摘要
对海南红豆和南五味子的1年生实生苗在不同强度干旱胁迫下的叶片气体交换参数进行研究。结果表明:随着干旱胁迫的加强,南五味子和海南红豆的净光合速率(Pn)、气孔导度(Gs)、蒸腾速率(Tr)和叶片水分利用率(WUE)不断下降,而胞间CO2浓度(Ci)为先下降后上升,气孔限制值(Ls)呈现先上升后下降;重度胁迫时海南红豆的Pn、Gs、Tr和WUE均比南五味子大,说明前者对干旱有更强的适应性。
The effect of drought stress on leaf gas exchange of Ormosia pinnata and Kadsura longipedtmculata seedlings were studied with test material of one-year-old seelding. The result showed that, net photosynthetic rate （Pn）, stomatal conductance （ Gs ）, tran- spiration rate （Tr） , and water use efficiency （WUE） decreased with increasing drought stress, whereas intercellular carbon dioxide concentration （ Ci ） decreased and then increased and stomatal limits （Ls ） increased followed by a decrease. Pn, Gs, Tr, and WUE of O. pinnata were bighter in contrast with/C longipedunculata in severe stress, which indicates that O. pinnata has a better adapta- bility to drought stress compared with K. longipedunctdata.
出处
《湖南林业科技》
2012年第1期21-23,74,共4页
Hunan Forestry Science & Technology
基金
广东省林业局资助项目(F09054)
广东省林业科技创新专项资金项目(2008KJCX008-01)
关键词
干旱胁迫
海南红豆
南五味子
气体交换参数
drought stress Ormosia pinnata Kadsura longipedunculata gas exchange
