Studies on quinic acid biosynthesis in Quercus pedunculata Ehrh. seedlings

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Abstract
The time course of 14C incorporation into shikimic (SA) and quinic acids (QA) was examined in Quercus pedunculata seedlings of different age fed with 14C glucose-6-phosphate (G6P) or 14C dehydroquinic acid (DHQ). QA was actively synthesized from G6P and exhibited the highest radioactivity among the organic acids. In contrast, DHQ, a good precursor of shikimate, was poor for quinate synthesis. In both cases, QA and SA presented parallel changes in specific radioactivities with time. The experimental results suggest that in oak leaves QA is formed by a route that is independent of the shikimate pathway and that this compound undergoes an important turnover. Moreover, depending on the physiological state of the plants, there are differences in the relative biosynthetic rates of the two acids.

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