摘要
盆栽控水模拟自然干旱胁迫条件下,研究了灰白滨藜2年生实生苗的保护酶活性和抗旱生理特性。结果表明:土壤含水率由23.0%下降到4.5%时,灰白滨藜叶片含水率、自由水含量和水势下降,水分饱和亏、束缚水含量和束缚水/自由水比值上升;SOD和CAT活性持续增强,当土壤含水率为9.0%时POD活性开始下降;MDA含量随着干旱胁迫程度的加剧而增加,O2·-产生速率呈现降低趋势,活性氧始终保持在较低水平。干旱胁迫下,灰白滨藜能够有效维持体内水分平衡,保护酶系统能够及时清除O2·-并有效减轻膜脂过氧化伤害,并且保护酶之间存在相互补偿功能。
2-year-old Atriplex canescens seedlings were potted to simulate natural drought stress condition;series of research work were taken to study their activity of protective enzymes and drought resistance physiology.The results showed that when the soil moisture content decreased from 23.0% to 4.5%,the leaf moisture,free water content and water potential decreased,meanwhile WSD,bound water and the value of bound water/free water increased;Activity of SOD and CAD increased continuously,but when the soil moisture content reached to9.0%,the activity of POD began to decrease;with the degree of drought stress getting worse,the content of MDA increased,the production rate of O2·-reduced and the active oxygen kept in a relatively low level.Under drought stress,Atriplex canescens itself could keep the inside moisture balance effectively,protective enzyme system could clean up O2·-in time and effectively relief the harm done by membrane lipids peroxide.There was also compensation among the protective enzymes.
出处
《干旱区资源与环境》
CSSCI
CSCD
北大核心
2010年第10期122-126,共5页
Journal of Arid Land Resources and Environment
基金
"948"滨藜优良品种及培育技术引进(2002-01)
工厂化育苗智能控制技术引进(2008-4-18)
国家"十一五"科技支撑(2006BAD26B01)资助
关键词
灰白滨藜
水分胁迫
保护酶
抗旱性
Atriplex canescens
water stress
protective enzymes
drought resistance
