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Key message <p><i>OsWRKY70</i> modulates ROS levels in rice to enhance tolerance to cold and salt stress. <i>OsWRKY70</i><sup><i>HapI</i></sup> reduces ROS and improves cold and salt tolerance, while <i>OsWRKY70</i><sup><i>HapII</i></sup> regulates ROS to increase salt tolerance and cold sensitivity, making <i>OsWRKY70</i> a key target for improving rice stress resilience.</p> Abstract <p>Reactive oxygen species are essential in plant responses to abiotic stresses like drought, salinity, and extreme temperatures. In rice, the transcription factor <i>OsWRKY70</i> plays a pivotal role in regulating ROS levels to enhance stress tolerance. This study examines two haplotypes of <i>OsWRKY70</i>, <i>OsWRKY70</i><sup><i>HapI</i></sup> and <i>OsWRKY70</i><sup><i>HapII</i></sup>, and their effects on rice resilience to cold and salt stress. Overexpression of <i>OsWRKY70</i><sup><i>HapI</i></sup> resulted in lower ROS accumulation, significantly improving cold tolerance by upregulating the antioxidant gene <i>OsMYB4</i> and maintaining ion balance through <i>OsMYB21</i> and <i>OsAMTR1</i>. In contrast, <i>OsABA8ox1</i> led to higher ROS levels in <i>OsWRKY70</i><sup><i>HapII</i></sup> and increased sensitivity to cold stress, while still enhancing salt tolerance similar to <i>OsWRKY70</i><sup><i>HapI</i></sup> by regulating <i>OsMYB21</i> and <i>OsAMTR1</i>. Haplotype analysis identified specific SNPs in <i>OsWRKY70</i> that are critical for its transcriptional activity and stress response functions. Subcellular localization confirmed that OsWRKY70 operates as a nuclear transcription factor. These findings highlight the potential of <i>OsWRKY70</i> haplotypes in genetic strategies to improve rice resilience to adverse environmental conditions by precisely modulating ROS and stress-responsive genes.</p>

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Genetic variants of OsWRKY70 modulate ROS levels to improve rice stress adaptation

  • 期刊论文

  • 发表日期：

    2025年7月12日

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  • Xiaoping Ding,
  • GongYe Cheng,
  • Di Zhang,
  • Zhijun Wang,
  • Mingchan Liu,
  • Wenyu Li,
  • Lingling Li,
  • Ling Liu,
  • Cheng Zheng,
  • HouXiong Wu,
  • Dingyang Yuan,
  • Meijuan Duan,
  • Citao Liu

摘要

Key message

OsWRKY70 modulates ROS levels in rice to enhance tolerance to cold and salt stress. OsWRKY70HapI reduces ROS and improves cold and salt tolerance, while OsWRKY70HapII regulates ROS to increase salt tolerance and cold sensitivity, making OsWRKY70 a key target for improving rice stress resilience.

Abstract

Reactive oxygen species are essential in plant responses to abiotic stresses like drought, salinity, and extreme temperatures. In rice, the transcription factor OsWRKY70 plays a pivotal role in regulating ROS levels to enhance stress tolerance. This study examines two haplotypes of OsWRKY70, OsWRKY70HapI and OsWRKY70HapII, and their effects on rice resilience to cold and salt stress. Overexpression of OsWRKY70HapI resulted in lower ROS accumulation, significantly improving cold tolerance by upregulating the antioxidant gene OsMYB4 and maintaining ion balance through OsMYB21 and OsAMTR1. In contrast, OsABA8ox1 led to higher ROS levels in OsWRKY70HapII and increased sensitivity to cold stress, while still enhancing salt tolerance similar to OsWRKY70HapI by regulating OsMYB21 and OsAMTR1. Haplotype analysis identified specific SNPs in OsWRKY70 that are critical for its transcriptional activity and stress response functions. Subcellular localization confirmed that OsWRKY70 operates as a nuclear transcription factor. These findings highlight the potential of OsWRKY70 haplotypes in genetic strategies to improve rice resilience to adverse environmental conditions by precisely modulating ROS and stress-responsive genes.