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午间强光胁迫下SOD对大豆叶片光合机构的保护作用

邹琦, 许长成, 赵世杰, 孟庆伟

山东农业大学植物生理生化研究室. 山东,泰安 271018

摘要

晴天田间大豆叶片Pn与Pr均表现出明显的日变化, Pn日变化曲线呈双峰型, 中午前后 降低。Pr随日照强度增加而增加, 至11时左右达最大值。普通空气及低氧空气中的AQY均在中午前后降低。SOD活性也有明显日变化, 最高值在16时左右。强光下喷施SOD抑制剂DDTC明显降低Pn及低氧空气中的AQY; 而在低于叶片光合作用饱和光强下喷施同样浓度DDTC则对Pn及低氧空气中的AQY无明显影响。

关键词： 净光合速率; 表现量子效率; 光呼吸速率; 超氧物歧化酶; 大豆

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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引用本文：

邹琦, 许长成, 赵世杰, 孟庆伟. 午间强光胁迫下SOD对大豆叶片光合机构的保护作用[J]. 生理学报 1995; 47 (4): .

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).