Abstract:

The genus Eurya Thunb. was described as strict dioecy in most of the previous literatures，and gender variation was rarely observed. Gender variation was found in Eurya obtusifolia H. T. Chang during the field investigation. Leaves materials were collected from female，male and hermaphrodite plants. The contents of endogenous hormone（IAA，GA₃，ZR and ABA）were determined by HPLC，then hormone proportion and hormone dynamics were analyzed. The results showed that，the increase of GA₃ and ZR contents was beneficial to the development of male and hermaphrodite flowers. High level of IAA contents promoted the development of female flowers. ABA had uncertain effect on sexual differentiation. High ABA/ZR，IAA/ZR，GA₃/ZR ratios could promote the development of female flowers，while high ABA/IAA and GA₃/IAA ratios were beneficial to male flowers development.

Key words: Eurya obtusifolia, gender variation, leaf, endogenous hormone