Thigmonastic response is mediated by touch-stimulated auxin signaling in cucumber tendrils

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ID: 322438
2026
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Abstract
Thigmonasty is a fast and fascinating touch-stimulated response in plants. However, the molecular mechanism underlying this response is poorly understood. Here, the thigmonastic response (coiling) of tendrils in cucumber was investigated. The tendril exhibited a dorsal-ventral asymmetric structure and sensed touch stimuli via its ventral side. Touch stimuli initially induced contact coiling and then basipetally translocated to induce free coiling in tendrils. Indole-3-acetic acid (IAA) and its biosynthesis genes exhibited in a touch-dependent pattern in tendrils. NAA (α-Naphthaleneacetic acid) treatment induced tendril coiling without touch stimuli, whereas Kyn (L-kynurenine) + PPBo (4-phenoxyphenylboronic acid) treatment inhibited touch-stimulated tendril coiling. In situ gene detection and TRSV-based gene silencing assay showed that CsaYUC7 (a YUCCA family member) was the key gene for touch-stimulated tendril coiling, and CsaYUC7 was directly regulated by the calmodulin-binding transcription activator CsaCAMTA4 in response to touch-induced Ca2+ signaling in tendrils. Our works showed touch-stimulated auxin biosynthesis and basipetally transportation in mediating tendril coiling, and it was regulated by a touch dependent Ca2+-CsaCAMTA4-CsaYUC7-auxin pathway, revealing the underlying signaling pathway and driving force of tendril coiling in cucumber.
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Authors Z Y Li, Longlong Zheng, Jiaqi Pan, Yue Wang, Fang Lv, Chenhao Zhou, X Wang, Yong He, Zhujun Zhu, Yunmin Xu
Journal Plant physiology and biochemistry : PPB
Year 2026
DOI
10.1093/plphys/kiag541
URL
https://doi.org/10.1093/plphys/kiag541
Keywords Keywords not found

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