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<p>MYB transcription factors play an important role in the response of plants to abiotic stress<b>.</b> The flavonoids found in <i>Erigeron breviscapus</i> have significant anti-inflammatory and cardiovascular therapeutic effects. It has been discovered that <i>EbMYBP1</i>, a gene cloned from <i>E.breviscapus</i>, positively regulates flavonoid synthesis. However, it is uncertain whether <i>EbMYBP1</i>-OE directly responds to ultraviolet B (UV-B) by increasing flavonoids accumulation. Here, an integrated metabolome-transcriptome analysis revealed an important role for <i>EbMYBP1</i> in transgenic tobacco seeds in response to UV-B. The role of <i>EbMYBP1</i> under UV-B has been examined. The results showed that a higher level of UV-B tolerance was observed in seedlings and leaves of <i>EbMYBP1</i>-OE lines (OE8, OE10, OE15) than in wild-type line (WT), identifying several flavonoid biosynthesis genes and metabolites. Compared with WT, a significant decrease in reactive oxygen species (ROS), an increase in antioxidant enzyme expression, and significant induction of genes involved in flavonoids synthesis, UV-B response, and ROS was observed after UV-B treatment in <i>EbMYBP1</i>-OE lines. Overall, <i>EbMYBP1</i> modulates ROS scavengers and upregulates stress response genes to increase UV-B tolerance.</p>

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Molecular underpinnings of EbMYBP1-mediated plant defense against UV-B radiation

  • 期刊论文

  • 发表日期：

    2025年4月1日

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  • Chunfan Xiang,
  • Juan Wang,
  • Pinhan Zhou,
  • Mamtimin Mamat,
  • Eparay Abdisattar,
  • Lesong Li,
  • Yan Zhao

摘要

MYB transcription factors play an important role in the response of plants to abiotic stress. The flavonoids found in Erigeron breviscapus have significant anti-inflammatory and cardiovascular therapeutic effects. It has been discovered that EbMYBP1, a gene cloned from E.breviscapus, positively regulates flavonoid synthesis. However, it is uncertain whether EbMYBP1-OE directly responds to ultraviolet B (UV-B) by increasing flavonoids accumulation. Here, an integrated metabolome-transcriptome analysis revealed an important role for EbMYBP1 in transgenic tobacco seeds in response to UV-B. The role of EbMYBP1 under UV-B has been examined. The results showed that a higher level of UV-B tolerance was observed in seedlings and leaves of EbMYBP1-OE lines (OE8, OE10, OE15) than in wild-type line (WT), identifying several flavonoid biosynthesis genes and metabolites. Compared with WT, a significant decrease in reactive oxygen species (ROS), an increase in antioxidant enzyme expression, and significant induction of genes involved in flavonoids synthesis, UV-B response, and ROS was observed after UV-B treatment in EbMYBP1-OE lines. Overall, EbMYBP1 modulates ROS scavengers and upregulates stress response genes to increase UV-B tolerance.