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Structure-property relationships in mechanically stimulated Sorghum bicolor stalks

Marie-Louise Lemloh / Anna Pohl / Eva Weber
  • INM - Leibniz Institute for New Materials, Campus D2 2, 66123, Saarbruecken, Germany
  • Department of Materials Engineering and the Russell Berrie Nanotechnology Institute, Technion Israel Institute of Technology, Haifa 32000, Israel
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ Marco Zeiger / Petra Bauer
  • Saarland University, Department of Biosciences - Plant Biology, Campus A2 4, 66123 Saarbruecken, Germany
  • Heinrich Heine University, Institute of Botany, Universitaetsstr. 1, 40225 Duesseldorf, Germany
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ Ingrid M. Weiss / Andreas S. Schneider
Published Online: 2014-09-30 | DOI: https://doi.org/10.2478/bima-2014-0001

Abstract

Mechanical properties of plants and underlying structure-property relationships are important for agricultural purposes as well as for biomimetic concepts. In this study, the effect of mechanical stimulation on morphology and bending properties of the stalk was investigated for Sorghum bicolor (Poaceae), a widely used drought-tolerant biomass grass. An experimental set-up allowing for defined growth and mechanical perturbation (flexing) during a defined growth period was designed. Mechanical properties of individual internodes of the stalk were determined by three-point bending tests. We found that the three investigated lines showed differences in their general bending strength in the non-stimulated condition. However, similar high range of bending strength values was measured for all plant lines after they underwent the mechanical stimulation procedure. The anatomy of internode cross-sections was examined to evaluate structure-property relationships. An increased thickness of the outer sclerenchymatous tissue was observed for internodes with higher bending strength values. Dried internodes fail under lower strains but showed higher bending strength. These findings show that mechanosensitivity in sorghum is dependent on genetic as well as environmental factors. The experimental system presented here offers new straight-forward possibilities for S. bicolor line selection for applications requiring mechanical strength of the stalk.

Keywords : Poaceae; Sorghum bicolor; stalk; internode; mechanical properties; three-point bending; bending strength; thigmomorphogenesis; mechanical stimulation; sclerenchyma

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About the article

Received: 2014-02-20

Accepted: 2014-08-08

Published Online: 2014-09-30


Citation Information: Bioinspired Materials, Volume 1, Issue 1, ISSN (Online) 2300-3634, DOI: https://doi.org/10.2478/bima-2014-0001.

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© 2014 Marie-Louise Lemloh et al.. This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License. BY-NC-ND 3.0

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