JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2022, Vol. 46 ›› Issue (5): 75-80.doi: 10.12302/j.issn.1000-2006.202107032

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Photosynthesis and hormone study of male and hermaphroditic Osmanthus fragrans at different flowering stages

ZHANG Cheng1,2(), WANG Xiaoyan1,2(), WANG Xianrong1,2,*(), DUAN Yifan1,2,*(), ZHANG Min1,2, SHI Dawei1, ZHU Yue1,2, SONG Yanfeng1,2, CHAI Zihan1,2, LI Lan1,2   

  1. 1. College of Biology and the Environment, Co-Innovation Center for Sustainable Forestry in Southern China, Nanjing Forestry University, Nanjing 210037, China
    2. International Cultivar Registration Center for Osmanthus, Nanjing 210037, China
  • Received:2021-07-20 Revised:2021-11-28 Online:2022-09-30 Published:2022-10-19
  • Contact: WANG Xianrong,DUAN Yifan E-mail:chengz@njfu.edu.cn;wxyjessi@163.com;wangxianrong66@njfu.edu.cn;67181278@qq.com

Abstract:

【Objective】Osmanthus fragrans with both male and hermaphroditic plants, possesses an extremely rare breeding system of androdioecy. The photosynthetic characteristics and endogenous hormone content of O. fragrans at different flowering stages were measured, and the changes of photosynthesis and endogenous hormone content in male and hermaphroditic O. fragrans at different flowering stages were compared, providing references for the evaluation of growth adaptability and subsequent physiological and ecological research of male and hermaphroditic O. fragrans.【Method】The photosynthetic characteristics of male and hermaphroditic flowers at different flowering stages were measured by Li-6400XT photosynthetic measurement system, and five plant hormones including auxin (IAA), jasmonic acid (JA), abscisic acid (ABA), gibberellin (GA3) and zeatin nucleosides (ZRs) were measured by the enzyme-linked immunosorbent assay.【Result】The stomatal conductance and net photosynthetic rate of males were lower than that of hermaphroditic at different flowering stages. ABA had the highest hormone content among the five measured hormones. The content of JA continued to increase during the flowering period of male flowers and the content of ZRs continued to increase during the flowering period of hermaphroditic flowers.【Conclusion】Stomatal conductance was a key environmental factor affecting the net photosynthetic rate of O. fragrans, and was positively correlated with the net photosynthetic rate. The continuous accumulation of abscisic acid and jasmonic acid may lead to the mass abscission of male osmanthus petals. The accumulation of ZRs in the flowering stage of hermaphroditic flowers promoted the fruit development. The results provided basic physiological data for the different flowering stages of androdioecious O. fragrans, and provided references for the subsequent exploration of the mechanism of male flower petal abscission and fruit development.

Key words: Osmanthus fragrans, photosynthesis characteristics, plant hormone, androdioecy, flowering stage

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