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<p>Water deficit disrupts plant membrane structure and function, leading to the production and accumulation of reactive oxygen species (ROS) and water loss. Plants eliminate ROS through antioxidant defense systems such as superoxide dismutase, peroxidase, and catalase. Abscisic acid (ABA), a crucial hormone in plant responses to drought, regulates nitric oxide (NO) synthesis to facilitate stomatal closure, thereby reducing water loss. Phospholipase C (PLC) has important functions in plant growth and development under adverse conditions. The model system <i>Arabidopsis thaliana</i> contains nine PLC genes. The expression of <i>AtPLC3</i>, <i>AtPLC5</i>, and <i>AtPLC7</i> is crucial for the ABA signaling pathway, and their overexpression enhances the drought tolerance of <i>A. thaliana</i>. Here, we conducted a functional analysis on the <i>AtPLC1</i> gene. We found that <i>AtPLC1</i> positively regulated drought tolerance by enhancing the activity of antioxidant enzymes to mitigate ROS accumulation. Simultaneously, <i>AtPLC1</i> modulated NO production in guard cells by upregulating the expression of the nitrate reductase genes <i>NIA1</i> and <i>NIA2</i>, thereby participating in ABA–induced stomatal movement. These findings suggest that <i>AtPLC1</i> plays an important role in ABA signal transduction and plant growth and development under water-deficient conditions.</p>

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PLC1 Regulates Stomatal Closure and Enhances Arabidopsis Tolerance to Water Deficit by Modulating the ABA–H2O2–NO Pathway

  • 期刊论文

  • 发表日期：

    2025年9月14日

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  • Wei Wang,
  • Liping Luo,
  • Jiaying Kou,
  • Yue Wang,
  • Lulu Zhang,
  • Ning Yang

摘要

Water deficit disrupts plant membrane structure and function, leading to the production and accumulation of reactive oxygen species (ROS) and water loss. Plants eliminate ROS through antioxidant defense systems such as superoxide dismutase, peroxidase, and catalase. Abscisic acid (ABA), a crucial hormone in plant responses to drought, regulates nitric oxide (NO) synthesis to facilitate stomatal closure, thereby reducing water loss. Phospholipase C (PLC) has important functions in plant growth and development under adverse conditions. The model system Arabidopsis thaliana contains nine PLC genes. The expression of AtPLC3, AtPLC5, and AtPLC7 is crucial for the ABA signaling pathway, and their overexpression enhances the drought tolerance of A. thaliana. Here, we conducted a functional analysis on the AtPLC1 gene. We found that AtPLC1 positively regulated drought tolerance by enhancing the activity of antioxidant enzymes to mitigate ROS accumulation. Simultaneously, AtPLC1 modulated NO production in guard cells by upregulating the expression of the nitrate reductase genes NIA1 and NIA2, thereby participating in ABA–induced stomatal movement. These findings suggest that AtPLC1 plays an important role in ABA signal transduction and plant growth and development under water-deficient conditions.