Key points are not available for this paper at this time.
Heather Knight, Anthony J. Trewavas, Marc R. Knight, Cold Calcium Signaling in Arabidopsis Involves Two Cellular Pools and a Change in Calcium Signature after Acclimation, The Plant Cell, Vol. 8, No. 3 (Mar., 1996), pp. 489-503
Knight et al. (Fri,) studied this question.