VvMYBC2-L1 cooperates with histone deacetylase VvHDA15 to repress anthocyanin biosynthesis in grape under high temperature

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ID: 333720
2026
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Abstract
Abstract High temperature restricts anthocyanin accumulation in grape berries, but how transcriptional repressors coordinate with chromatin regulation remains unclear. We identified the MYB repressor VvMYBC2-L1 as a heat-responsive regulator through transcriptome analysis and functional assays. VvMYBC2-L1 overexpression reduced berry and callus pigmentation, anthocyanin accumulation, and expression of phenylpropanoid and anthocyanin biosynthetic genes. VvMYBC2-L1 associated with selected VvPAL and VvUFGT promoter regions, interacted with the basic helix-loop-helix protein VvMYC1, weakened the VvMYBA1–VvMYC1 interaction, and reduced their activation of both promoters. VvMYBC2-L1 also directly interacted with VvHDA15, a nuclear class II histone deacetylase with enzymatic activity in vitro. VvHDA15 overexpression repressed anthocyanin accumulation and reduced histone H3 lysine 9 acetylation at selected VvPAL and VvUFGT promoter regions. Conversely, VvHDA15 silencing partially restored berry coloration and anthocyanin accumulation under high temperature. Co-expression of VvMYBC2-L1 and VvHDA15 strengthened repression of anthocyanin accumulation and target-gene expression and further reduced histone acetylation at selected promoter regions relative to VvHDA15 overexpression alone. These findings identify functional cooperation between a heat-responsive MYB repressor and histone deacetylation that limits anthocyanin biosynthesis in grape berries.
Reference Key
openalex_W7223299532 Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Ziyan Guo, Mengyu Xu, Wen Tang, Suwen Lu
Journal Plant physiology and biochemistry : PPB
Year 2026
DOI
10.1093/plphys/kiag786
URL
https://doi.org/10.1093/plphys/kiag786
Keywords Keywords not found

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