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<p>The MYB transcription factor family is pivotal for plant abiotic stress responses, yet its role in selenium-alleviated salt stress in red beet remains unclear. We conducted genome-wide identification of BvMYB genes combined with integrated transcriptomic and metabolomic analyses to address this gap. A total of 70 BvMYB genes were identified, showing close phylogenetic homology to conserved motif organization, with involvement in phenylpropanoid metabolism and alkaloid biosynthesis. Notably, <i>BvMYB17</i> was specifically induced by selenium, representing the first reported specific association with terpenoid metabolites in red beet and functioning as a positive regulator in selenium-mediated salt tolerance. <i>BvMYB38</i> was suppressed by gibberellin and methyl jasmonate (acting as a negative regulator), and served as a key regulator under salt-selenium interaction; it also acted as a broad-spectrum factor positively correlated with alkaloids, flavonoids, phenolic acids, and terpenoids. The non-linear relationship between these two genes’ expression and selenium speciation content indicated a complex hierarchical regulatory network. Our findings identify <i>BvMYB38</i> and <i>BvMYB17</i> as core candidates governing selenium-enhanced salt stress tolerance in red beet, defining a targeted metabolic branch for stress alleviation and laying a solid foundation for subsequent functional validation and crop improvement.</p>

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Genome-Wide Identification of MYB Gene Family and Specific Regulatory Roles of BvMYB38/BvMYB17 in Selenium-Mediated Salt Stress Alleviation in Red Beet

  • 期刊论文

  • 发表日期：

    2026年5月4日

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  • Mengpu Jin,
  • Mengmeng Wang,
  • Naixin Liu,
  • Qin Zhou,
  • Hanbing Zhang,
  • Chuanwen Jiang,
  • Shuo Chen,
  • Zhuo Wang

摘要

The MYB transcription factor family is pivotal for plant abiotic stress responses, yet its role in selenium-alleviated salt stress in red beet remains unclear. We conducted genome-wide identification of BvMYB genes combined with integrated transcriptomic and metabolomic analyses to address this gap. A total of 70 BvMYB genes were identified, showing close phylogenetic homology to conserved motif organization, with involvement in phenylpropanoid metabolism and alkaloid biosynthesis. Notably, BvMYB17 was specifically induced by selenium, representing the first reported specific association with terpenoid metabolites in red beet and functioning as a positive regulator in selenium-mediated salt tolerance. BvMYB38 was suppressed by gibberellin and methyl jasmonate (acting as a negative regulator), and served as a key regulator under salt-selenium interaction; it also acted as a broad-spectrum factor positively correlated with alkaloids, flavonoids, phenolic acids, and terpenoids. The non-linear relationship between these two genes’ expression and selenium speciation content indicated a complex hierarchical regulatory network. Our findings identify BvMYB38 and BvMYB17 as core candidates governing selenium-enhanced salt stress tolerance in red beet, defining a targeted metabolic branch for stress alleviation and laying a solid foundation for subsequent functional validation and crop improvement.