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Photosynthetic characteristics in flag leaves of high protein wheat cultivars under strong irradiance stress around noon

Song Jianmin, Tian Jitai, Zhao Shijie, Peng Tao, Dong Xinchun, Wang Xianze

Research of Plant Physiology,Shandong Agricultural University.Taian 271018,Shandong

Abstract

Under strong irradiance around noon, there was little difference in Pn between high and low protein wheat cultivars, but photorespiration and Fv/Fm of PSII of high protein wheat cultivars were higher, the value of Fv/Fm declined slightly, Pn declined faster after noon, as compared with low protein wheat cultivars. Those are mostly due to the facts that the active nitrogen metabolism and photorespiration in flag leaves of high protein wheat cultivars dissipated much excessive excited energy under high irradiance around noon and higher photorespiration depressed photosynthesis.

Key words: High protein wheat cultivars (Triticum aestivum L.);Photochemical efficiency of photosystem Ⅱ(Fv/Fm);Photorespiration;Nitrogen metabolism

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Citing This Article：

Song Jianmin, Tian Jitai, Zhao Shijie, Peng Tao, Dong Xinchun, Wang Xianze. Photosynthetic characteristics in flag leaves of high protein wheat cultivars under strong irradiance stress around noon. Acta Physiol Sin 1999; 51 (3): (in Chinese with English abstract).