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<p>Elevated temperatures enhance plant root growth. We find that cell elongation significantly contributes to this response. While mutations in the auxin transcriptional pathway impair warmth-induced cell elongation, exogenous auxin inhibits this growth. Intriguingly, warmth increases auxin levels and the nuclear accumulation of TIR1/AFB2/AFB3, alongside Aux/IAA stabilisation. This apparent paradox is explained by the concurrent increase in nuclear AFB1, which stabilises Aux/IAAs and promotes cell elongation. Notably, despite enhancing Aux/IAA stability, warmth also promotes ARF transcriptional activity. ARF7/19 are essential for warmth-induced cell growth and its inhibition by exogenous auxin. Warmth directly modulates ARF7/19 by reducing oligomerisation and cytoplasmic condensation, thereby enhancing their nuclear accumulation. This mechanism effectively repurposes the auxin pathway to regulate root cell growth in response to temperature.</p>

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Thermosensory reconfiguration of the auxin transcriptional pathway to drive root cell growth

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年3月27日

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  • María Belén Borniego,
  • Matías Ezequiel Pereyra,
  • Katelyn Sageman-Furnas,
  • Andrés Hugo Rossi,
  • Edward G. Wilkinson,
  • Lucia C. Strader,
  • Jorge J. Casal

摘要

Elevated temperatures enhance plant root growth. We find that cell elongation significantly contributes to this response. While mutations in the auxin transcriptional pathway impair warmth-induced cell elongation, exogenous auxin inhibits this growth. Intriguingly, warmth increases auxin levels and the nuclear accumulation of TIR1/AFB2/AFB3, alongside Aux/IAA stabilisation. This apparent paradox is explained by the concurrent increase in nuclear AFB1, which stabilises Aux/IAAs and promotes cell elongation. Notably, despite enhancing Aux/IAA stability, warmth also promotes ARF transcriptional activity. ARF7/19 are essential for warmth-induced cell growth and its inhibition by exogenous auxin. Warmth directly modulates ARF7/19 by reducing oligomerisation and cytoplasmic condensation, thereby enhancing their nuclear accumulation. This mechanism effectively repurposes the auxin pathway to regulate root cell growth in response to temperature.