Calcium signalling in stomatal cell guards.

McAinsh, Martin and Gray, Julie E. and Hetherington, Alistair M. and Leckie, Callum P. and Ng, Carl K.-Y. (2000) Calcium signalling in stomatal cell guards. Biochemical Society Transactions, 28 (4). pp. 476-481. ISSN 0300-5127

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Abstract

Ca2+ is a ubiquitous second messenger in the signal transduction pathway(s) by which stomatal guard cells respond to external stimuli. Increases in guard-cell cytosolic free Ca2+ concentration ([Ca2+]cyt) have been observed in response to stimuli that cause both stomatal opening and closure. In addition, several important components of Ca2+-based signalling pathways have been identified in guard cells, including the cADP-ribose and phospholipase C/Ins(1,4,5)P3-mediated Ca2+-mobilizing pathways. The central role of stimulus-induced increases in [Ca2+]cyt in guard-cell signal transduction has been clearly demonstrated in experiments examining the effects of modulating increases in [Ca2+]cyt on alterations in guard-cell turgor or the activity of ion channels that act as effectors in the guard-cell turgor response. In addition, the paradox that Ca2+ is involved in the transduction of signals that result in opposite end responses (stomatal opening and closure) might be accounted for by the generation of stimulus-specific Ca2+ signatures, such that increases in [Ca2+]cyt exhibit unique spatial and temporal characteristics.

Item Type:
Journal Article
Journal or Publication Title:
Biochemical Society Transactions
Uncontrolled Keywords:
/dk/atira/pure/researchoutput/libraryofcongress/qh301
Subjects:
ID Code:
8977
Deposited By:
Deposited On:
20 May 2008 10:37
Refereed?:
Yes
Published?:
Published
Last Modified:
06 May 2020 01:56