The multiple mechanosensitive responses of wood formation to bending
Résumé
When submitted to recurrent mechanical stimulations such as wind-related stem bending, trees modify their stature thanks to a syndrome of growth and developmental responses called thigmomorphogenesis. Wood formation is one such key process modulated by bending.
We hypothesized that different local strains may generate specific growth and wood differentiation responses, and that the perceived number of stimulations could be a driver of wood formation.
This work led us to propose new terminologies to distinguish wood produced under transient tensile strain (tensile flexure wood; TFW) or under transient compressive strain (compressive flexure wood; CFW). By highlighting similarities and differences between tension wood and TFW, by demonstrating that plants could have the ability to discriminate positive from negative strains, and by demonstrating that poplars adjust wood formation according to the number of bending stimulations, this work provides new insight into the mechanisms of mechanosensitivity in plants.
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Cite hal-04846836 Article Jeanne Roignant, Éric Badel, Nathalie Leblanc-Fournier, Nicole Brunel-Michac, Julien Ruelle, et al.. Responses of wood formation to bending: a matter of dose and sensitivity adjustments. Trees - Structure and Function, 2024, 38 (5), pp.1137-1150. ⟨10.1007/s00468-024-02541-6⟩. ⟨hal-04846836⟩