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<p>Sodium silicate (Si) treatment can induce resistance in harvested muskmelon fruits (<i>Cucumis melo</i> cv. Yujinxiang) inoculated with <i>Trichothecium roseum</i>, and reduce lesion diameter and incidence of disease spots in the fruit. Moreover, Si treatment increased the production of reactive oxygen species (ROS) and enhanced the activity of phenylalanine ammonia-lyase (PAL) and peroxidase (POD) in the <i>T. roseum</i>-infected fruit. The results of whole-genome bisulfite sequencing indicated that Si treatment increased DNA methylation in muskmelon fruits, with CG sites exhibiting higher methylation levels and the largest number of differentially methylated regions (DMRs). In addition, several DMR-associated genes (DMGs) related to defense responses and the genes involved in ROS metabolism and mitochondrial function were identified, and the changes attributed to hypermethylation in the promoter regions. Therefore, we hypothesized that the changes of genes expression were mainly related to DNA methylation, particularly those involved in the biosynthesis of secondary metabolites and phenylpropanoid biosynthesis.</p>

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Sodium silicate enhance induced resistance by regulating DNA methylation in postharvest muskmelon

  • 期刊论文

  • 发表日期：

    2025年4月10日

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  • Liang Lyu,
  • Chenglong Zhao,
  • Lei Li,
  • Yuchao Ning,
  • Yawen Luo,
  • Xining He,
  • Di Gong

摘要

Sodium silicate (Si) treatment can induce resistance in harvested muskmelon fruits (Cucumis melo cv. Yujinxiang) inoculated with Trichothecium roseum, and reduce lesion diameter and incidence of disease spots in the fruit. Moreover, Si treatment increased the production of reactive oxygen species (ROS) and enhanced the activity of phenylalanine ammonia-lyase (PAL) and peroxidase (POD) in the T. roseum-infected fruit. The results of whole-genome bisulfite sequencing indicated that Si treatment increased DNA methylation in muskmelon fruits, with CG sites exhibiting higher methylation levels and the largest number of differentially methylated regions (DMRs). In addition, several DMR-associated genes (DMGs) related to defense responses and the genes involved in ROS metabolism and mitochondrial function were identified, and the changes attributed to hypermethylation in the promoter regions. Therefore, we hypothesized that the changes of genes expression were mainly related to DNA methylation, particularly those involved in the biosynthesis of secondary metabolites and phenylpropanoid biosynthesis.