Different Metabolic Roles for Alternative Oxidase in Leaves of Palustrine and Terrestrial Species
Del-Saz, Nestor Fernandez
Fernie, Alisdair R.
The alternative oxidase pathway (AOP) is associated with excess energy dissipation in leaves of terrestrial plants. To address whether this association is less important in palustrine plants, we compared the role of AOP in balancing energy and carbon metabolism in palustrine and terrestrial environments by identifying metabolic relationships between primary carbon metabolites and AOP in each habitat. We measured oxygen isotope discrimination during respiration, gas exchange, and metabolite profiles in aerial leaves of ten fern and angiosperm species belonging to five families organized as pairs of palustrine and terrestrial species. We performed a partial least square model combined with variable importance for projection to reveal relationships between the electron partitioning to the AOP (τa) and metabolite levels. Terrestrial plants showed higher values of net photosynthesis (AN) and τa, together with stronger metabolic relationships between τa and sugars, important for water conservation. Palustrine plants showed relationships between τa and metabolites related to the shikimate pathway and the GABA shunt, to be important for heterophylly. Excess energy dissipation via AOX is less crucial in palustrine environments than on land. The basis of this difference resides in the contrasting photosynthetic performance observed in each environment, thus reinforcing the importance of AOP for photosynthesis.
633 - Cultius i produccions
Is part of
Frontiers in Plant Science
Del-Saz, Nestor Fernandez, Cyril Douthe, Marc Carriquí, Jose Ortíz, Carolina Sanhueza, Alicia Rivas-Medina, and Allison McDonald et al. 2021. "Different Metabolic Roles For Alternative Oxidase In Leaves Of Palustrine And Terrestrial Species". Frontiers In Plant Science 12. doi:10.3389/fpls.2021.752795.
Grant agreement number
EC/H2020/753301/EU/Exploring the role of the mitochondrial alternative respiration in carotenoid biosynthesis during tomato fruit ripening/ARCATOM
MINECO-FEDER/Programa Estatal de generación del conocimiento y fortalecimiento científico y tecnológico del sistema I+D+I/PGC2018-093824-B-C41/ES/RAICES ECOFISIOLOGICAS Y EVOLUTIVAS DE LA TOLERANCIA A ESTRESES MULTIPLES EN PLANTAS/
MICIU/Programa Estatal de promoción del talento y su empleabilidad en I+D+I/RYC2019-027244-I/ES/Metagenomics and integrative biology tools to improve sustainable livestock systems/
Genòmica i Biotecnologia
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