Ca2+ signalling in stomatal guard cells

M R McAinsh, J E Gray, A M Hetherington, C P Leckie, C Ng

Research output: Contribution to journalArticle (Academic Journal)

47 Citations (Scopus)

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+](eyt)) hare 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)P-3-mediated Ca2+-mobilizing pathways. The central role of stimulus-induced increases in [Ca2+](eyt) in guard-cell signal transduction has been clearly demonstrated in experiments examining the effects of modulating increases in [Ca2+](eyt) on alterations in guard-cell turgor or the activity of ion channels that act as effecters 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+](eyt) exhibit unique spatial and temporal characteristics.

Original languageEnglish
Pages (from-to)476-481
Number of pages6
JournalBiochemical Society Transactions
Volume28
Publication statusPublished - Aug 2000

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