Towards a unified theory of plant photosynthesis and hydraulics

Jaideep Joshi*, Benjamin D. Stocker, Florian Hofhansl, Shuangxi Zhou, Ulf Dieckmann, Iain Colin Prentice

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    40 Citations (Scopus)
    59 Downloads (Pure)

    Abstract

    The global carbon and water cycles are governed by the coupling of CO2 and water vapour exchanges through the leaves of terrestrial plants, controlled by plant adaptations to balance carbon gains and hydraulic risks. We introduce a trait-based optimality theory that unifies the treatment of stomatal responses and biochemical acclimation of plants to environments changing on multiple timescales. Tested with experimental data from 18 species, our model successfully predicts the simultaneous decline in carbon assimilation rate, stomatal conductance and photosynthetic capacity during progressive soil drought. It also correctly predicts the dependencies of gas exchange on atmospheric vapour pressure deficit, temperature and CO2. Model predictions are also consistent with widely observed empirical patterns, such as the distribution of hydraulic strategies. Our unified theory opens new avenues for reliably modelling the interactive effects of drying soil and rising atmospheric CO2 on global photosynthesis and transpiration.

    Original languageEnglish
    Pages (from-to)1304-1316
    Number of pages13
    JournalNature Plants
    Volume8
    Issue number11
    Early online date27 Oct 2022
    DOIs
    Publication statusPublished - Nov 2022

    Bibliographical note

    Copyright the Author(s) 2022. Version archived for private and non-commercial use with the permission of the author/s and according to publisher conditions. For further rights please contact the publisher.

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