Many plants growing in temperate regions can acquire tolerance to freezing through exposure to low, non-freezing temperatures, a phenomenon known as cold acclimation. For example, freezing tolerance in Arabidopsis leaves substantially increases duringthe first day of cold acclimation and reaches a maximum after 7 days (Gilmour et al., 1988; Uemura et al., 1995). Similarly, the survival of protoplasts isolated from Arabidopsis leaves after a freeze—thaw cycle significantly increases after 1 day of cold acclimation and gradually increases to a maximum following 7 days of cold acclimation (Kawamura and Uemura, 2003). These results indicate that the acquisition of freezing tolerance in Arabidopsis occurs during a short period of cold acclimation, i.e. within 1 day.
展开▼
