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Key message <p><i>CaWRKY6</i> functions together with <i>CaERF3</i> to regulate ROS production, thus positively modulating pepper salt stress response.</p> Abstract <p>Salt stress significantly inhibits the growth and productivity of plants. Pepper (<i>Capsicum annuum</i> L.), a widely cultivated economic horticultural crop, exhibits high sensitivity to salinity. This study investigates the role of the transcription factor <i>CaWRKY6</i> in modulating pepper’s responses to salt stress. Our findings indicate that <i>CaWRKY6</i> predominantly localizes at the cell nucleus, and its expression is significantly induced upon salt treatment. The <i>CaWRKY6</i>-silenced pepper plants exhibit heightened sensitivity to salt stress, as evidenced by increased malondialdehyde (MDA) levels and decreased proline content. Additionally, <i>CaWRKY6-</i>silenced pepper plants show elevated levels of reactive oxygen species (ROS). Through a yeast two-hybrid screen, <i>CaERF3</i> is identified as an interactor of <i>CaWRKY6</i>. Silencing <i>CaERF3</i> expression induces a similar sensitive salt response and elevated ROS levels as observed in <i>CaWRKY6</i>-silenced plants. Collectively, our results demonstrate that the <i>CaWRKY6-CaERF3</i> module positively regulates salt stress responses in pepper by modulating ROS homeostasis.</p>

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CaWRKY6-CaERF3 regulate ROS homeostasis to positively modulate salt stress in pepper (Capsicum annuum L.)

  • 期刊论文

  • 发表日期：

    2026年1月28日

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  • Zhimin Li,
  • Huibin Han,
  • Hui Li,
  • Zhen An,
  • Yue Wang,
  • Yufang Wen,
  • Liping Qiu,
  • Chao Ji,
  • Qinghong Zhou,
  • Jianping Liu

摘要

Key message

CaWRKY6 functions together with CaERF3 to regulate ROS production, thus positively modulating pepper salt stress response.

Abstract

Salt stress significantly inhibits the growth and productivity of plants. Pepper (Capsicum annuum L.), a widely cultivated economic horticultural crop, exhibits high sensitivity to salinity. This study investigates the role of the transcription factor CaWRKY6 in modulating pepper’s responses to salt stress. Our findings indicate that CaWRKY6 predominantly localizes at the cell nucleus, and its expression is significantly induced upon salt treatment. The CaWRKY6-silenced pepper plants exhibit heightened sensitivity to salt stress, as evidenced by increased malondialdehyde (MDA) levels and decreased proline content. Additionally, CaWRKY6-silenced pepper plants show elevated levels of reactive oxygen species (ROS). Through a yeast two-hybrid screen, CaERF3 is identified as an interactor of CaWRKY6. Silencing CaERF3 expression induces a similar sensitive salt response and elevated ROS levels as observed in CaWRKY6-silenced plants. Collectively, our results demonstrate that the CaWRKY6-CaERF3 module positively regulates salt stress responses in pepper by modulating ROS homeostasis.