THE BIOSYNTHESIS OF HYDROXYBENZOIC ACIDS IN HIGHER PLANTS
NATIONAL RESEARCH COUNCIL OF CANADA HALIFAX (NOVA SCOTIA) ATLANTIC REGIONAL LAB
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Radioactive para-hydroxybenzoic, vanillic and syringic acids were shown to be synthesized in a variety of plants from the corresponding hydroxycinnamic acids labelled in the beta-position. Decarboxylation of the hydroxybenzoic acids indicated that nearly all the activity was contained in the carboxyl carbons. In addition to the formation of C6-C1 acids by removal of a 2- carbon fragment from C6-C3 acids, some species were capable of O-methylating protocatechuic to vanillic acid or hydroxylating it to yield gallic acid. Demethoxylation of sinapic and dehydroxylation of caffeic acid occurred in some species. Ortho hydroxybenzoic acids were shown to arise from phenylalanine and cinnamic acid.