EVALUATION OF AGRO - BIOLOGICAL CHARACTERISTICS OF Platycodon grandiflorus (Jacq.) A. DC. LINE IN TAM DAO DISTRICT, VINH PHUC PROVINCE

Abstract

Platycodon grandiflorus (Jacq.) A. DC. is commonly used in traditional medicine. This study was conducted from August 2022 to October 2023 at the Tam Dao Medicinal Materials Research Station, National Institute of Medicinal Materials. Agronomic characteristics, productivity and medicinal quality of 50 selected Platycodon grandiflorus lines were evaluated. The experiment was arranged in a completely randomized block design with two replications. As a result, 10 promising Platycodon grandiflorus lines were identified based on criteria including strong growth and development, ovate to slightly round fruit shapes, narrow angles between main branches and trunk (approximately 19.55 - 38.55°), high individual yield (≥ 11,7 g/plant) and high actual yield (> 1.50 tons/ha). Each of the 10 lines showed platycodin D content above 0.1%, meeting the standards of the Vietnamese Pharmacopoeia V. These findings provide essential scientific data and elite materials for hybridization and breeding programs aimed at developing high - yield, high - active - ingredient Platycodon grandiflorus varieties, catering to both research needs and market demands.