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The role of SOD in protecting the photosynthetic apparatus of soybean leaves from midday high light stress

Zou Qi, Xu Changcheng, Zhao Shijie, Meng Qingwei

Plant Physiology and Bichemistry Laboratory, Shandong Agricultural University. Taian 271018,Shandong

Abstract

The protective effects of SOD in soybean leaves against midday high light stress were studied in Taian, Shandong. Midday depression in net photosynthetic rate (Pn) and apparent quantum yield (AQY) measured both at 21% O2 and at 2% O2 was observed in soybean leaves (Fig.2). The photorespiratory rate (Pr) increased rapidly for a few hours after sunrise, reaching a peak at about 11 A. M. (Fig.1). SOD activity increased during midday (Fig.3), displaying marked diurnal variation. Soybean plants treated with a DDTC (diethyldithiocarbamate) solution and exposed to full sunlight exhibited lower levels of Pn and AQY measured at 2% O2 over the day in comparison with plants untreated with DDTC.

Key words: Net photosynthetic rate;Apparant;Quantum yield;Photorespiratory rate; Superoxide dismucase

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Citing This Article：

Zou Qi, Xu Changcheng, Zhao Shijie, Meng Qingwei. The role of SOD in protecting the photosynthetic apparatus of soybean leaves from midday high light stress. Acta Physiol Sin 1995; 47 (4): (in Chinese with English abstract).