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Poster De Conférence Année : 2018

The multiple mechanosensitive responses of wood formation to bending: Anatomical and wood properties consequences

Résumé

Background and Aims Trees constantly experience wind, perceive resulting mechanical cues, and modify their growth and development accordingly. Previous studies have demonstrated that multiple bending treatments trigger ovalization of the stem and the formation of flexure wood in gymnosperms, but ovalization and flexure wood have rarely been studied in angiosperms, and none of the experiments conducted so far has used multidirectional bending treatments at controlled intensities. Assuming that bending involves tensile and compressive strain, we hypothesized that different local strains may generate specific growth and wood differentiation responses.• Methods Basal parts of young poplar stems were subjected to multiple transient controlled unidirectional bending treatments, which enabled a distinction to be made between the wood formed under tensile or compressive flexural strains. Local analyses of poplar stem responses were performed at growth, anatomical, biochemical and molecular levels. Moreover local wood properties were investigated.• Key Results Treated poplar stems developed significant cross-sectional ovalization. At the tissue level, some aspects of wood differentiation were similarly modulated in the compressed and stretched zones (vessel frequency and diameter of fibres without a G-layer), whereas other anatomical traits (vessel diameter, G-layer formation, diameter of fibres with a G-layer and microfibril angle) and the expression of fasciclin-encoding genes were differentially modulated in the two zones. Wood showed differential properties too.• Conclusions We propose new terminologies to distinguish the ‘flexure wood’ produced in response to multiple bidirectional bending treatments from 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 and by demonstrating that plants could have the ability to discriminate positive strains from negative strains, this work provides new insight into the mechanisms of mechanosensitivity in plants.
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Dates et versions

hal-01893948 , version 1 (11-10-2018)

Identifiants

  • HAL Id : hal-01893948 , version 1
  • PRODINRA : 449094

Citer

Eric Badel, Jeanne Roignant, Benjamin Niez, Nathalie Leblanc-Fournier, Nicole Brunel-Michac, et al.. The multiple mechanosensitive responses of wood formation to bending: Anatomical and wood properties consequences. 9th International Plant Biomechanics Conference, Aug 2018, Montreal, Canada. PBM2018, 152 p., 2018, 9th International Plant Biomechanics Conference. ⟨hal-01893948⟩
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