过刊浏览

NaCl胁迫抑制玉米幼苗光合作用的可能机理

郭书奎, 赵可夫

山东师范大学逆境植物研究所.山东,济南 250014

摘要

用NaCl 100mmol/L处理玉米幼苗,216h内不同时间分别测叶片光合速率及其它生理指标,结果表明:随处理时间的延长,光合速率下降,气孔导度减小,细胞间隙CO_(2)浓度先降低后升高;叶片MDA、Cl~(-)、Pi及可溶性糖含量增加;质膜透性增大;Chl a/Chl b及Fv/Fm减小;MDH、PEPC酶活性降低。NaCl胁迫下光合作用降低的原因是多因素共同作用的结果,短时间内以气孔限制因素为主,长时间时以非气孔因素为主,在非气孔因素中活性氧的增加是主导因素。

关键词： 玉米幼苗; 光合速率; 膜透性; 反馈抑制; 光抑制; MDH; PEPC

The possible mechanisms of NaCl inhibit photosythesis of maize seedlings

Guo Shukui, Zhao Kefu

Institute of Plant Stress,Shandong Normal University.Jinan 250014,Shandong

Abstract

Maize seedlings were treated with 100 NaCl mmol/L, Photosynthetic rate and other parameters were measured at different time in 216 h after NaCl stress. The results show that the photosynthetic rate decreased with time, while stomatal conductance decreased, substomatal CO_(2) concentration decreased at first then increased gradually. MDA, Cl~(-), Pi and soluble carbohydrate contents increased, while Chl a/Chal b and Fv/Fm decreased, and the activity of MDH and PEPC decreased. In sum the reasons for inhibition of photosynthesis by NaCl stress are the results of interactions of many factors. The stomatal limitation is dominating in short period, non-stomatal inhibiting factor become the dominating ones in longer period gradually. The increase in active oxygen is the basic non-stomatal inhibiting factor.

Key words: Maize seedling;Photosynthetic rate;Membrane permeability;Feedback inhibition;Photoinhibition;MDH;PEPC

收稿日期：　　录用日期：

通讯作者：　　E-mail:

引用本文：

郭书奎, 赵可夫. NaCl胁迫抑制玉米幼苗光合作用的可能机理[J]. 生理学报 2001; 53 (6): .

Guo Shukui, Zhao Kefu. The possible mechanisms of NaCl inhibit photosythesis of maize seedlings. Acta Physiol Sin 2001; 53 (6): (in Chinese with English abstract).