A molecular pathway for CO2 response in Arabidopsis guard cells

Wang Tian, Congcong Hou, Zhijie Ren, Yajun Pan, Jinjin Jia, Haiwen Zhang, Fenglin Bai, Peng Zhang, Huifen Zhu, Yikun He, Shenglian Luo (), Legong Li () and Sheng Luan ()
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Wang Tian: College of Life Sciences, Capital Normal University
Congcong Hou: College of Life Sciences, Capital Normal University
Zhijie Ren: College of Life Sciences, Capital Normal University
Yajun Pan: College of Life Sciences, Capital Normal University
Jinjin Jia: College of Life Sciences, Capital Normal University
Haiwen Zhang: College of Life Sciences, Capital Normal University
Fenglin Bai: College of Life Sciences, Capital Normal University
Peng Zhang: College of Life Sciences, Capital Normal University
Huifen Zhu: College of Life Sciences, Capital Normal University
Yikun He: College of Life Sciences, Capital Normal University
Shenglian Luo: State key laboratory of chemo/Biosensing and chemometries, Hunan University
Legong Li: College of Life Sciences, Capital Normal University
Sheng Luan: University of California

Nature Communications, 2015, vol. 6, issue 1, 1-10

Abstract: Abstract Increasing carbon dioxide (CO2) levels in the atmosphere have caused global metabolic changes in diverse plant species. CO2 is not only a carbon donor for photosynthesis but also an environmental signal that regulates stomatal movements and thereby controls plant–water relationships and carbon metabolism. However, the mechanism underlying CO2 sensing in stomatal guard cells remains unclear. Here we report characterization of Arabidopsis RESISTANT TO HIGH CO2 (RHC1), a MATE-type transporter that links elevated CO2 concentration to repression of HT1, a protein kinase that negatively regulates CO2-induced stomatal closing. We also show that HT1 phosphorylates and inactivates OST1, a kinase which is essential for the activation of the SLAC1 anion channel and stomatal closing. Combining genetic, biochemical and electrophysiological evidence, we reconstituted the molecular relay from CO2 to SLAC1 activation, thus establishing a core pathway for CO2 signalling in plant guard cells.

Date: 2015
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DOI: 10.1038/ncomms7057

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