The porphyrin and phorbin biosynthetic activity of etiolated cucumber (Cucumis sativus, L.) cotyledons was compared to that of cotyledonary homogenates. Etiolated The terminology proposed by Kirk and Tilney-Basset is followed in this paper: the term "protochlorophyllide ester" denotes protochlorophyllide phytyl ester, while the term "protochlorophyll" denotes the mixture of protochlorophyllide and protochlorophyllide phytyl ester which accumulates in etiolated tissues.
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