Abstract:

This study was conducted for fully understanding of gutta-percha content characters in samaras from different variance-types, which as a result provided theoretical guidance for selections of valuable resources and effective utilization of Eucommia ulmoides. Typical sample-tree selection and random selection were applied and integrated extraction was used for the gutta-percha content rate test in this study. The result showed that there existed remarkable differences of samara's shape and size among four main variance-types. These differences of samara's configuration and size indicated the growth characters among variances. Furthermore, significant differences of gutta-percha content rate in both kernel and pericarp were observed among variance-types. The highest gum content in kernel and pericap was obtained from while forma crackle lowest from forma split.

Key words: samara of Eucommia ulmoides, variance-type, gutta-percha content rate, variation dynamic