The electrolyte leakage measurements indicate a positive relationship
between low growth temperature and short photoperiod
in combination with cold acclimatisation periods on frost tolerance
(Fig. 1). In a recent study of Arabidopsis, Lee and Thomashow
(2012) reported that long, warm days were accompanied by a
repression of activity in the C-repeat binding factor pathway,
responsible for cold acclimatisation, and that repression is relieved
as day length shortens, thereby increasing frost tolerance.