作　　者： ; ; ; ;

机构地区： 华南农业大学林学院

出　　处： 《中南林业科技大学学报》 2012年第5期67-72,共6页

摘　　要： 对蒲桃Syzygium jambos、南五味子Kadsura longipedunculata、海南红豆Ormosia pinnata和灰木莲Mangliet iaglauca幼苗在不同干旱强度下的叶片气体交换参数进行了研究。结果表明,随着干旱胁迫时间的延长,4种幼苗的净光合速率(Pn)、气孔导度(Gs)、蒸腾速率(Tr)显著下降;蒲桃的胞间CO2浓度(Ci)显著降低,气孔限制值(Ls)下降后上升,南五味子和海南红豆的Ci都为下降后上升,Ls呈现上升后下降;灰木莲的Ci持续上升,而Ls持续下降。蒲桃的叶片水分利用率(WUE)上升,而其他幼苗则不断降低;主成分分析表明,幼苗耐干旱性顺序为蒲桃>南五味子>海南红豆>灰木莲。 The effects of drought stress on leaf gas exchange of four seedlings of Syzygium jambos, Kadsura longipedunculata, Ormosia pinnata and Mangliet iaglauca were studied. The results show that net photosynthetic rate （Pn）, stomatal conductance （Gs） and transpiration rate （Tr） of the four seedlings continuously decreased with increasing drought time. Intercellular carbon dioxide concentration（C3 of S. jambos decreased, whereas its stomatal limits （Ls） first decreased and then increased, whereas intercellular carbon dioxide concentration（Ci） decreased and then increased, the Ci ofK. longipedunculata, O. pinnata decreased followed by an increase; the Ci of M. iaglauca increased and its Ls decreased during drought experiment period. Water use efficiency （WUE） of S. jambos increased and that of other seedlings decreased with increasing drought time. The drought resistance of the four seedlings was evaluated by using principal component analysis, and the order of drought resistance was S. jambos〉K, longipedunculata〉O, pinnata〉M, iaglauca.

关 键 词： 干旱胁迫 幼苗 气体交换参数 主成分分析

领　　域： [农业科学] [农业科学] [生物学]