Abstract
Abstract Dark-grown leaves were examined at early stages of greening to determine when photosynthetic electron transport, as indicated by light-induced fluorescence-yield changes, first appeared. The pigment content of the developing leaves was also followed. For the first 1.5 h of illumination there were no light-induced fluorescence-yield changes and the chlorophyll appeared as a single symmetrical absorption band at about 670 nm. After 2 h of illumination the fluorescence-yield changed slightly in response to actinic irradiation, chlorophyll b was detected, the chlorophyll a began to differentiate into chlorophyll a -670 and chlorophyll a -680, and C -705 appeared to be forming. All of these changes increased markedly on further illumination. It was concluded that the pigment development signified the organization of photosynthetic Systems 1 and 2 and that photosynthetic electron transport began as soon as the pigments of Systems 1 and 2 were present.
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