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Brassinosteroid Biosynthetic Gene CmDWF4 Regulates Bud Outgrowth in Chrysanthemum morifolium

Xianrong Fu, Aiping Song, Bo Peng, Song Li, Weixin Liu, Lingling Zhang, Jiafu Jiang, Sumei Chen, Fadi Chen*

State Key Laboratory of Crop Genetics and Germplasm Enhancement and Utilization, Key Laboratory of Landscaping, Key Laboratory of Flower Biology and Germplasm Innovation (South), Ministry of Agriculture and Rural Affairs, Key Laboratory of Biology of Ornamental Plants in East China, National Forestry and Grassland Administration, College of Horticulture, Nanjing Agricultural University, Nanjing, 210095, China

* Corresponding Author: Fadi Chen. Email: email

(This article belongs to the Special Issue: Advances in Molecular Genetics and Physiology towards a Better Understanding of Agricultural Crop Plants)

Phyton-International Journal of Experimental Botany 2023, 92(6), 1681-1694.


Brassinosteroids (BRs), a class of steroid phytohormones, play a critical role in plant growth and development. The DWF4 gene encodes a cytochrome P450 enzyme (CYP90B1), which is considered a rate-limiting enzyme in BR biosynthesis. Here, we identified a homologous gene of DWF4 in chrysanthemum, CmDWF4. This gene was predicted to encode 491 amino acid residues with a molecular weight of 56.2 kDa and an isoelectric point (pI) of 9.10. Overexpression of CmDWF4 in chrysanthemum was found to significantly increase growth rate, number, and length of lateral buds. Transcriptome analysis showed that multiple xyloglucan endotransglycosylase/hydrolase (XTH) family encoding genes associated with cell wall modification were up-regulated in CmDWF4-overexpressing lines. qRT-PCR assay confirmed the up-regulation of CmXTH6, CmXTH23, and CmXTH28 in CmDWF4-overexpression line. Overall, this work establishes a mechanism by which BR biosynthetic gene CmDWF4 promotes lateral bud outgrowth in chrysanthemum, possibly through regulating cell elongation and expansion.


Cite This Article

APA Style
Fu, X., Song, A., Peng, B., Li, S., Liu, W. et al. (2023). Brassinosteroid biosynthetic gene <i>cmdwf4</i> regulates bud outgrowth in <i>chrysanthemum morifolium</i>. Phyton-International Journal of Experimental Botany, 92(6), 1681-1694.
Vancouver Style
Fu X, Song A, Peng B, Li S, Liu W, Zhang L, et al. Brassinosteroid biosynthetic gene <i>cmdwf4</i> regulates bud outgrowth in <i>chrysanthemum morifolium</i>. Phyton-Int J Exp Bot. 2023;92(6):1681-1694
IEEE Style
X. Fu et al., "Brassinosteroid Biosynthetic Gene <i>CmDWF4</i> Regulates Bud Outgrowth in <i>Chrysanthemum morifolium</i>," Phyton-Int. J. Exp. Bot., vol. 92, no. 6, pp. 1681-1694. 2023.

cc This work is licensed under a Creative Commons Attribution 4.0 International License , which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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