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Acta Horticulturae Sinica ›› 2026, Vol. 53 ›› Issue (7): 2019-2033.doi: 10.16420/j.issn.0513-353x.2025-0792

• Genetic & Breeding · Germplasm Resources · Molecular Biology • Previous Articles     Next Articles

Genome-Wide Identification of Grapevine SWEET Protein Family Reveals the Potential Function of VvSWEET15 in Sugar Accumulation

YAN Yun1, XIAO Yang1, YAO Yaqi1, NONG Yuying1, GUO Dejun2, SHAO Jianhui3, MA Chunhua1, SU Jing1,**()   

  1. 1 College of Landscape Architecture and HorticultureYunnan Agricultural University, Kunming 650201, China
    2 Gansu Nongken Yongchang Farm Co.Ltd.,Yongchang, Gansu 737200, China
    3 College of Plant ProtectionYunnan Agricultural University, Kunming 650201, China
  • Received:2025-08-26 Revised:2026-04-19 Online:2026-07-25 Published:2026-07-23
  • Contact: SU Jing

Abstract:

SWEET is a newly discovered class of sugar transporters that regulate the unloading and accumulation of sugar in plants and participate in plant senescence,nectar secretion,hormone signaling,pathogenesis,and abiotic stress response. The study systematically identifies the VvSWEETs protein family in grapevine(Vitis vinifera L.)and analyses its expression patterns across different stages of berry development to explore genes related to sugar accumulation in grape berries,which is crucial for improving fruit quality. The physicochemical properties,phylogenetic relationships,gene structure,and cis-regulatory elements of VvSWEETs were analyzed using grape whole-genome data. Integrating these analyses with transcriptome data from‘Red Globe’at different developmental stages,VvSWEET15 was identified as a key candidate. Its function in fruit sugar accumulation was elucidated through gene cloning,subcellular localization,and gene silencing. The grape genome contains 16 VvSWEET genes,distributed on 10 chromosomes and categorized into four evolutionary clades(CladesⅠ,Ⅱ,Ⅲ and Ⅳ). Genes within each clade share similar structural characteristics. The promoter region is enriched in cis-acting elements responsive to light, phytohormones, development, and stress. Transcriptome analysis revealed increased VvSWEET15 expression from 40 to 120 days after flowering,positively correlating with hexose accumulation in ripe berries. VvSWEET15 is a protein localized to the plasma membrane,and transient silencing of its expression significantly reduced the fructose and glucose concentrations in fruits,indicating that VvSWEET15 plays an important role in the accumulation of sugar concentration in grape fruits.

Key words: Vitis vinifera, sugar transporter, VvSWEET, phylogenetic analysis, sugar accumulation