Poster: Global change
Abs #
27: Modulation of cytosolic calcium pattern in stomatal carbon dioxide signal transduction
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Presenter: |
Young, Jared J, jyoung@biomail.ucsd.edu |
Authors | Young, Jared J (A) Grill, Erwin (B) Schroeder, Julian I (A) | | Affiliations: |
(A): Division of Biological Sciences, University of California, San Diego
(B): Bot. Institut, Technische Universitat Munchen
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Carbon dioxide modulates stomatal apertures, but the signal transduction mechanisms that underlie CO2 responses are poorly understood. Repetitive increases in [Ca2+]cyt have been shown to be important in stomatal ABA signal transduction (Allen et al., 2001). We show that Arabidopsis guard cells exposed to high carbon dioxide, which induces stomatal closing, or low carbon dioxide, which induces stomatal opening, exhibit [Ca2+]cyt elevations at different frequencies, and that switching between CO2 concentrations causes modulation of [Ca2+]cyt elevation frequencies. Furthermore, the ABA-insensitive gca2 mutant does not alter [Ca2+]cyt oscillation frequency with the [CO2]. In correlation, gas exchange experiments revealed reduced stomatal conductance changes in gca2 in response to changes in [CO2]. This suggests a basis for CO2 signaling in guard cells that includes modulation in the [Ca2+]cyt pattern.
Allen GJ, Chu SP, Harrington CL, Schumacher K, Hoffman T, Tang YY, Grill E, Schroeder JI. A defined range of guard cell calcium oscillation parameters encodes stomatal movements. Nature 411: 1053-1057 (2001)
