Cytochrome c Deficiency Differentially Affects the In Vivo Mitochondrial Electron Partitioning and Primary Metabolism Depending on the Photoperiod
Gonzalez, Daniel H.
Vallarino, José G.
Fernie, Alisdair R.
Del-Saz, Nestor Fernandez
Plant respiration provides metabolic flexibility under changing environmental conditions by modulating the activity of the nonphosphorylating alternative pathways from the mitochondrial electron transport chain, which bypass the main energy-producing components of the cytochrome oxidase pathway (COP). While adjustments in leaf primary metabolism induced by changes in day length are well studied, possible differences in the in vivo contribution of the COP and the alternative oxidase pathway (AOP) between different photoperiods remain unknown. In our study, in vivo electron partitioning between AOP and COP and expression analysis of respiratory components, photosynthesis, and the levels of primary metabolites were studied in leaves of wild-type (WT) plants and cytochrome c (CYTc) mutants, with reduced levels of COP components, under shortand long-day photoperiods. Our results clearly show that differences in AOP and COP in vivo activities between WT and cytc mutants depend on the photoperiod likely due to energy and stress signaling constraints. Parallel responses observed between in vivo respiratory activities, TCA cycle intermediates, amino acids, and stress signaling metabolites indicate the coordination of different pathways of primary metabolism to support growth adaptation under different photoperiods.
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Florez-Sarasa, Igor, Elina Welchen, Sofia Racca, Daniel H. Gonzalez, José G. Vallarino, Alisdair R. Fernie, Miquel Ribas-Carbo, and Nestor Fernandez Del-Saz. 2021. "Cytochrome C Deficiency Differentially Affects The In Vivo Mitochondrial Electron Partitioning And Primary Metabolism Depending On The Photoperiod". Plants 10 (3): 444. doi:10.3390/plants10030444.
Grant agreement number
EC/H2020/753301/EU/Exploring the role of the mitochondrial alternative respiration in carotenoid biosynthesis during tomato fruit ripening/ARCATOM
MICIU-FEDER/Programa Estatal de promoción del talento y su empleabilidad en I+D+I/RYC2019-027244-I/ES/ /
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