Stomata: Ca2+ in guard cell signalling

 

Reassessing roles for Ca²⁺ in guard cell signalling

by Blatt M.R. (1999)

in J. Exp. Bot.50, 989–999. –

CrossRef | CAS |

http://chemport.cas.org/cgi-bin/sdcgi?APP=ftslink&action=reflink&origin=wiley&version=1%2E0&coi=1%3aCAS%3a528%3aDyaK1MXksVehsrg%253D&md5=ed7fe32f8b5f1e8b7cacaa0e64bc2349

Abstract

A review with 114 refs. The complexity of cellular signals related to cytosolic free Ca2+ concentration is well-illustrated in stomatal guard cells.

Guard cells are unique as a higher plant cell model, because of the depth of knowledge to hand about ion channels at the plasma membrane and their regulation.

A large body of data indicates actions of Ca2+ in controlling the gating of K+ and Cl- channels, and there is now growing evidence for transients and oscillations in cytosolic free Ca2+ concentration based on a mechanism with some similarities to Ca2+-induced Ca2+ release in animals.

While these new discoveries offer a possible explanation for the specificity and diversity of Ca2+-dependent signalling, they raise a question about the immediate role(s) for Ca2+ as a primary signal intermediate in some instances.