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Ng CKY, Mcainsh MR, Gray JE, Hunt L, Leckie CP, Mills L, Hetherington AM. Calcium-based signalling systems in guard cells. THE NEW PHYTOLOGIST 2001; 151:109-120. [PMID: 33873375 DOI: 10.1046/j.1469-8137.2001.00152.x] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
Calcium is a ubiquitous intracellular signal responsible for controlling numerous cellular processes in both plants and animals. As an example, Ca2+ has been shown to be a second messenger in the signal transduction pathways by which stomatal guard cells respond to external stimuli. Regulated increases in the cytosolic concentration of free calcium ions ([Ca2+ ]cyt ) in guard cells have been observed to be a common intermediate in many of the pathways leading to either opening or closing of the stomatal pore. This observation has prompted investigations into how specificity is encoded in the Ca2+ signal. It has been suggested that the key to generating stimulus-specific calcium signatures lies in the ability to access differentially the cellular machinery controlling calcium influx and release from intracellular stores. Several important components of the calcium-based signalling pathways have been identified in guard cells including cADPR, phospholipase C-InsP3 , InsP6 and H2 O2 . These data suggest that the pathways for intracellular mobilization of Ca2+ are evolutionarily conserved between plants and animals. ABBREVIATIONS: ABA, abscisic acid; [Ca2+ ]cyt , cytosolic free calcium concentration; [Ca2+ ]ext , external calcium concentration; IK,in ; inward-rectifying K+ currents; InsP3 , inositol-1,4,5-trisphosphate; InsP6 , inositol hexakisphosphate; PLC, phospholipase C; PLD, phospholipase D; PA, phosphatidic acid; H2 O2 , hydrogen peroxide; AAPK, ABA-activated serine-threonine protein kinase; cADPR, cyclic adenosine 5'-diphosphoribose; U73122, 1-(6-{[17â-3-methoxyestra-1,3,5(10)-trien-17-yl]amino}hexyl)-1H-pyrrole-2, 5-dione; RyR; ryanodine receptor; CICR; calcium-induced calcium-release; ICa , inward calcium current.
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Affiliation(s)
- CarL K-Y Ng
- Department of Biological Sciences, Institute of Environmental and Natural Sciences, Lancaster University, Bailrigg, Lancaster, LA1 4YQ, UK
| | - Martin R Mcainsh
- Department of Biological Sciences, Institute of Environmental and Natural Sciences, Lancaster University, Bailrigg, Lancaster, LA1 4YQ, UK
| | - Julie E Gray
- Department of Molecular Biology and Biotechnology, University of Sheffield, Sheffield, S10 2UH, UK
| | - LeE Hunt
- Department of Molecular Biology and Biotechnology, University of Sheffield, Sheffield, S10 2UH, UK
| | - Calum P Leckie
- Department of Physiological Sciences, The Medical School, University of Newcastle upon Tyne, NE2 4HH, UK
| | - Lewis Mills
- Department of Biological Sciences, Institute of Environmental and Natural Sciences, Lancaster University, Bailrigg, Lancaster, LA1 4YQ, UK
| | - Alistair M Hetherington
- Department of Biological Sciences, Institute of Environmental and Natural Sciences, Lancaster University, Bailrigg, Lancaster, LA1 4YQ, UK
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