Abstract
The continuing rise in atmospheric CO2 causes stomatal pores in leaves to close and thus globally affects CO2 influx into plants, water use efficiency and leaf heat stress1,2,3,4. However, the CO2-binding proteins that control this response remain unknown. Moreover, which cell type responds to CO2, mesophyll or guard cells, and whether photosynthesis mediates this response are matters of debate5,6,7,8. We demonstrate that Arabidopsis thaliana double-mutant plants in the β-carbonic anhydrases βCA1 and βCA4 show impaired CO2-regulation of stomatal movements and increased stomatal density, but retain functional abscisic-acid and blue-light responses. βCA-mediated CO2-triggered stomatal movements are not, in first-order, linked to whole leaf photosynthesis and can function in guard cells. Furthermore, guard cell βca-overexpressing plants exhibit instantaneous enhanced water use efficiency. Guard cell expression of mammalian αCAII complements the reduced sensitivity of ca1 ca4 plants, showing that carbonic anhydrase-mediated catalysis is an important mechanism for βCA-mediated CO2-induced stomatal closure and patch clamp analyses indicate that CO2/HCO3− transfers the signal to anion channel regulation. These findings, together with ht1-2 (ref. 9) epistasis analysis demonstrate that carbonic anhydrases function early in the CO2 signalling pathway, which controls gas-exchange between plants and the atmosphere.
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Change history
16 May 2011
In the version of this letter initially published online and in print, the competing financial interests were incomplete.
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Acknowledgements
We thank M. Maktabi, J. Young and C. Engineer for preliminary analyses of βca mutants, R. Xu for assistance, S. Zeeman for suggestions and K. Iba (Kyushu University, Japan) for providing ht1-2 seeds. This research was supported by NSF (MCB0918220), NIH (GM060396) and in part by DOE (DE-FG02-03ER15449) grants (to J.I.S.) and by fellowships from the Swedish Research Council Formas (to M.I.-N.), the Deutsche Forschungsgemeinschaft (to M.B.), EMBO (to J.M.K.) and in part from the King Abdullah University of Science and Technology (KAUST; No. KUS-F1-021-31 to H.H.).
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J.I.S. conceived the project and proposed the experimental design. H.H., A. B.-D. and M.I.-N. performed most of the experiments and contributed equally to the work. M.B. performed CA activity analyses. S.X. performed patch clamp experiments. A.R. contributed to stomatal movement and stomatal index measurements. J.G. performed norflurazon experiments. J.M.K. analysed CO2/HCO3−-binding protein-encoding gene expression patterns and isolated the initial CA, PEPC and Rubisco T-DNA insertion lines. J.I.S., H.H., A.B.-D. and M.I.-N. wrote the paper.
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The University of California, San Diego, has submitted a patent form on behalf of J.I.S., M.I-N., J.M.K., H.H. and A.B.D. on aspects of the findings.
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Hu, H., Boisson-Dernier, A., Israelsson-Nordström, M. et al. Carbonic anhydrases are upstream regulators of CO2-controlled stomatal movements in guard cells. Nat Cell Biol 12, 87–93 (2010). https://doi.org/10.1038/ncb2009
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DOI: https://doi.org/10.1038/ncb2009
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