Localization of Prenylated Flavonoids in Sophora flavescens var. angustifolia Plants

Abstract

A histochemical analysis was carried out on the distribution of flavonoid derivatives in Sophora flavescens var. angustifolia plant. Prenylated flavonoids such as kushenol I, kurarinone, sophoraflavanone G and des-O-methylanhydroicaritin were mainly localized in the periderm (cork layers, and cork layer-like tissues scattered in parenchymatous tissues of the root system). Pterocarpan derivatives, maackiain, maackiain-3-O-glucoside (trifolirhizin) and its 6′-O-malonyl ester, were distributed in the cortex, cambium and pith as an ester form. In the aerial parts of the plant, neither pterocarpan nor prenylated flavonoid derivatives, but only flavone monoglucosides such as luteolin-7-O-glucoside and apigenin-7-O-glucoside were detected.