The biosynthesis of gallic acid in a number of higher plants was investigated by using l-[U−14C]phenylalanine, (−)-[G−14C]shikimic acid, d-[1−14C]glucose and d-[6−14C]glucose as tracers. The results are compared with those obtained similarly for caffeic acid and are interpreted in terms of the dehydrogenation of 5-dehydroshikimic acid as a normal route of metabolism for gallic acid.

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