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Calcium signalling in stomatal cell guards.

Research output: Contribution to journalJournal article

  • Martin McAinsh
  • Julie E. Gray
  • Alistair M. Hetherington
  • Callum P. Leckie
  • Carl K.-Y. Ng
<mark>Journal publication date</mark>08/2000
<mark>Journal</mark>Biochemical Society Transactions
Issue number4
Number of pages6
Pages (from-to)476-481
<mark>Original language</mark>English


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.