干旱胁迫对胡杨和灰叶胡杨光合作用及叶绿素荧光特性的影响  

The Effects of Drought Stress on Photosynthetic and Chlorophyll Fluorescence Characteristics of Populus euphratica and P. pruinosa

作　　者：李志军[1,2,3] 罗青红[3,4] 伍维模[1,2,3] 韩路[2,3] 

机构地区：[1]武汉大学水资源与水电工程科学国家重点实验室,湖北武汉430072 [2]新疆生产建设兵团塔里木盆地生物资源保护与利用重点实验室,新疆阿拉尔843300 [3]塔里木大学植物科技学院,新疆阿拉尔843300 [4]石河子大学生物工程学院,新疆石河子832003

出　　处：《干旱区研究》2009年第1期45-52,共8页Arid Zone Research

基　　金：水资源与水电工程科学国家重点实验室开放基金(2004B008);塔里木大学校长基金(2003-Z53)资助

摘　　要：采用盆栽试验,研究正常供水(土壤相对含水量70%~80%)、轻度干旱胁迫(50%~60%)和重度干旱胁迫(30%~40%)条件下2年生胡杨(Populus euphratica)和灰叶胡杨(P.pruinosa)的光合作用及叶绿素荧光特性。结果表明:在干旱胁迫进程中,轻度和重度干旱胁迫下胡杨、灰叶胡杨的净光合速率经历了急剧下降—缓慢回升—下降3个阶段。在相同的干旱胁迫处理下,光合作用及叶绿素荧光参数Pn,Gs,Ci,WUE,Fv/Fm,Fv/Fo,qP和NPQ胡杨明显高于灰叶胡杨,表明胡杨比灰叶胡杨对干旱胁迫具有更强的适应性。In this study,two-year-old Populus euphratica and P.pruinosa seedlings were grown in pots with varying levels of drought stress to evaluate the effects of drought on photosynthesis and chlorophyll fluorescence.Specifically,the seedlings were subjected to one of the three following water treatments for 48 h: 70%~80%(normal water supply),50%~60%(moderate drought stress) and 30%~40%(severe stress) of the field water holding capacity.The results revealed that the Pn values of P.euphratica and P.pruinosa passed ...

关 键 词：胡杨(Populus euphratica) 灰叶胡杨(Populus pruinosa) 干旱胁迫 光合作用 叶绿素荧光 

分 类 号：S792.11[农业科学—林木遗传育种]