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Plant sulphur metabolism is stimulated by photorespiration

Abstract : Intense efforts have been devoted to describe the biochemical pathway of plant sulphur (S) assimilation from sulphate. However, essential information on metabolic regulation of S assimilation is still lacking, such as possible interactions between S assimilation, photosynthesis and photorespiration. In particular, does S assimilation scale with photosynthesis thus ensuring sufficient S provision for amino acids synthesis? This lack of knowledge is problematic because optimization of photosynthesis is a common target of crop breeding and furthermore, photosynthesis is stimulated by the inexorable increase in atmospheric CO2. Here, we used high-resolution 33S and 13C tracing technology with NMR and LC-MS to access direct measurement of metabolic fluxes in S assimilation, when photosynthesis and photorespiration are varied via the gaseous composition of the atmosphere (CO2, O2). We show that S assimilation is stimulated by photorespiratory metabolism and therefore, large photosynthetic fluxes appear to be detrimental to plant cell sulphur nutrition.
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https://hal.univ-angers.fr/hal-02557435
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Soumis le : mardi 26 mai 2020 - 15:41:24
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Cyril Abadie, Guillaume Tcherkez. Plant sulphur metabolism is stimulated by photorespiration. Communications Biology, Nature Publishing Group, 2019, 2 (1), pp.379. ⟨10.1038/s42003-019-0616-y⟩. ⟨hal-02557435⟩

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