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• W2138294967 startingPage "1140" @default.
• W2138294967 abstract "In responses to a number of environmental stimuli, changes of cytoplasmic [Ca(2+)](cyt) in stomatal guard cells play important roles in regulation of stomatal movements. In this study, the osmo-sensitive and stretch-activated (SA) Ca(2+) channels in the plasma membrane of Vicia faba guard cells are identified, and their regulation by osmotic changes and actin dynamics are characterized. The identified Ca(2+) channels were activated under hypotonic conditions at both whole-cell and single-channel levels. The channels were also activated by a stretch force directly applied to the membrane patches. The channel-mediated inward currents observed under hypotonic conditions or in the presence of a stretch force were blocked by the Ca(2+) channel inhibitor Gd(3+). Disruption of actin filaments activated SA Ca(2+) channels, whereas stabilization of actin filaments blocked the channel activation induced by stretch or hypotonic treatment, indicating that actin dynamics may mediate the stretch activation of these channels. In addition, [Ca(2+)](cyt) imaging demonstrated that both the hypotonic treatment and disruption of actin filaments induced significant Ca(2+) elevation in guard cell protoplasts, which is consistent with our electrophysiological results. It is concluded that stomatal guard cells may utilize SA Ca(2+) channels as osmo sensors, by which swelling of guard cells causes elevation of [Ca(2+)](cyt) and consequently inhibits overswelling of guard cells. This SA Ca(2+) channel-mediated negative feedback mechanism may coordinate with previously hypothesized positive feedback mechanisms and regulate stomatal movement in response to environmental changes." @default.
• W2138294967 created "2016-06-24" @default.
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• W2138294967 date "2007-01-26" @default.
• W2138294967 modified "2023-09-23" @default.
• W2138294967 title "Osmo-Sensitive and Stretch-Activated Calcium-Permeable Channels in <i>Vicia faba</i> Guard Cells Are Regulated by Actin Dynamics" @default.
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• W2138294967 doi "https://doi.org/10.1104/pp.106.091405" @default.
• W2138294967 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/1820927" @default.
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• W2138294967 hasPublicationYear "2007" @default.
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