A mathematical model explores the contributions of bending and stretching forces to shoot gravitropism in Arabidopsis

Plant shoot gravitropism is a complex phenomenon resulting from gravity sensing, curvature sensing (proprioception), the ability to uphold self-weight and growth. Although recent data analysis and modelling have revealed the detailed morphology of shoot bending, the relative contribution of bending...

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Bibliographic Details
Published in:Quantitative plant biology 2020, Vol.1, p.e4-e4, Article e4
Main Authors: Tsugawa, Satoru, Sano, Tomohiko G, Shima, Hiroyuki, Morita, Miyo Terao, Demura, Taku
Format: Article
Language:English
Subjects:
Bending
Data analysis
Gravitropism
Gravity
mathematical model
Mathematical models
Morphology
Mutants
Original
plant biomechanics
Proprioception
quantitative plant biology
Sedimentation & deposition
shoot gravitropism
Signal transduction
Stretching
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Summary:Plant shoot gravitropism is a complex phenomenon resulting from gravity sensing, curvature sensing (proprioception), the ability to uphold self-weight and growth. Although recent data analysis and modelling have revealed the detailed morphology of shoot bending, the relative contribution of bending force (derived from the gravi-proprioceptive response) and stretching force (derived from shoot axial growth) behind gravitropism remains poorly understood. To address this gap, we combined morphological data with a theoretical model to analyze shoot bending in wild-type and mutant . Using data from actual bending events, we searched for model parameters that minimized discrepancies between the data and mathematical model. The resulting model suggests that both the bending force and the stretching force differ significantly between the wild type and mutant. We discuss the implications of the mechanical forces associated with differential cell growth and present a plausible mechanical explanation of shoot gravitropism.
ISSN:2632-8828
2632-8828
DOI:10.1017/qpb.2020.5