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Scientia Silvae Sinicae ›› 2020, Vol. 56 ›› Issue (9): 119-129.doi: 10.11707/j.1001-7488.20200914

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Research Progress on Flower Bud Differentiation of Trees

Chen Chen,Fangyuan Yu*   

  1. College of Forest Science, Nanjing Forestry University/Co-Innovation Center for Sustainable Forestry in Southern China Nanjing 210037
  • Received:2020-03-05 Online:2020-09-25 Published:2020-10-15
  • Contact: Fangyuan Yu

Abstract:

Flower bud differentiation is one of the key stages in the process of tree flowering and fruiting,and it directly affects the quantity and quality of fruits and seeds. Studying and revealing the rule of flower bud differentiation,and controlling flower bud differentiation with scientific measures are important bases for ensuring the quality and high yield of tree seeds. Flower bud differentiation includes physiological and morphological differentiation,and the processes are the results of the interaction and coordination of internal and external factors. The internal factors include plant hormones and nutrition. Among plant hormones,the GA is the most important factor. GA inhibits the flower bud differentiation of most broadleaf tree species while it enhances the flower bud differentiation of conifers. Carbohydrate,protein,lipid and mineral elements are nutrients closely related to flower bud differentiation. The most important nutrient is carbohydrate. Flower bud differentiation can be promoted in the condition of high concentration of carbohydrate. The external factors include water,temperature and light. It is generally recognized that moderate drought and sufficient sunlight can promote flower bud differentiation. Temperature has a great influence on flower bud differentiation but different species have different requirements for temperature. The theories related to flower bud differentiation include C/N ratio and hormone balance. At present,significant progress has been achieved on molecular regulation of flower bud differentiation. Mode of action of some important genes such as FT and TFL1 has been revealed. Understanding the mechanism of flower bud differentiation is helpful to make reasonable cultivation measures to regulate flowering period and quantity,and improve fruiting quality. This article reviewed the research progress on anatomical observation,the period of flower bud differentiation,factors influencing flower bud differentiation and related theories of flower bud differentiation in recent years. The future research prospect was also discussed in this paper.

Key words: flower bud differentiation, anatomical structure, influencing factors, molecular regulation

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