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Modeling the Calcium Signaling in Stomatal Guard Cells under the Action of Abscisic Acid

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Abstract

A theoretical model of calcium signaling is presented that simulates oscillations of cytoplasmic calcium concentration ([Ca2+]cyt) in stomatal guard cells under the action of abscisic acid. The model is based on the kinetics of inositol 1,4,5-trisphosphate-sensitive calcium channels of endoplasmic reticulum and cyclic ADP-ribose-sensitive calcium channels of the tonoplast. The operation of two energy-dependent pumps—the Ca2+-ATPase of the endoplasmic reticulum and the Ca2+/H+ antiporter of the tonoplast—is also included in the model. It is shown that the removal of excessive Ca2+ from the cytoplasm by the tonoplast Ca2+/H+ antiporter is the main factor accounting for generation of [Ca2+]cyt oscillations at a wide range of ABA concentrations (0.01–1 μM). The long period of [Ca2+]cyt oscillations in plant cells is explained by a slow release from inhibition of inositol 1,4,5-trisphosphate-gated calcium channels.

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Authors and Affiliations

  1. Institute of Photobiology, National Academy of Sciences of Belarus, Akademicheskaya ul. 27, Minsk, 220072, Belarus

    V. G. Veresov, A. G. Kabak & I. D. Volotovsky

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  1. V. G. Veresov
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  2. A. G. Kabak
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  3. I. D. Volotovsky
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Veresov, V.G., Kabak, A.G. & Volotovsky, I.D. Modeling the Calcium Signaling in Stomatal Guard Cells under the Action of Abscisic Acid. Russian Journal of Plant Physiology 50, 573–579 (2003). https://doi.org/10.1023/A:1025686603389

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