[Observation on the annual and seasonal changes of anatomic characteristics of the main root of Panax ginseng C.A. Meyer].

Annual dynamic of the main root of Panax ginseng shows that the cross-section of various tissues increases gradually with age, but the ratio of phloemxylem in cross-section decreases. Seasonal dynamic shows that cells of phellogen and cambium divide actively in June-July and gets retarded in August. Ecological conditions can influence annual and seasonal dynamics of the structure of the main root.