We present a three-dimensional morphoelastic rod model capable to describe the morphogenesis of growing plant shoots driven by differential growth. We discuss the evolution laws for endogenous oscillators, straightening mechanisms, and reorientations to directional cues, such as gravitropic reactions governed by the avalanche dynamics of statoliths. We use this model to investigate the role of elastic deflections due to gravity loading in circumnutating plant shoots. We show that, in the absence of endogenous cues, pendular and circular oscillations arise as a critical length is attained, thus suggesting the occurrence of an instability triggered by exogenous factors. When also oscillations due to endogenous cues are present, their weight relative to those associated with the instability varies in time as the shoot length and other biomechanical properties change. Thanks to the simultaneous occurrence of these two oscillatory mechanisms, we are able to reproduce a variety of complex behaviors, including trochoid-like patterns, which evolve into circular orbits as the shoot length increases, and the amplitude of the exogenous oscillations becomes dominant.

Nutations in plant shoots: endogenous and exogenous factors in the presence of mechanical deformations / Agostinelli, Daniele; Desimone, Antonio; Noselli, Giovanni. - In: FRONTIERS IN PLANT SCIENCE. - ISSN 1664-462X. - 12:(2021), pp. 1-12. [10.3389/fpls.2021.608005]

Nutations in plant shoots: endogenous and exogenous factors in the presence of mechanical deformations

Agostinelli, Daniele
;
DeSimone, Antonio;Noselli, Giovanni
2021-01-01

Abstract

We present a three-dimensional morphoelastic rod model capable to describe the morphogenesis of growing plant shoots driven by differential growth. We discuss the evolution laws for endogenous oscillators, straightening mechanisms, and reorientations to directional cues, such as gravitropic reactions governed by the avalanche dynamics of statoliths. We use this model to investigate the role of elastic deflections due to gravity loading in circumnutating plant shoots. We show that, in the absence of endogenous cues, pendular and circular oscillations arise as a critical length is attained, thus suggesting the occurrence of an instability triggered by exogenous factors. When also oscillations due to endogenous cues are present, their weight relative to those associated with the instability varies in time as the shoot length and other biomechanical properties change. Thanks to the simultaneous occurrence of these two oscillatory mechanisms, we are able to reproduce a variety of complex behaviors, including trochoid-like patterns, which evolve into circular orbits as the shoot length increases, and the amplitude of the exogenous oscillations becomes dominant.
2021
12
1
12
608005
https://doi.org/10.3389/fpls.2021.608005
https://www.frontiersin.org/article/10.3389/fpls.2021.608005
https://www.biorxiv.org/content/10.1101/2020.07.06.188987v1
Agostinelli, Daniele; Desimone, Antonio; Noselli, Giovanni
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.11767/119409
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