Enhanced photorespiration in transgenic rice over-expressing maize C-4 phosphoenolpyruvate carboxylase gene contributes to alleviating low nitrogen stress

文献类型： 外文期刊

第一作者： Tang, Yuting

作者： Tang, Yuting;Li, Xia;Lu, Wei;Tang, Yuting;Li, Xia;Wei, Xiaodong;Zhang, Qijun;Lv, Chuangen;Song, Ningxi;Li, Xia;Song, Ningxi

作者机构：

关键词： Low-nitrogen stress; Phosphoenolpyruvate carboxylase; Photorespiration; Transgenic C-4-PEPC-Overexpressing rice (Oryza sativa L.)

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： 2018 年 130 卷

页码：

收录情况： SCI

摘要： The objective of this study was to reveal the physiological and molecular mechanisms of low-nitrogen (N) tolerance in transgenic plant lines containing C-4 phosphoenolpyruvate carboxylase (C-4-PEPC) gene. The trans genic rice lines only over-expressing the maize C-4-PEPC) (PC) and their untransformed wild type, Kitaake (WT), were used in this study. At different N levels, the dry weight, total N content, carbon and N levels, photo respiration-related enzymatic activities, gene expression levels and photorespiration-related product accumulations were measured, as were the transgenic lines' agronomic traits. The PC line, having lower total N and higher soluble sugar contents, was more tolerant to low-N stress than WT, which was consistent with its higher PEPC and lower N-assimilation-related enzyme activity levels. The photosynthetic parameters, enzymatic activity levels, transcripts and products related to photorespiration in PC were also greater than in WT under low-N conditions. This study showed that increased carbon levels in transgenic rice lines overexpressing C-4-PEPC could help regulate the photorespiratory pathway under low-N conditions, conferring low-N tolerance and a higher grain yield per plant.

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