Calcium-based signalling systems in guard cells

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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 H2O2. These data suggest that the pathways for intracellular mobilization of Ca2+ are evolutionarily conserved between plants and animals.

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Ng, C. K. Y., Mcainsh, M. R., Gray, J. E., Le Hunt, E., Leckie, C. P., Mills, L., & Hetherington, A. M. (2001). Calcium-based signalling systems in guard cells. In New Phytologist (Vol. 151, pp. 109–120). https://doi.org/10.1046/j.1469-8137.2001.00152.x

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