Protochlorophyllide Resynthesis in Dark-Grown Bean Leaves

Abstract

The protochlorophyllide content of dark-grown bean leaves was determined at various ages. It was detectable the second day after germination and reached a maximum on abouit the tenth day. The resynthesis of protochlorophyllide following a single irradiation and the rate of the 685 to 673 m, shift of the newly formed chlorophyll was examined. Leaves up to 5-days old show no lag phase in protochilorophyllide resynthesis. By the sixth day, a lag phase is evident which increases with age. The rate of the 685 to 673 my shift is similarly age dependent. In