Journal
PLANTS-BASEL
Volume 10, Issue 3, Pages -Publisher
MDPI
DOI: 10.3390/plants10030444
Keywords
alternative oxidase (AOX); cytochrome c (CYTc); oxygen isotope discrimination; metabolite profiling; photoperiod; primary metabolism
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Funding
- FONDECYT from the National Agency for Research and Development (ANID) [1191118]
- Agencia Nacional de Promocion Cientifica y Tecnologica [PICT-2018-01439]
- European Union [753301]
- 'Ramon y Cajal' contract [RYC2019-027244-I/AEI/10.13039/501100011033]
- European Social Fund
- Marie Curie Actions (MSCA) [753301] Funding Source: Marie Curie Actions (MSCA)
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This study reveals the coordination of different pathways of primary metabolism in plants to support growth adaptation under different photoperiods, with in vivo respiratory activities and stress signaling metabolites playing important roles in modulating energy constraints.
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 short- and 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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