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Mitochondrial uncoupling protein silence is compromised in photosynthesis and redox poise

文献类型： 外文期刊

作者： Chen, Shuangchen 1 ; Jin, Wenjuan 1 ; Liu, Ai-rong 1 ; Liu, Zimei 2 ; Liu, Dilin 3 ; Xia, Xiaojian 2 ; Lin, Xiaomin 1 ;

作者机构： 1.Henan Univ Sci & Technol, Coll Forestry, Luoyang 471003, Peoples R China

2.Zhejiang Univ, Dept Hort, Hangzhou 310058, Zhejiang, Peoples R China

3.Agr Minist China, Key Lab Hort Plants Growth Dev & Qual Improvement, Hangzhou 310058, Zhejiang, Peoples R China

4.Guangdong Acad Agr Sci, Rice Res Inst, Guangzhou 510640, Guangdong, Peoples R China

关键词： Electron transport;Mitochondria uncoupling protein;Photosynthesis;Redox homeostasis;Rubisco activase;Tomato (Lycopersicum esculentum)

期刊名称：ACTA PHYSIOLOGIAE PLANTARUM （ 影响因子：2.354； 五年影响因子：2.711 ）

ISSN：

年卷期：

页码：

收录情况： SCI

摘要： Mitochondrial uncoupling proteins play important roles in generation of metabolic thermogenesis, response to stress situations, and regulation of energy metabolism. We demonstrated here that the absence of LeUCP in tomato inhibited photosynthesis using virus-induced gene-silencing approach. A significant decrease in the rate of CO2 assimilation in LeUCP-silencing plants was observed over a range of different light intensities. Absence of LeUCP resulted in lower net photosynthetic rate, light-saturated rate of the CO2 assimilation (A sat), maximum carboxylation rates (V cmax) and maximum RuBP regeneration rate (J max). Activities of ribulose-1,5-bisphosphate carboxylase/oxygenase Rubisco and stromal fructose-1,6-bisphosphatase and genes expression levels encoded Calvin cycle enzymes of LeUCP gene-silencing plants were inhibited. However, silencing of LeUCP gene had no effect on F v/F m, but decreased photochemical quenching and electron transport rate. Meanwhile, non-photochemical quenching and Je (PSII), the distribution of Je (PCR) and Je (PCO), the content of AsA, NAD, and the ratios of NAD+/NADH, AsA/DHA were significantly reduced with increased reactive oxygen species while GSH and GSSG were unaltered. Taken together, these results strongly suggest that LeUCP gene in tomato leaves is crucial in maintaining the redox poise of the mitochondrial electron transport chain to facilitate photosynthetic metabolism.

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