Temperature responses of the Rubisco maximum carbo

Authors: J Galmés M V Kapralov L O Copolovici C HermidaCarrera Ü Niinemets

Publish Date: 2014/12/17

Volume: 123, Issue: 2, Pages: 183-201

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Abstract

Temperature response of ribulose15bisphosphate carboxylase/oxygenase Rubisco catalytic properties directly determines the CO2 assimilation capacity of photosynthetic organisms as well as their survival in environments with different thermal conditions Despite unquestionable importance of Rubisco the comprehensive analysis summarizing temperature responses of Rubisco traits across lineages of carbonfixing organisms is lacking Here we present a review of the temperature responses of Rubisco carboxylase specific activity k textcattextc within and across domains of life In particular we consider the variability of temperature responses and their ecological physiological and evolutionary controls We observed over twofold differences in the energy of activation ΔH a among different groups of photosynthetic organisms and found significant differences between C3 plants from cool habitats C3 plants from warm habitats and C4 plants According to phylogenetically independent contrast analysis ΔH a was not related to the species optimum growth temperature T growth but was positively correlated with Rubisco specificity factor S c/o across all organisms However when only land plants were analyzed ΔH a was positively correlated with both T growth and S c/o indicating different trends for these traits in plants versus unicellular aquatic organisms such as algae and bacteria The optimum temperature T opt for k textcattextc correlated with S c/o for land plants and for all organisms pooled but the effect of T growth on T opt was driven by species phylogeny The overall phylogenetic signal was significant for all analyzed parameters stressing the importance of considering the evolutionary framework and accounting for shared ancestry when deciphering relationships between Rubisco kinetic parameters We argue that these findings have important implications for improving global photosynthesis modelsThe study was financially supported by the Spanish Ministry of Science and Innovation AGL200907999 and AGL201342364 the Estonian Ministry of Science and Education Institutional Grant IUT83 and the European Commission through the European Regional Fund The Center of Excellence in Environmental Adaptation We appreciate the insightful comments and discussions on the manuscript from three anonymous reviewers

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