Rubisco deactivation and chloroplast electron transport rates co-limit photosynthesis above optimal leaf temperature in terrestrial plants.

Autor: Scafaro AP; Division of Plant Sciences, Research School of Biology, The Australian National University, Canberra, ACT, 2601, Australia. andrew.scafaro@anu.edu.au.; Centre for Entrepreneurial Agri-Technology, Gould Building, Australian National University, Canberra, 2601, Australia. andrew.scafaro@anu.edu.au., Posch BC; Department of Research, Collections and Conservation, Desert Botanical Garden, Phoenix, AZ, USA., Evans JR; Division of Plant Sciences, Research School of Biology, The Australian National University, Canberra, ACT, 2601, Australia., Farquhar GD; Division of Plant Sciences, Research School of Biology, The Australian National University, Canberra, ACT, 2601, Australia., Atkin OK; Division of Plant Sciences, Research School of Biology, The Australian National University, Canberra, ACT, 2601, Australia.; Centre for Entrepreneurial Agri-Technology, Gould Building, Australian National University, Canberra, 2601, Australia.
Jazyk: angličtina
Zdroj: Nature communications [Nat Commun] 2023 May 17; Vol. 14 (1), pp. 2820. Date of Electronic Publication: 2023 May 17.
DOI: 10.1038/s41467-023-38496-4
Abstrakt: Net photosynthetic CO 2 assimilation rate (A n ) decreases at leaf temperatures above a relatively mild optimum (T opt ) in most higher plants. This decline is often attributed to reduced CO 2 conductance, increased CO 2 loss from photorespiration and respiration, reduced chloroplast electron transport rate (J), or deactivation of Ribulose-1,5-bisphosphate Carboxylase Oxygenase (Rubisco). However, it is unclear which of these factors can best predict species independent declines in A n at high temperature. We show that independent of species, and on a global scale, the observed decline in A n with rising temperatures can be effectively accounted for by Rubisco deactivation and declines in J. Our finding that A n declines with Rubisco deactivation and J supports a coordinated down-regulation of Rubisco and chloroplast electron transport rates to heat stress. We provide a model that, in the absence of CO 2 supply limitations, can predict the response of photosynthesis to short-term increases in leaf temperature.
(© 2023. The Author(s).)
Databáze: MEDLINE
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