害;PM H+-ATPase活性降低下降比质膜透性严重受伤害早,且不易恢复,可能是渗透胁迫伤害的原初作用点;PM Ca2+-ATPase活性强弱取决于小麦抗旱性强弱;渗透胁迫下的质膜透性变化与PM ATPase活性变化不呈现直接相关。The plasma membrane （PM） permeability increased reversibility in wheat roots under -1.0 MPa PEG osmotic stress after 72 hours, and the amplitude of changes in drought-resistant cultivar was more sensitive than that in the drought one. Repeated osmotic stress could cause the PM permeability irreversible injury. PM H^＋-ATPase activity dropped at the early stage under stress and was hard to recover. It may be the initial hurt site under osmotic stress. The strength of PM Ca^2＋-ATPase activity was related to drought resistance of wheat, but there was no considerable correlation between the changes of PM ATPase activity and PM permeability under osmotic stress.

关 键 词：小麦 渗透胁迫 质膜ATP酶 质膜透性 

分 类 号：S311[农业科学—作物栽培与耕作技术]