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Plastid carbonic anhydrases are essential for growth of Arabidopsis on ambient air but not for photosynthesis.

Plant physiology - 2 Mar 2026

Weerasooriya Hiruni N, Pabuayon Isaiah C M, Wang Xiaozhuo, Mehra Himanshu S, Kulkarni Nidhi, Ferrari Nicholas, Longstreth David J, Moroney James V

Abstract excerpt

The physiological role of chloroplast carbonic anhydrases (CAs) has long been debated, particularly in the context of photosynthesis. While early hypotheses proposed that CAs enhance CO2 assimilation by rapidly accessing the HCO3- pool, direct evidence has been lacking. In this study, we examined Arabidopsis (Arabidopsis thaliana) mutants lacking both chloroplast-localized βCA1 (AT3G01500) and βCA5 (AT4G33580) to...

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PMID: 41628905
DOI: 10.1093/plphys/kiag048

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