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Identification of BR biosynthesis genes in cotton reveals that GhCPD-3 restores BR biosynthesis and mediates plant growth and development

文献类型： 外文期刊

作者： Liu, Le 1 ; Xie, Zongming 3 ; Lu, Lili 2 ; Qanmber, Ghulam 2 ; Chen, Guoquan 1 ; Li, Shengdong 1 ; Guo, Mengzhen 1 ; Sun, Zhuojing 4 ; Liu, Zhao 1 ; Yang, Zuoren 2 ;

作者机构： 1.Zhengzhou Univ, Zhengzhou Res Base, State Key Lab Cotton Biol, Sch Agr Sci, Zhengzhou 450001, Peoples R China

2.Chinese Acad Agr Sci, State Key Lab Cotton Biol, Inst Cotton Res, Anyang 455000, Peoples R China

3.Xinjiang Acad Agr & Reclamat Sci, Xinjiang Prod & Construct Grp, Key Lab Crop Germplasm Enhancement & Gene Resourc, Biotechnol Res Inst, Shihezi 832000, Xinjiang, Peoples R China

4.Minist Agr & Rural Affairs, Dev Ctr Sci & Technol, Beijing 100122, Peoples R China

期刊名称：PLANTA （ 影响因子：4.116； 五年影响因子：4.316 ）

ISSN： 0032-0935

年卷期： 2021 年 254 卷 4 期

页码：

收录情况： SCI

摘要： Main conclusion Brassinosteroid (BR) synthesis genes in different cotton species was comprehensively identified, and the participation of GhCPD-3 in the BR synthesis signaling pathway for regulating plant development was verified. Brassinosteroid is a natural steroidal phytohormone that plays fundamental roles in plant growth and development. In cotton, detailed characterization and functional validation of BR biosynthesis genes remain rare. Here, 16, 8 and 9 BR biosynthesis genes were identified in Gossypium hirsutum, Gossypium raimondii and Gossypium arboreum, respectively, and their phylogenetic relationships, gene structures, conserved motifs of the encoded proteins, chromosomal locations were determined and a synteny analysis was performed. Gossypium hirsutum and Arabidopsis BR biosynthesis genes closely clustered in the phylogenetic tree and fragment duplication was likely the primary cause promoting gene family expansion in G. hirsutum. Gene Ontology (GO) and KEGG (Kyoto Encyclopedia of Genes and Genomes) enrichment analysis showed their relevance as BR biosynthesis genes. GhCPD-3 was highly expressed in roots and stems and the loci of single nucleotide polymorphisms (SNPs) were significantly associated with these traits.Ectopic overexpression of GhCPD-3 in the cpd91 Arabidopsis mutant rescued the mutant phenotype by increasing plant height and leaf size in comparison to those of cpd91 and WT plants. Moreover, overexpressed GhCPD-3 in cpd91 mutants showed greater hypocotyl and root lengths than those of cpd9l and WT plants under light and dark conditions, respectively, indicating that BR actively promotes hypocotyl and root growth. Similar to CPD (CONSTITUTIVE PHOTOMORPHOGENIC DWARF), GhCPD-3 restores BR biosynthesis thereby mediating plant growth and development.

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