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<p>PYL receptor proteins are essential for enhancing plant resilience to extreme environments; however, their functions in woody plants—particularly in response to osmotic stress—remain poorly understood. In this study, we identified and comprehensively characterized 14 <i>PYL</i> genes in <i>Populus trichocarpa</i>. <i>PtrPYL11</i>, a core member, showed up-regulation following both ABA and dehydration treatments, suggesting that it may act as a positive regulator of osmotic stress responses by mediating the expression of ABA-related genes. Specifically, <i>PtrPYL11</i>-overexpressing poplar lines exhibited stronger osmotic stress tolerance than the wild type. Transcriptome analysis revealed that <i>PtrPYL11</i> may indirectly regulate the expression of core transcription factors such as <i>DOF1</i> and <i>TCP9</i>, mediating the ABA-signaling pathway in poplar. This study systematically characterizes the molecular features of the <i>PtrPYL</i> gene family and clarifies the role of <i>PtrPYL11</i> in poplar osmotic stress responses. These findings not only lay a foundation for further exploration of its biological functions but also provide valuable genetic resources for breeding drought-tolerant forest tree varieties through genetic engineering.</p>

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Overexpression of PtrPYL11 enhance drought tolerance in Populus: evidence from genome-wide identification and comparative transcriptome profiling

  • 期刊论文

  • 发表日期：

    2026年4月2日

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  • Shuang-Lian Deng,
  • Shu-Ying Wei,
  • Rui-Quan Wang,
  • Yuan Zhang,
  • Hao Li,
  • Xing-Yu Liu,
  • Xin-Ran Yu,
  • Guan-Ru Ren,
  • Ting Wang,
  • Fang He

摘要

PYL receptor proteins are essential for enhancing plant resilience to extreme environments; however, their functions in woody plants—particularly in response to osmotic stress—remain poorly understood. In this study, we identified and comprehensively characterized 14 PYL genes in Populus trichocarpa. PtrPYL11, a core member, showed up-regulation following both ABA and dehydration treatments, suggesting that it may act as a positive regulator of osmotic stress responses by mediating the expression of ABA-related genes. Specifically, PtrPYL11-overexpressing poplar lines exhibited stronger osmotic stress tolerance than the wild type. Transcriptome analysis revealed that PtrPYL11 may indirectly regulate the expression of core transcription factors such as DOF1 and TCP9, mediating the ABA-signaling pathway in poplar. This study systematically characterizes the molecular features of the PtrPYL gene family and clarifies the role of PtrPYL11 in poplar osmotic stress responses. These findings not only lay a foundation for further exploration of its biological functions but also provide valuable genetic resources for breeding drought-tolerant forest tree varieties through genetic engineering.