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Physiological characteristics and metabolomics of transgenic wheat containing the maize C4 phosphoenolpyruvate carboxylase (PEPC) gene under high temperature stress

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Abstract

In this paper, two transgenic wheat lines, PC27 and PC51, containing the maize PEPC gene and its wild-type (WT) were used as experimental material to study the effects of high temperature on their photosynthetic physiological characteristics and metabolome. The results showed that transgenic wheat lines had higher photosynthetic rate (P n) than WT under non-stress treatment (NT) and high temperature stress treatment (HT), and more significantly under HT. The change trends of F v/F m, Ф PSII, and q P were similar to P n, whereas that of non-photochemical quenching (NPQ) was the opposite. Compared with WT, no differences in chlorophyll content between the transgenic wheat and WT were observed under NT, but two transgenic lines had relatively higher contents than WT under HT. The change trends of Chlorophyll a/b radio, the decreased values of F m, Wk, and Vj, and the activity of the antioxidant enzyme were consistent with the chlorophyll content. Compared with WT, transgenic wheat lines exhibited lower rate of superoxide anion production, H2O2 and malondialdehyde content under HT, and no significant differences were observed under NT. The expression pattern of the ZmPEPC gene and wheat endogenous photosynthesis-related genes were in agreement with that of P n. Compared with WT, about 13 different metabolites including one organic acid, six amino acids, four sugars, and two polyols were identified under NT; 25 different metabolites including six organic acids, 12 amino acids, four sugars, and three polyols were identified under HT. Collectively, our results indicate that ZmPEPC gene can enhance photochemical and antioxidant enzyme activity, upregulate the expression of photosynthesis-related genes, delay degradation of chlorophyll, change contents of proline and other metabolites in wheat, and ultimately improves its heat tolerance.

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Acknowledgments

The National Natural Science Foundation of China (no. 31371707), Genetically Modified Organisms Breeding Major Projects of China (no. 2011ZX08002-003), China Agriculture Research System (no.CARS-3-1-9) and Fundamental Research and Advanced Technology Project of Henan Province (no.162300410163) supported this work.

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Authors and Affiliations

  1. College of Agronomy, Henan Agricultural University, Zhengzhou, Henan, 450002, China

    Xueli Qi

  2. Wheat Research Institute, Henan Academy of Agricultural Sciences, Zhengzhou, Henan, 450002, China

    Xueli Qi, Weigang Xu, Jianzhou Zhang, Rui Guo, Mingzhong Zhao, Lin Hu, Huiwei Wang, Haibin Dong & Yan Li

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  1. Xueli Qi
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Correspondence to Weigang Xu.

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Qi, X., Xu, W., Zhang, J. et al. Physiological characteristics and metabolomics of transgenic wheat containing the maize C4 phosphoenolpyruvate carboxylase (PEPC) gene under high temperature stress. Protoplasma 254, 1017–1030 (2017). https://doi.org/10.1007/s00709-016-1010-y

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