NGHIÊN CỨU TUYỂN CHỌN GIỐNG ĐINH LĂNG (<i>Polyscias fruticosa </i>(L.) Harms) TẠI HÀ NỘI

A study was conducted to evaluate and select promising accessions of Polyscias fruticosa from five collected accessions with high medicinal yield and quality. The experiment was arranged in a randomized complete block design with three replications in Hanoi from 2019 to 2021. The results indicated that all varieties were shrubby growth habit, stems with irregularly distributed lenticels, and bipinnate to tripinnate compound leaves. VT-ĐL5.1 possessed broadly oval leaves with a blunt apex; VT-ĐL4.1 was the darkest green foliage; and VT-ĐL3.1 had the smallest leaf size. VT-ĐL5.1 (large-leaf genotype from Nam Định) exhibited the most vigorous growth in plant height and the highest dry matter accumulation, resulting in the greatest fresh root yield (6.54 ton/ha), followed by VT-ĐL4.1 (6.23 ton/ha) and VT-ĐL2.1 (6.14 ton/ ha). In terms of phytochemical composition, VT-ĐL4.1 recorded the highest oleanolic acid content (0.104%), whereas VT-ĐL2.1 showed a relatively high oleanolic acid content (0.094%) and extractive content (3.15%). Overall, the variety of VT-ĐL4.1 and VT-ĐL2.1 demonstrated superior agronomic performance and phytochemical quality, and are therefore recommended as potential varieties for large-scale cultivation and medicinal raw material production.