Genome-Wide Characterization, Comparative Analysis, and Expression Profiling of SWEET Genes Family in Four Cymbidium Species (Orchidaceae)

文献类型： 外文期刊

第一作者： Wei, Yonglu

作者： Wei, Yonglu;Li, Jie;Jin, Jianpeng;Gao, Jie;Xie, Qi;Lu, Chuqiao;Zhu, Genfa;Yang, Fengxi;Jin, Jianpeng

作者机构：

关键词： orchid; SWEET; flower development; transcriptional regulatory

期刊名称：INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES （ 影响因子：4.9； 五年影响因子：5.7 ）

ISSN： 1661-6596

年卷期： 2025 年 26 卷 9 期

页码：

收录情况： SCI

摘要： The SWEET (Sugar Will Eventually be Exported Transporters) protein family plays a key role in plant growth, adaptation, and stress responses by facilitating soluble sugar transport. However, their functions in Cymbidium remain poorly understood. This study identified 59 SWEET genes across four Cymbidium species, encoding conserved MtN3/saliva domains. Despite variations in exon-intron structures, gene motifs and domains were highly conserved. Phylogenetic analysis grouped 95 SWEET proteins from six species into four clades, with gene expansion driven by whole-genome, segmental, and tandem duplications. Cis-element analysis and expression profiling across 72 samples revealed diverse regulatory patterns. Notably, SWEET genes showed peak expression in floral development, leaf morph variations, and diurnal rhythms. qRT-PCR and transcription factor binding analysis further highlighted their regulatory roles in floral patterning, leaf variation, and metabolic rhythms. These findings provide a foundation for future studies on SWEET gene function and their potential molecular breeding value in orchids.

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