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<p>Soil salinization threatens sustainable agriculture by reducing crop growth and yield. Stress priming, in which seedlings experience mild salt treatment followed by recovery before re-exposure, can enhance tolerance, but its molecular basis in legumes is unclear. Here, we used mung bean (<i>Vigna radiata</i>) to compare primed and non-primed plants under subsequent salt stress. Primed plants rapidly accumulated proline, activated antioxidant enzymes, and maintained lower Na⁺/K⁺ ratios at early stages. During intermediate stress, defense- and hormone-related transcripts remained elevated, sustaining physiological advantages. At later stages, primed plants preserved chlorophyll, reduced malondialdehyde accumulation, and limited electrolyte leakage, coinciding with persistently accessible stress-responsive promoters enriched for bZIP class A-like motifs. Genome-wide DNA methylation diverged, with primed plants retaining higher CpG, CHG, and CHH methylation and upregulating heterochromatin maintenance factors. These results reveal a temporal, multi-layer regulatory framework linking transcription, chromatin accessibility, and DNA methylation that underpins salt priming in mung bean.</p>

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Salt priming coordinates transcriptional and epigenetic states for enhanced salt tolerance in mung bean (Vigna radiata)

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年7月1日

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  • Zhi-Wei Wang,
  • Min Liu,
  • Hui-Tong Sang,
  • Song Hou,
  • Guan Li,
  • Ru-Mei Tian,
  • Yong-Yi Yang,
  • Kun Xie,
  • Longxin Wang,
  • Na-Na Li,
  • Kai-Hua Jia

摘要

Soil salinization threatens sustainable agriculture by reducing crop growth and yield. Stress priming, in which seedlings experience mild salt treatment followed by recovery before re-exposure, can enhance tolerance, but its molecular basis in legumes is unclear. Here, we used mung bean (Vigna radiata) to compare primed and non-primed plants under subsequent salt stress. Primed plants rapidly accumulated proline, activated antioxidant enzymes, and maintained lower Na⁺/K⁺ ratios at early stages. During intermediate stress, defense- and hormone-related transcripts remained elevated, sustaining physiological advantages. At later stages, primed plants preserved chlorophyll, reduced malondialdehyde accumulation, and limited electrolyte leakage, coinciding with persistently accessible stress-responsive promoters enriched for bZIP class A-like motifs. Genome-wide DNA methylation diverged, with primed plants retaining higher CpG, CHG, and CHH methylation and upregulating heterochromatin maintenance factors. These results reveal a temporal, multi-layer regulatory framework linking transcription, chromatin accessibility, and DNA methylation that underpins salt priming in mung bean.