“…Circadian clock regulation of chilling tolerance has been studied extensively in cotton (McMillan and Rikin, 1990;Rikin, 1991Rikin, , 1992, which is a chilling-sensitive plant. Interestingly, cotton was found to be more tolerant of chilling stresses given during the dark phase than it was of those given during the light phase (Rikin et al, 1993).…”