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Comparison of photosynthetic rates of wheat cultivars with different levels of grain protein content

Dong Caixia, Tian Jichun, Zhao Shijie

Institute of Soil Science,Chinese Academy of Sciences.Nanjing 210008,Jiangsu；China

Abstract

Cluster analysis shows that high protein content cultivars mostly had a comparatively low CO_(2) assimilation rates, while photosynthetic rates measured in terms of O_(2) evolution were not lower and, in some of them, were even higher than low protein content cultivars. During grain-filling period, CO_(2) assimilation and O_(2) evolution rates in high protein content cultivars declined more slowly than that in the high yielding cultivars. Such cultivars also senesced slowly, which was probably resulted from their relatively high nitrogen content and nitrate reductase activity inleaves.

Key words: Grain protein content;Grain yield;Photosynthetic CO_(2) assimilation rate;O_(2) evolution rate

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Citing This Article：

Dong Caixia, Tian Jichun, Zhao Shijie. Comparison of photosynthetic rates of wheat cultivars with different levels of grain protein content. Acta Physiol Sin 2001; 53 (5): (in Chinese with English abstract).