한국산 양지꽃족(Tribe Potentilleae: Rosaceae) 식물의 털과 표피상납질의 분류학적 중요성

Abstract

Using scanning electron microscope (SEM), we examined the trichomes on leaf and petiole and the epicuticular waxes on leaf surfaces for a total of 27 taxa representing two subtribes, Fragariinae and Potentillinae, of tribe Potentilleae (Rosaceae) in Korea. Four types of trichomes on adaxial and abaxial surface of leaves and petioles were identified. Type I (conical hirtellous) is the most common trichome type found in the majority of taxa in Fragariinae and Potentillinae. Type II (verruculose conical hirtellous) can be found only in Potentilla cryptotaeniae of sect. Conostylae of Potentillinae. Potentilla chinensis complex (sect. Conostylae) and P. egedii (sect. Letostylae) have type III trichome (crispate villous), while type IV (floccose villous) can be found in two species in sect. Conostylae, P. nivea and P. discolor. Both woolly hairs and conical hirtellous exist together in types III and IV. The same type of trichomes in leaves and petioles can be found across different subtribes and sections. In addition, different types of trichomes can be found even in a single species. Among the taxa which have type I trichome, the majority of subtribe Fragariinae and P. centrigrana and P. dickinsii complex have well developed epicuticular waxes on the surface of leaves. Sharing epicuticular waxes among the taxa across different subtribes appears to be correlated with their similar geographical distribution and ecological conditions. However, molecular phylogenetic study implies that the existence of epicuticular waxes could be also due to phylogenetic signal.