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Letter

Nature Cell Biology 8, 391–397 (1 April 2006) | doi:10.1038/ncb1387

Arabidopsis HT1 kinase controls stomatal movements in response to CO2

Mimi Hashimoto , Juntaro Negi , Jared Young , Maria Israelsson , Julian I. Schroeder & Koh Iba

Guard cells, which form stomata in leaf epidermes, sense a multitude of environmental signals and integrate this information to regulate stomatal movements. Compared with the advanced understanding of light and water stress responses in guard cells, the molecular mechanisms that underlie stomatal CO2 signalling have remained relatively obscure.