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Scientia Silvae Sinicae ›› 2018, Vol. 54 ›› Issue (8): 39-47.doi: 10.11707/j.1001-7488.20180805

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Variations of Endogenous Hormones and Polymines during Flowering Process in Male and Female Salix viminalis

Peng Xiangyong1,2, Cheng Yunhe1, Li Zhenjian1, Yu Yongchang1, Zou Junzhu1, Sun Zhenyuan1   

  1. 1. Key Laboratory of Tree Breeding and Cultivation of State Forestry Administration Research Institute of Forestry CAF Beijing 100091;
    2. School of Life Science, Qufu Normal University Qufu 273165
  • Received:2017-05-18 Revised:2017-07-29 Online:2018-08-25 Published:2018-08-18

Abstract: [Objective] In order to analyze the mechanism of flower organ formation and sex determination in dioecious plants, and provide theoretical support for the artificial regulation of flower organ formation and sex differentiation, the endogenous hormones and polyamines contents during the transition process from vegetative to reproductive growth were studied, and their regulation on flower bud differentiation and gender difference in male and female Salix. viminalis were investigated.[Method]The growth process of annual shoots of S. viminalis was divided into three stages:vegetative growth stage, flower bud physiological differentiation stage and flower bud morphological differentiation stage. In this paper, the 15-20-year-old female and male S. viminalis trees were used, and the contents of ABA, ZT, IAA, GA3, Put, Spm and Spd in the annual shoot tips were determined using HPLC-MS/MS Q-TRAP at different growth stages, and relationship between changes of the endogenous hormones and polyamines with gender differences were analyzed. [Result] In the process from the vegetative growth stage to the flower bud physiological differentiation stage, the contents of ABA, ZT, Put, Spm and Spd and ABA/GA3 and ZT/GA3 ratios in male and female S. viminalis, and the IAA/ZT ratio in the females significantly increased; the IAA/ABA ratio in male and female S. viminalis and the GA3 content in males significantly decreased. The contents of Put, Spm and Spd in male and female S. viminalis, ZT/GA3 ratio in males and IAA/ABA ratio in females significantly increased from the flower bud physiological differentiation stage to the flower bud morphological differentiation stage. There were significant gender differences between male and female in IAA, Spd contents and IAA/ABA ratio during S1 stage, in ABA, ZT, IAA, Spd contents and IAA/ABA ratio during S2 stage, and in ABA content and ABA/GA3, ZT/GA3, IAA/ABA, IAA/ZT ratios during S3 stage. [Conclusion] High levels of ABA, ZT, IAA, PAs, ABA/ GA3 and ZT/GA3 could initiate flower bud physiological differentiation and higher levels of PAs, ZT/GA3 and IAA/ABA could benefit the flower bud morphological differentiation in male and female S. viminalis. During the process of transition from vegetative growth to reproductive growth, although the trends of endogenous hormones and polyamines are similar in female and male S. viminalis, their contents of BA, ZT, IAA, Spd and IAA/ABA ratio appear significantly gender different at certain stages of development, which may be related to sex determination.

Key words: Salix viminalis, flowering, endogenous hormones, ploymines, gender difference

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