不同叶龄杂交酸模叶片光合速率及PSⅡ光化学效率诱导对NaCl胁迫的响应  

Effects of NaCl Stress on Induction of Photosynthesis and PSⅡ Photochemistry Efficiency of Rumex K-1 Leaves with Different Age

作　　者：任丽丽[1] 高辉远[1] 

机构地区：[1]山东农业大学生命科学学院作物生物学国家重点实验室

出　　处：《西北植物学报》2008年第5期1014-1019,共6页Acta Botanica Boreali-Occidentalia Sinica

基　　金：国家自然科学基金资助项目(30571125);高校博士点基金资助项目;滨州学院青年人才创新工程科研基金(BZXYQNLG200719)

摘　　要：通过气体交换和叶绿素荧光分析方法研究了杂交酸模(Rumex K-1)幼叶、功能叶和衰老叶的光合速率及PSⅡ光化学效率诱导对NaCl胁迫的响应特征。结果表明,老叶的光合作用对盐胁迫最为敏感,幼叶次之,功能叶对盐胁迫的抗性最强。对照植株幼叶、功能叶和老叶的光合诱导速率相差不大,幼叶和功能叶光合诱导后期受气孔限制的影响。盐胁迫后幼叶和功能叶的光合诱导推迟,出现了一个新的光合适应阶段;老叶仍有部分电子传递功能,但已丧失碳同化能力。盐胁迫后气孔导度不再是叶片光合碳同化诱导过程的限制因素,不同叶龄叶片PSⅡ光化学效率启动所需时间远远小于光合速率启动所需时间,盐胁迫对叶片的PSⅡ光化学效率诱导过程几乎没有影响。Induction of photosynthesis and PS Ⅱ photochemistry efficiency in different age Rumex K-1 leaves under NaCl stress were studied by techniques of gas exchange and chlorophyll fluorescence quenching. The results showed that the photosynthesis in the old leaves was the most sensitive, whereas, that in the vigorous leaves was the most tolerant to the salt stress. The photosynthetic induction rates were similar in the different age leaves of the control plants,and there was stomatal limitation in the late stage of induction in young and vigorous leaves. After salt stress, the CO2 assimilation ability was completely inhibited in the old leaves though they still had a little electron transport. And a new phase for photosynthesis adaptation appeared in photosynthetic induction of the other two kinds of leaves. Stomatal conductance was no longer the limitation factor in the photosynthetic induction after salt stress. The induction of PS Ⅱ photochemistry efficiency was faster than that of photosynthesis in different age Rumex K-1 leaves. Salt stress had no effect on the induction of PS Ⅱ photochemistry efficiency.

关 键 词：RUMEX K-1 光合诱导 PSⅡ光化学效率 NACL胁迫 

分 类 号：Q945.79[生物学—植物学]