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Physiological mechanisms underlying reduced photosynthesis in wheat leaves grown in the field under conditions of nitrogen and water deficiency

作者：

Juan Kang;Yingying Chu;Geng Ma;Yanfei Zhang;Xiaoyan Zhang;Mao Wang;Hongfang Lü;Lifang Wang;Guozhang Kang;Dongyun Ma;Yingxin Xie;Chenyang Wan

单位：

National Engineering Research Center for Wheat, Henan Agricultural University, Zhengzhou 450046, Henan, China;College of Agronomy & State Key Laboratory of Wheat and Maize Crop Science, Henan Agricultural University, Zhengzhou 450046, Henan, China;National Engineering Research Center for Wheat, Henan Agricultural University, Zhengzhou 450046, Henan, Chin

关键词：

Wheat;Photosynthesis;Nitrogen;Water;Proteomic

摘要：

Reduced photosynthesis results directly from nitrogen or water deficiency in wheat plants, and leads to a decrease in grain yield. In this study, by measuring the effects of water and N deficiencies, both indi-vidually and combined, we characterized the responses of wheat (Triticum aestivum L. Yumai 49-198) plants to these two deficiencies using physiological measurements and comparative proteomics. Significant decreases in grain yield and leaf photosynthetic performance were observed in all deficiency conditions, and 106 photosynthetic proteins that showed responses were identified. Nitrogen deficiency induced the least change in photosynthetic proteins, and similar changes in most of these proteins were also observed for the combined nitrogen and water deficiencies. Water deficiency induced the lar-gest change in photosynthetic proteins and resulted in the lowest 1000-kernel weight. Severe decreases in photosynthesis in both the water-deficiency and combined N and water deficiency groups were reflected mainly in an imbalanced ATP/NADPH ratio associated with the light reaction, which influences carbon metabolism in the Calvin cycle. Photorespiration was respectively stimulated or inhibited by N or water deficiency, while suppression of photorespiratory flux and activation of nitrogen recycling were observed in the combined N and water deficiency treatments. Comparison of photosynthetic pro -teins between experimental sites suggested that precipitation affected linear electron flow in the pho-toreaction, and thus photosynthetic efficiency. Our results provide a baseline for future studies of the roles of these photosynthetic proteins in the response to N or water deficiency and their effect on 1000-kernel weight.(c) 2022 Crop Science Society of China and Institute of Crop Science, CAAS. Production and hosting by Elsevier B.V. on behalf of KeAi Communications Co., Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

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Physiological mechanisms underlying reduced photosynthesis in wheat leaves grown in the field under conditions of nitrogen and water deficiency

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