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<p>MADS-box proteins have been reported to regulate developmental plasticity and stress adaptation in plants. <i>PISTILLATA</i> (<i>PI</i>) is one of the MADS-box member, however, its function in regulating the abiotic stress responses in plants, especially in trees, remain unexplored. Here, we identified and characterized <i>PdPI</i>, a <i>PI</i> ortholog from <i>Populus davidiana</i>, whose expression is induced by drought stress. Overexpression of <i>PdPI</i> in <i>P. davidiana</i> enhanced drought tolerance by regulating stomatal aperture. Under drought stress, the <i>PdPI</i> overexpression plants accumulated higher contents of osmolytes, including proline and soluble sugars, and displayed increased activities of key antioxidant enzymes, including superoxide dismutase (SOD), peroxidase (POD), and catalase (CAT), along with reduced malondialdehyde (MDA) content. Additionally, we found that <i>PdPI</i> binds to the CArG-box motif in vivo and activates the transcription of <i>PdSOD</i> and <i>PdPODs</i>. Collectively, these findings reveal that <i>PdPI</i> functions as a positive regulator in response to drought stress in <i>P. davidiana.</i></p>

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PdPI, a PISTILLATA ortholog from Populus davidiana, enhances drought tolerance by regulating stomatal aperture and antioxidant defense

  • 期刊论文

  • 发表日期：

    2026年7月17日

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  • Siyuan Li,
  • Meiqi Lu,
  • Ling Jin,
  • Zhanchen Ren,
  • Xinyu Wang,
  • Song Chen,
  • Yunxia Wei,
  • Jiaxin Liu,
  • Yuanfu Liu,
  • Haoran Bao,
  • Yue Zhang,
  • Tingyu Cao,
  • Ru Yi,
  • Yutong Ding,
  • Jiajia Shen,
  • Qiushuang Zhao,
  • Su Chen

摘要

MADS-box proteins have been reported to regulate developmental plasticity and stress adaptation in plants. PISTILLATA (PI) is one of the MADS-box member, however, its function in regulating the abiotic stress responses in plants, especially in trees, remain unexplored. Here, we identified and characterized PdPI, a PI ortholog from Populus davidiana, whose expression is induced by drought stress. Overexpression of PdPI in P. davidiana enhanced drought tolerance by regulating stomatal aperture. Under drought stress, the PdPI overexpression plants accumulated higher contents of osmolytes, including proline and soluble sugars, and displayed increased activities of key antioxidant enzymes, including superoxide dismutase (SOD), peroxidase (POD), and catalase (CAT), along with reduced malondialdehyde (MDA) content. Additionally, we found that PdPI binds to the CArG-box motif in vivo and activates the transcription of PdSOD and PdPODs. Collectively, these findings reveal that PdPI functions as a positive regulator in response to drought stress in P. davidiana.