Seasonal and population variation in flavonoid and alliarinoside content of Alliaria petiolata.

摘要: Pieris napi oleracea, an indigenous butterfly in North America, lays eggs on Alliaria petiolata, invasive weed that was introduced from Europe. However, larval development plants different sources varies considerably. A. petiolata is a compulsive biennial, and its foliage rich apigenin flavonoids. We compared the chemistry of vegetative forms populations vicinity Ithaca, NY throughout year. Significant differences occurred number derivatives forms, seasonal variations amounts these compounds were found. have previously isolated two major compounds, alliarinoside [(2Z)-4-(beta-D-glucopyranosyloxy)-2-butenenitrile] (1) isovitexin-6-O"-beta-D-glucoside (3), which negatively affect P. oleracea larvae. Comparative analyses year showed their concentrations reached maxima twice annually. Foliage almost devoid flavonoids June-July. Thus, variation plant may account for observed rates survival Several identified by spectral studies.