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Acta Horticulturae Sinica ›› 2025, Vol. 52 ›› Issue (10): 2567-2581.doi: 10.16420/j.issn.0513-353x.2024-0761

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

Transcription Factors VlWRKY14 and VlTCP5 Respond to Exogenous CPPU and Regulate the Expression of VlIPT12 in Grape

ZHAO Yaru1,2, WANG Leilei1,2, KONG Guanzhuo1,2, LI Hong1,2, ZHENG Jintao1,2, YUE Yihan1,2, SHI Qiaofang1,2, ZHAO Xiaochun1, YU Yihe1,2,*()   

  1. 1 College of Horticulture and Plant Protection,Henan University of Science and Technology,Luoyang,Henan 471023,China
    2 Henan Provincial Engineering Research Center on Characteristic Berry Germplasm Innovation & Utilization,Luoyang,Henan 471023,China
  • Received:2025-05-27 Revised:2025-06-27 Online:2025-10-25 Published:2025-10-28
  • Contact: YU Yihe

Abstract:

Treatment with the cytokinin CPPU[forchlorfenuron,N-(2-chloro-4-pyridinyl)-N- phenylurea]significantly improves the fruit setting rate in grapevines,but the underlying molecular mechanisms remain unclear. To elucidate the expression of the isopentenyl transferase gene VlIPT12 after CPPU treatment and the molecular mechanism of its regulation by specific transcription factors,in this study,the VlIPT12 was cloned from‘Kyoho’grapes,and bioinformatics analysis,expression characteristics,and transcriptional regulation analysis were performed. The results showed that the full length of the VlIPT12 was 984 bp,containing a conserved ATP/ADP binding site(P-loop motif)specific to the IPT family and localizing in the nucleus. The expression level of the VlIPT12 gene was the highest in young fruits,followed by that in flowers and tendrils,and was the lowest in leaves. After the grape inflorescences were treated with CPPU,the expression level of VlIPT12 gene was significantly lower than that of the control. The VlIPT12 promoter responded to the treatments of salicylic acid and methyl jasmonate. VlWRKY14 and VlTCP5,as the key transcription factors of VlIPT12,had the same expression pattern as VlIPT12 after CPPU treatment and could bind to the key sites(P1,P2,P4)of the VlIPT12 promoter to promote its expression. In conclusion,after the grape inflorescences were treated with CPPU,the expression level of VlIPT12 decreased,and the transcription factors VlWRKY14 and VlTCP5 could bind to the key sites of the VlIPT12 promoter to positively regulate the expression of VlIPT12 in young fruits.

Key words: grape, berry set, cytokinin, VlIPT12, transcriptional regulation