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Are Maize Stalks Efficiently Tapered to Withstand Wind Induced Bending Stresses?

Christopher J Stubbs, Kate Seegmiller, Rajandeep S. Sekhon, View ORCID ProfileDaniel J. Robertson
doi: https://doi.org/10.1101/2020.01.21.914804
Christopher J Stubbs
1Department of Mechanical Engineering, University of Idaho, 875 Perimeter Dr. MS0902, Moscow, ID, 83844, 208.885.1113,
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  • For correspondence: cstubbs@uidaho.edu
Kate Seegmiller
2Department of Mechanical Engineering, University of Idaho, 875 Perimeter Dr. MS0902, Moscow, ID, 83844, 208.885.7889,
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  • For correspondence: pete7111@vandals.uidaho.edu
Rajandeep S. Sekhon
3Department of Genetics and Biochemistry, Clemson University, Biosystems Research Complex, Clemson, SC, 29634,
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  • For correspondence: sekhon@clemson.edu
Daniel J. Robertson
4Department of Mechanical Engineering, University of Idaho, 875 Perimeter Dr. MS0902, Moscow, ID, 83844, 208.885.7889,
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  • ORCID record for Daniel J. Robertson
  • For correspondence: danieljr@uidaho.edu danieljr@uidaho.edu
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Abstract

Stalk lodging (breaking of agricultural plant stalks prior to harvest) results in millions of dollars in lost revenue each year. Despite a growing body of literature on the topic of stalk lodging, the structural efficiency of maize stalks has not been investigated previously. In this study, we investigate the morphology of mature maize stalks to determine if rind tissues, which are the major load bearing component of corn stalks, are efficiently organized to withstand wind induced bending stresses that cause stalk lodging.

945 fully mature, dried commercial hybrid maize stem specimens (48 hybrids, ∼2 replicates, ∼10 samples per plot) were subjected to: (1) three-point-bending tests to measure their bending strength and (2) rind penetration tests to measure the cross-sectional morphology at each internode. The data were analyzed through an engineering optimization algorithm to determine the structural efficiency of the specimens.

Hybrids with higher average bending strengths were found to allocate rind tissue more efficiently than weaker hybrids. However, even strong hybrids were structurally suboptimal. There remains significant room for improving the structural efficiency of maize stalks. Results also indicated that stalks are morphologically organized to resist wind loading that occurs primarily above the ear. Results are applicable to selective breeding and crop management studies seeking to reduce stalk lodging rates.

Highlight Maize stem morphology was investigated through an optimization algorithm to determine how efficiently their structural tissues are allocated to withstand wind induced bending stresses that cause stalk lodging.

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The copyright holder for this preprint is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under a CC-BY-NC-ND 4.0 International license.
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Posted January 23, 2020.
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Are Maize Stalks Efficiently Tapered to Withstand Wind Induced Bending Stresses?
Christopher J Stubbs, Kate Seegmiller, Rajandeep S. Sekhon, Daniel J. Robertson
bioRxiv 2020.01.21.914804; doi: https://doi.org/10.1101/2020.01.21.914804
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Are Maize Stalks Efficiently Tapered to Withstand Wind Induced Bending Stresses?
Christopher J Stubbs, Kate Seegmiller, Rajandeep S. Sekhon, Daniel J. Robertson
bioRxiv 2020.01.21.914804; doi: https://doi.org/10.1101/2020.01.21.914804

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