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中午强光胁迫下高蛋白小麦旗叶的光合特性

宋建民, 田纪泰, 赵世杰, 彭涛, 董新纯, 王宪泽

山东农业大学植物生理研究室.山东,泰安 271018

摘要

高、低蛋白小麦旗叶的净光合速率无显著差异,但中午强光胁迫下高蛋白小麦PSⅡ光化学效率(Fv/Fm)较高,PSⅡ Fv/Fm下降得较少,而净光合速率午间下降的幅度较大,原因可能是高蛋白小麦品系旗叶内氮素代谢活动旺盛(其代谢限速酶硝酸还原酶活性显著高于 蛋白品种),光呼吸作用较强,从而消耗了较多的过剩激发能,在一定程度上减轻了Fv/Fm的下降,而较强的光呼吸作用同时降低了光合速率。

关键词： 高蛋白小麦; PSⅡ光化学效率(Fv/Fm); 光呼吸; 氮素代谢

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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引用本文：

宋建民, 田纪泰, 赵世杰, 彭涛, 董新纯, 王宪泽. 中午强光胁迫下高蛋白小麦旗叶的光合特性[J]. 生理学报 1999; 51 (3): .

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).