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Hydrogen peroxide regulated photosynthesis in C-4-pepc transgenic rice

文献类型: 外文期刊

作者: Ren, C. G. 1 ; Li, X. 1 ; Liu, X. L. 1 ; Wei, X. D. 1 ; Dai, C. C. 2 ;

作者机构: 1.Jiangsu Acad Agr Sci, Jiangsu High Qual Rice R&D Ctr, Inst Food Crops, Nanjing 210014, Jiangsu, Peoples R China

2.Nanjing Normal Univ, Coll Life Sci, Jiangsu Engn & Technol Res Ctr Ind Microbial Reso, Jiangsu Key Lab Microbes & Funct Genom, Nanjing 210023, Jiangsu, Peoples R China

3.Nanjing Agr Univ, Coll Life Sci, Nanjing 210095, Jiangsu, Peoples R China

关键词: Oryza sativa;C-4 pepc;Photosynthesis;1-Butanol;H2O2;Phospholipase D;Stomatal conductance

期刊名称:PLANT PHYSIOLOGY AND BIOCHEMISTRY ( 影响因子:4.27; 五年影响因子:4.816 )

ISSN: 0981-9428

年卷期: 2014 年 74 卷

页码:

收录情况: SCI

摘要: In this study, we investigated the photosynthetic physiological basis in 'PC' transgenic rice (Oryza sativa L.), showing high-level expression of the gene encoding C-4 phosphoenolpyruvate carboxylase (pepc), by hydrogen peroxide (H2O2). The C-4-PEPC gene (pepc) from maize in the transgenic rice plants was checked by PCR. Comparison of yield components and photosynthetic indices between PC and untransformed wild-type (WT) plants indicated that increased yield in PC was associated with higher net photosynthetic rate and higher activities of phosphoenolpyruvate carboxylase (PEPC). Both PC and WT plants were treated with 1 mmol L-1 abscisic acid (ABA), 0.04% 1-butanol (BA), 2 mmol L-1 neomycin (NS), or 2 mmol L-1 diphenyleneiodonium chloride (DPI) to investigate the relationship between photosynthesis and levels of H2O2 and phosphatidic acid. In both PC and WT, ABA induced H2O2 generation and simultaneous decrease in stomatal conductance (gs). PC plants treated with BA showed decreased H2O2 content and strongly increased gs within 2 h of treatment. Similar results were observed in response to DPI treatment in PC. However, WT did not observe the decrease of H2O2 during the treatments of BA and DPI. The reduced H2O2 content in PC caused by BA treatment differed to that induced by DPI because BA did not inhibit NADPH oxidase activities. While BA induced a larger PEPC activity in PC, and higher catalase activity as well. These results indicated that the regulation of endogenous H2O2 metabolism of PC could be helpful for enhancing photosynthetic capability. (C) 2013 Elsevier Masson SAS. All rights reserved.

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