Anthocyanin pigments in hypocotyls and cotyledons of Raphanus sativus L. seedlings. - Raphanus sativusL. seedlings growing in darkness do not form anthocyanins. Etiolated seedlings grown in CAP 10−4M, exposed 48 h after sowing to far red light accumulate large quantity of anthocyanins in hypocotyls and cotyledons. This amount of pigments is bigger than that formed by seedlings grown in water and irradiated with white light. However, in both cases, the only anthocyanidin present was pelargonidin and pelargonin the only detectable anthocyanin.