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Bulletin of Botanical Research ›› 2021, Vol. 41 ›› Issue (1): 37-43.doi: 10.7525/j.issn.1673-5102.2021.01.005

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Flower Bud Differentiation and Endogenous Hormone Changes of Rosa ‘Angela’

Zhi-Yuan LIU1,2,3, Li ZENG1(), Xi-Wu DU1,2,3, PENG-Yong-Zheng1, Yi-Wei TAO1, Yu-Qing LI1, Jun QIN2,3   

  1. 1.School of Agriculture and Biology,Shanghai Jiaotong University,Shanghai 200240
    2.Shanghai Chenshan Botanical Garden,Shanghai 201602
    3.Shanghai Engineering Research Center of Urban Tree Ecology and Applications,Shanghai 200020
  • Received:2020-02-28 Online:2021-01-20 Published:2021-01-05
  • Contact: Li ZENG E-mail:zljs@sjtu.edu.cn
  • About author:LIU Zhi-Yuan(1995—),female,master,innovation of germplasm resources and genetic breeding of ornamental plants.
  • Supported by:
    Science and Technology Project of Shanghai Greening and Landscape Administration(G192405);Project of Shanghai Agricultural Commission(3-6)


The experiment was conducted to explore the relationship between structure of flower buds and hormones content in Rosa ‘Angela’, and to regulate flowering, to improve landscape quality and breeding work. The flower bud differentiation was divided into five periods within 30 d. The growth cone was conical before the differentiation period. Then the cone became flat, five protrusions appeared around the growth cone at the sepal differentiation period. Multiple petal primordiums and stamen primordiums were respectively appeared around the growth cone during the flower bud differentiation. Several pistil primordiums were appeared at the base of growth cone at pistil differentiation period. The contents of ABA and CTK increased first and then decreased, which contents at sepal primordium differentiation period were significantly higher than other periods. The content of IAA increased gradually trend, and the content of GA decreased gradually. The ratio of IAA/GA and IAA/ABA showed a gradual increasing trend. The ratio of CTK/GA and(ABA+CTK)/GA at sepal primordium differentiation period were significantly higher than that before the differentiation period. The significant increasing of ABA and CTK contents at the sepal primordium differentiation period were related to flower bud induction. Low level of GA and decreasing of IAA were beneficial for flower bud differentiation. The increasing of CTK/GA and(ABA+CTK)/GA ratio at sepal primordium differentiation period were related to the flower bud induction, and high levels of IAA/ABA and IAA/GA ratio may relate to the further development of floral organ primordium.

Key words: Rose, flower bud differentiation, structure, endogenous hormone

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