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Scientia Silvae Sinicae ›› 2022, Vol. 58 ›› Issue (7): 144-155.doi: 10.11707/j.1001-7488.20220715

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Research Progress of Brassinolide in Regulating Plant Growth and Development

Chen Chen,Hong Chen,Ming Ni,Zihan Zhang,Fangyuan Yu*   

  1. College of Forest Science, Nanjing Forestry University/Co-Innovation Center for Sustainable Forestry in Southern China Nanjing 210037
  • Received:2021-08-10 Online:2022-07-25 Published:2022-11-03
  • Contact: Fangyuan Yu

Abstract:

As a new plant hormone, brassinolide (BR) has been widely used in agriculture and forestry due to its advantages of high efficiency, environmental protection and wide spectrum. BR can promote the elongation and division of plant cells, enhance the photosynthetic capacity of leaves, and regulate the development of roots, thereby improving plant growth and development, and increasing the yield. BR significantly affects the reproductive growth of plants, by regulating the flowering time of plants, prolonging the flowering period, and increasing the number of flowers. However, a few studies have pointed out that BR has an inhibitory effect on flowering. BR could promote the fruit setting and improve the seed and fruit quality. After the plants are subjected to external stress, the antioxidant system of plants is damaged, and the growth and development of plants are retarded. Spraying BR could increase the activity of antioxidant enzymes, reduce the content of malondialdehyde, and enhance the stress resistance of plants. With the innovation of research method and facilities, the mechanism of BR signal transduction, and the functions and mechanisms of BR-related genes are revealed. BR signal transduction is regulated by kinases, receptor proteins, transcription factors and other elements. BRI1/BAK1 can recognize BR molecules on the surface of cell membrane. Under the action of protein kinases (BSK1, BSU1, BIN2, CDG1), transcription factors (BZR1, BES1) are activated to regulate the expression of BR responsive genes. Genes related to BR biosynthesis and signal transduction, such as DAS5, DET2, DWF4, CPD and BAK1 have been identified, cloned, and transformed into different species using transgenic technology, which could improve the growth of transgenic plants and enhance the resistance of plants to adversity. This paper reviews the research progress in the fields of BR regulation of plant vegetative and reproductive growth, the enhancement of plant stress tolerance, and molecular mechanism of BR, discusses the existing problems in BR research, and prospectes the future research direction of BR.

Key words: brassinolide, vegetative growth, reproductive growth, stress resistance, molecular mechanism

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