The production of resveratrol and the viniferins by grapevines in response to ultraviolet irradiation
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TL;DR
The results of feeding radiolabelled precursors are consistent with the proposal that resveratrol, in common with other plant stilbenes, is biosynthesised by the phenylalanine-polymalonate pathway.
Abstract
The biosynthesis of resveratrol and the viniferins by grapevines in response to UV-irradiation has been studied. The action spectrum for the UV-irradiation induced production of resveratrol shows a maximum in the region 260–270 nm. This suggests that DNA is the photoreceptor for the response. It also provides an explanation for the fact that sunlight does not act as an inducer under field conditions. The results of feeding radiolabelled precursors are consistent with the proposal that resveratrol, in common with other plant stilbenes,is biosynthesised by the phenylalanine-polymalonate pathway. Direct evidence that resveratrol is the precursor of the viniferins was not obtained, but indirect evidence from time course studies and from biomimetic studies suggests that this is likely.