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Science 315 (5817): 1423-1426

Copyright © 2007 by the American Association for the Advancement of Science

Coupling Diurnal Cytosolic Ca2+ Oscillations to the CAS-IP3 Pathway in Arabidopsis

Ru-Hang Tang,1* Shengcheng Han,1* Hailei Zheng,2,3,1* Charles W. Cook,1 Christopher S. Choi,1 Todd E. Woerner,4 Robert B. Jackson,1 Zhen-Ming Pei1{dagger}

Abstract: Various signaling pathways rely on changes in cytosolic calcium ion concentration ([Ca2+]i). In plants, resting [Ca2+]i oscillates diurnally. We show that in Arabidopsis thaliana, [Ca2+]i oscillations are synchronized to extracellular Ca2+ concentration ([Ca2+]o) oscillations largely through the Ca2+-sensing receptor CAS. CAS regulates concentrations of inositol 1,4,5-trisphosphate (IP3), whichinturndirects release of Ca2+ from internal stores. The oscillating amplitudes of [Ca2+]o and [Ca2+]i are controlled by soil Ca2+ concentrations and transpiration rates. The phase and period of oscillations are likely determined by stomatal conductance. Thus, the internal concentration of Ca2+ in plant cells is constantly being actively revised.

1 Department of Biology, Duke University, Durham, NC 27708, USA.
2 Department of Biology, Xiamen University, Xiamen, Fujian 361005, China.
3 State Key Laboratory of Marine Environmental Science, Xiamen University, Xiamen, Fujian 361005, China.
4 Department of Chemistry, Duke University, Durham, NC 27708, USA.

* These authors contributed equally to this work.

{dagger} To whom correspondence should be addressed. E-mail: zpei{at}duke.edu

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