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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

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Citing This Article：

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).