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Article Dans Une Revue Nature Communications Année : 2023

Light-independent regulation of algal photoprotection by CO2 availability

Serena Flori
Petra Redekop
Fabrizio Iacono
Giovanni Finazzi
Michael Hippler

Résumé

Photosynthetic algae have evolved mechanisms to cope with suboptimal light and CO 2 conditions. When light energy exceeds CO 2 fixation capacity, Chlamydomonas reinhardtii activates photoprotection, mediated by LHCSR1/3 and PSBS, and the CO 2 Concentrating Mechanism (CCM). How light and CO 2 signals converge to regulate these processes remains unclear. Here, we show that excess light activates photoprotection- and CCM-related genes by altering intracellular CO 2 concentrations and that depletion of CO 2 drives these responses, even in total darkness. High CO 2 levels, derived from respiration or impaired photosynthetic fixation, repress LHCSR3 /CCM genes while stabilizing the LHCSR1 protein. Finally, we show that the CCM regulator CIA5 also regulates photoprotection, controlling LHCSR3 and PSBS transcript accumulation while inhibiting LHCSR1 protein accumulation. This work has allowed us to dissect the effect of CO 2 and light on CCM and photoprotection, demonstrating that light often indirectly affects these processes by impacting intracellular CO 2 levels.
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Dates et versions

hal-04075888 , version 1 (20-04-2023)

Identifiants

Citer

M. Águila Ruiz-Sola, Serena Flori, Yizhong Yuan, Gaelle Villain, Emanuel Sanz-Luque, et al.. Light-independent regulation of algal photoprotection by CO2 availability. Nature Communications, 2023, 14 (1), pp.1977. ⟨10.1038/s41467-023-37800-6⟩. ⟨hal-04075888⟩
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