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PEPC of sugarcane regulated glutathione S-transferase and altered carbon-nitrogen metabolism under different N source concentrations in Oryza sativa

文献类型： 外文期刊

作者： Lian, Ling 1 ; Lin, Yuelong 1 ; Wei, Yidong 1 ; He, Wei 1 ; Cai, Qiuhua 1 ; Huang, Wei 3 ; Zheng, Yanmei 1 ; Xu, Huibin 1 ;

作者机构： 1.Fujian Acad Agr Sci, Rice Res Inst, Fuzhou 350019, Fujian, Peoples R China

2.Fujian Acad Agr Sci, State Key Lab Ecol Pest Control Fujian & Taiwan C, South China Base Natl Key Lab Hybrid Rice China, Minist Agr,Natl Engn Lab Rice,Key Lab Germplasm I, Fuzhou 350003, Fujian, Peoples R China

3.Fujian Acad Agr Sci, Inst Qual Stand & Testing Technol Agroprod, Fuzhou 350003, Fujian, Peoples R China

关键词： PEPC; Nitrogen-carbohydrate metabolism; Proteomic analysis; Gene expression; Enzyme activity; Phytohormone content

期刊名称：BMC PLANT BIOLOGY （ 影响因子：4.215； 五年影响因子：4.96 ）

ISSN： 1471-2229

年卷期： 2021 年 21 卷 1 期

页码：

收录情况： SCI

摘要： Background Phosphoenolpyruvate carboxylase (PEPC) plays an important role in the primary metabolism of higher plants. Several studies have revealed the critical importance of PEPC in the interaction of carbon and nitrogen metabolism. However, the function mechanism of PEPC in nitrogen metabolism is unclear and needs further investigation. Results This study indicates that transgenic rice expressing the sugarcane C4-PEPC gene displayed shorter primary roots and fewer crown roots at the seedling stage. However, total nitrogen content was significantly higher in transgenic rice than in wild type (WT) plants. Proteomic analysis revealed that there were more differentially expressed proteins (DEPs) responding to nitrogen changes in transgenic rice. In particular, the most enriched pathway "glutathione (GSH) metabolism", which mainly contains GSH S-transferase (GST), was identified in transgenic rice. The expression of endogenous PEPC, GST and several genes involved in the TCA cycle, glycolysis and nitrogen assimilation changed in transgenic rice. Correspondingly, the activity of enzymes including GST, citrate synthase, 6-phosphofructokinase, pyruvate kinase and ferredoxin-dependent glutamate synthase significantly changed. In addition, the levels of organic acids in the TCA cycle and carbohydrates including sucrose, starch and soluble sugar altered in transgenic rice under different nitrogen source concentrations. GSH that the substrate of GST and its components including glutamic acid, cysteine and glycine accumulated in transgenic rice. Moreover, the levels of phytohormones including indoleacetic acid (IAA), zeatin (ZT) and isopentenyladenosine (2ip) were lower in the roots of transgenic rice under total nutrients. Taken together, the phenotype, physiological and biochemical characteristics of transgenic rice expressing C-4-PEPC were different from WT under different nitrogen levels. Conclusions Our results revealed the possibility that PEPC affects nitrogen metabolism through regulating GST, which provide a new direction and concepts for the further study of the PEPC functional mechanism in nitrogen metabolism.

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