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<p>Rapid movements of plant structures triggered by mechanical force have been documented for centuries; however, how plant cells sense mechanical stimuli and generate rapid response remains unknown. Here we show the central role of a mechanosensitive channel gene in touch-triggered rapid stigma movement of <i>Torenia fournieri</i>. <i>T. fournieri</i> possesses a bilobed stigma sensitive to mechanical stimuli. Using live-cell calcium imaging, we detect that touch induces a wave of cytosolic calcium ([Ca<sup>2+</sup>]<sub>cyt</sub>) essential for stigma movement. Transcriptomic analysis reveals distinct gene expression profiles between the stigma and style, leading to the identification of the <i>MscS-like</i> gene <i>JUE1</i>, predominantly expressed in stigmas. Stigmas of <i>jue1</i> mutants exhibit complete loss of touch-triggered movement, confirming its role as a key regulator in sensitive stigma movement. JUE1 is required for rapid propagation of the touch-induced [Ca<sup>2+</sup>]<sub>cyt</sub>, as cell-to-cell spreading of the [Ca<sup>2+</sup>]<sub>cyt</sub> wave is impaired in the <i>jue1</i>. To conclude, we report a plant mechanosensitive ion channel involved in touch-triggered organ movement by modulating calcium dynamics.</p>

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A mechanosensitive ion channel controls touch-triggered stigma movement through manipulation of calcium signature in Torenia

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年7月8日

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  • Xuan Zhou,
  • Binghou Li,
  • Jiahuizi Li,
  • Yufei Sun,
  • Ruohan Xie,
  • Tetsuya Higashiyama,
  • Shi Xiao,
  • Guorong Xin,
  • Shihao Su

摘要

Rapid movements of plant structures triggered by mechanical force have been documented for centuries; however, how plant cells sense mechanical stimuli and generate rapid response remains unknown. Here we show the central role of a mechanosensitive channel gene in touch-triggered rapid stigma movement of Torenia fournieri. T. fournieri possesses a bilobed stigma sensitive to mechanical stimuli. Using live-cell calcium imaging, we detect that touch induces a wave of cytosolic calcium ([Ca2+]cyt) essential for stigma movement. Transcriptomic analysis reveals distinct gene expression profiles between the stigma and style, leading to the identification of the MscS-like gene JUE1, predominantly expressed in stigmas. Stigmas of jue1 mutants exhibit complete loss of touch-triggered movement, confirming its role as a key regulator in sensitive stigma movement. JUE1 is required for rapid propagation of the touch-induced [Ca2+]cyt, as cell-to-cell spreading of the [Ca2+]cyt wave is impaired in the jue1. To conclude, we report a plant mechanosensitive ion channel involved in touch-triggered organ movement by modulating calcium dynamics.