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Symposium logo Calcium signalling by Sam Day. Transgenic Arabidopsis plant being chilled, the pseudocolour represents luminesence from the jellyfish protein aequorin when it reacts with calcium, courtesy of Marc Knight. Alternative conceptual models for the circadian regulation of physiology in the extensor (a) and flexor cells (b–e) of the pulvini of legumes from Webb, 2003. Localization of calmodulin (CaM) in tobacco cotyledon cells from Snedden and Fromm, 2001. Ca2+ fluxes and Ca2+-dependent events in cryptogein-treated tobacco cells from Lecourieux et al., 2006. Abscisic acid (ABA)- and hydrogen peroxide (H2O2)-induced changes in the cytosolic calcium concentration ([Ca2+]i) in the protoplasts of mesophyll cells from Hu et al., 2007.