Genetic Variation of Quercetin Glucoside Content in Onion (Allium cepa L.)

Quercetin glucoside content was investigated in the various genetic resources of onion (Allium cepa L.). Quercetin glucoside content of long-day cultivars was higher than that of short-day cultivars. Among the long-day cultivars, Rijnsburger cultivars from North Europe and their close relatives had higher quercetin glucoside content than those of Hokkaido a..