Abstract:

Through determining the contents of secondary metabolites in Eucommia ulmoides Oliv. (Duzhong) leaves of different clones growing in the same site type, the result showed that the relationship between the growth features of individuals of Duzhong and the contents of secondary metabolites, and variance analysis of the contents of secondary metabolites is notable in different clones. The results show that the growth features of Duzhong (genetic factors) are important factors in regulating sythesis and accumulation of the secondary metabolites. Through analizing the relationship between the growth features of individuals and the contents of secondary metabolites, it is concluded that the contents of secondary metabolites in early budding individvals are higher than those in late ones, the gutta-percha contents in individuals with oval leaves are appareatly higher than those in ones with elliptic leaves, leaf area is negatively relevant to the gutta-percha content, the contents of geniposidio acid and geniposide in the smooth-bark type are higher than those in the rough-bark one; while sex, DBH, height and activity of nitrate reductase (NR) have no effects on the contents of secondary metabolites. These results provided theoretic basis for the selection of excellent clones.

Key words: Duzhong leaves, Secondary metabolites, Growth features