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Identification of the phosphatidylethanolamine-binding protein gene family in wintersweet (Chimonanthus praecox) and regulation of flowering

文献类型： 外文期刊

作者： Wu, Huafeng 1 ; Liu, Bin 1 ; Cao, Yinzhu 1 ; Ma, Guanpeng 1 ; Zheng, Xiaowen 1 ; Zhu, Haoxiang 3 ; Song, Xingrong 4 ; Sui, Shunzhao 1 ;

作者机构： 1.Southwest Univ, Coll Hort & Landscape Architecture, Chongqing Engn Res Ctr Floriculture, Minist Educ,Key Lab Agr Biosafety & Green Prod Upp, Chongqing 400715, Peoples R China

2.Guizhou Acad Agr Sci, Inst Hort, Guiyang 550006, Guizhou, Peoples R China

3.Southwest Univ, Coll Hort & Landscape Architecture, Chongqing 400715, Peoples R China

4.Sichuan Acad Agr Sci, Garden & Flower Res Ctr, Hort Res Inst, Chengdu, Peoples R China

关键词： Wintersweet; PEBP family; CpTFL1; Alternative Splicing; Flowering

期刊名称：INDUSTRIAL CROPS AND PRODUCTS （ 影响因子：6.2； 五年影响因子：6.2 ）

ISSN： 0926-6690

年卷期： 2025 年 234 卷

页码：

收录情况： SCI

摘要： Wintersweet (Chimonanthus praecox) is a traditional flower in China, popular as a woody cut flower during winter, when few other flowers bloom. Phosphatidylethanolamine-binding proteins (PEBPs) are crucial for plant growth and development, particularly in the regulation of flowering. Although PEBPs have been extensively studied in various plant species, research on these genes in wintersweet remains limited. This study identified PEBP gene family in wintersweet, investigated their phylogenetic relationships, gene structure, conserved motifs, and chromosomal locations and explored the roles of the TFL1-like subfamily members CpTFL1a and CpTFL1b in flowering regulation. Seven members of the PEBP gene family were identified in wintersweet. Phylogenetic analysis was employed to classify these genes into three subfamilies, supported by conserved motif, domain, and gene structure analyses. Cis-element analysis revealed that the promoters of CpPEBPs contain numerous elements responsive to various hormones and stress signals, indicating that flowering regulation in wintersweet by CpPEBPs may require multiple hormonal and environmental signal induction. Furthermore, the CpTFL1b gene has two transcriptional isoforms. CpTFL1a and the two CpTFL1bs isoforms are localized in the cytoplasm and nucleus. Overexpression of CpTFL1s in Nicotiana benthamiana delays flowering and inhibits root development. CpTFL1a and CpFT1 physically interact with CpFD and Cp14-3-3; CpFT2 and CpTFL1b-2 physically interact with CpFD but not with Cp14-3-3; CpTFL1b-1 requires Cp14-3-3 as an intermediary protein for interaction with CpFD. Based on the expression patterns of CpTFL1s and CpFTs at various stages of flower development, it is suggested that CpTFL1bs and CpFT2 competitively interact with CpFD in different ways during the floral transition phase, thereby regulating the switch from vegetative to reproductive growth. Conversely, CpTFL1a and CpFT1 competed with CpFD similarly during floral bud dormancy release, promoting flowering. This study lays foundation for understanding the complex regulatory network of flowering in wintersweet and provides insights into the molecular breeding of wintersweet.

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