The (un)likelihood of clock-driven lateral root priming; A modeling exploration

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ID: 321018
2026
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Abstract
Abstract Lateral root formation starts with priming, predisposing subsets of pericycle cells with the potential of future lateral root formation through semi-periodic elevations in auxin (signalling). While various mechanisms have been suggested, one frequently suggested hypothesis proposes a genetic, cell-autonomous root clock akin to the clock underlying vertebrate somitogenesis. Still, while gene expression variations were observed, so far this clock has not been proven. From a functional and evolutionary perceptive it is furthermore an open question whether lateral root priming is not more likely to arise from an emergent tissue level process similar to phyllotaxis. To help settle this debate in this study I use general knowledge of oscillator dynamics and simple models of auxin signalling to underline the unlikelihood of a root clock driving lateral root priming. I show how within a single cell oscillations are limited to a small parameter domain, with constraints intensifying due to the presence of multiple AUX/IAA and ARF types as well as auxin export. Furthermore, I demonstrate how non-meristem based oscillations, due to a lack of memory of oscillator phase, can not drive periodic prebranch site formation, and periodic inputs are insufficient to induce phase differences. Combined this underlines the unlikelihood of a root clock driving lateral root priming.
Reference Key
openalex_W7168237728 Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Kirsten H ten Tusscher
Journal The Plant cell
Year 2026
DOI
10.1093/plcell/koag213
URL
https://doi.org/10.1093/plcell/koag213
Keywords Keywords not found

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