Plant polyphenols. 6. The flavonol glycosides of wild and cultivated potatoes

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Abstract
Nine flavonol glycosides have been found in potato flowers. They are the 3-glucosides, 3-rhamnosylglucosides, 3-diglucosides and 3 -glucosylrhamnosylglucosides of kampferol and quercetin and the 3-rhamnosylglucoside of myricetin. Kampferol 3-diglucoside 7-rhamnoside and kampferol 3-triglucoside 7-rhamnoside have been found in potato seeds. Luteolin 7-glucoside has been found specifically in the flowers of a wild species, Solanum stoloniferum. The distribution of the flavonol glycosides in wild and cultivated potato species is recorded. A gene controlling the transfer of glucose to quercetin 3-rhamnosylglucoside has been found. A scheme is proposed outlining the pathway of biosynthesis of the flavonol glycosides and anthocyanins of the potato.

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