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

Author

Listed:
  • Andrew P. Scafaro

    (The Australian National University
    Centre for Entrepreneurial Agri-Technology, Gould Building, Australian National University)

  • Bradley C. Posch

    (Desert Botanical Garden)

  • John R. Evans

    (The Australian National University)

  • Graham D. Farquhar

    (The Australian National University)

  • Owen K. Atkin

    (The Australian National University
    Centre for Entrepreneurial Agri-Technology, Gould Building, Australian National University)

Abstract

Net photosynthetic CO2 assimilation rate (An) decreases at leaf temperatures above a relatively mild optimum (Topt) in most higher plants. This decline is often attributed to reduced CO2 conductance, increased CO2 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 An at high temperature. We show that independent of species, and on a global scale, the observed decline in An with rising temperatures can be effectively accounted for by Rubisco deactivation and declines in J. Our finding that An 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 CO2 supply limitations, can predict the response of photosynthesis to short-term increases in leaf temperature.

Suggested Citation

  • Andrew P. Scafaro & Bradley C. Posch & John R. Evans & Graham D. Farquhar & Owen K. Atkin, 2023. "Rubisco deactivation and chloroplast electron transport rates co-limit photosynthesis above optimal leaf temperature in terrestrial plants," Nature Communications, Nature, vol. 14(1), pages 1-10, December.
    • Handle: RePEc:nat:natcom:v:14:y:2023:i:1:d:10.1038_s41467-023-38496-4
    DOI: 10.1038/s41467-023-38496-4
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    References listed on IDEAS

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    1. Yan-Shih Lin & Belinda E. Medlyn & Remko A. Duursma & I. Colin Prentice & Han Wang & Sofia Baig & Derek Eamus & Victor Resco de Dios & Patrick Mitchell & David S. Ellsworth & Maarten Op de Beeck & Gör, 2015. "Optimal stomatal behaviour around the world," Nature Climate Change, Nature, vol. 5(5), pages 459-464, May.
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    Cited by:

    1. Mirindi Eric Dusenge & Jeffrey M. Warren & Peter B. Reich & Eric J. Ward & Bridget K. Murphy & Artur Stefanski & Raimundo Bermudez & Marisol Cruz & David A. McLennan & Anthony W. King & Rebecca A. Mon, 2023. "Boreal conifers maintain carbon uptake with warming despite failure to track optimal temperatures," Nature Communications, Nature, vol. 14(1), pages 1-11, December.

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