Red-far red reversibility of anthocyanin synthesis in dark-grown and light-pretreated seedlings.

The rate of escape from red-far red reversibility for anthocyanin synthesis is lower in dark-grown than in light-pretreated seedlings of Brassica oleracea L. Red Acre, Secale cereale L. Cougar, and Lycopersicon esculentum Mill. Beefsteak. This observation is consistent with the suggestion that there might be two pools of phytochrome, a labile one, characterized by fast disappearance of phytochrome-far-red absorbing form, and a stable one, characterized by slow disappearance of phytochrome-far-red absorbing form, and that the proportion between the two pools might be different in dark-grown and light-pretreated seedlings.