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Cytoskeleton Dynamics Are Necessary for Early Events of Lateral Root Initiation in Arabidopsis

Type of publication Peer-reviewed
Publikationsform Original article (peer-reviewed)
Author Vilches Barro Amaya, Stöckle Dorothee, Thellmann Martha, Ruiz-Duarte Paola, Bald Lotte, Louveaux Marion, von Born Patrick, Denninger Philipp, Goh Tatsuaki, Fukaki Hidehiro, Vermeer Joop E.M., Maizel Alexis,
Project Talking with the neighbours: Understanding spatial accommodation during plant development
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Original article (peer-reviewed)

Journal Current Biology
Page(s) 1
Title of proceedings Current Biology
DOI 10.1016/j.cub.2019.06.039

Open Access

URL http://doi.org/10.1016/j.cub.2019.06.039
Type of Open Access Publisher (Gold Open Access)

Abstract

How plant cells re-establish differential growth to initiate organs is poorly understood. Morphogenesis of lateral roots relies on the asymmetric cell division of initially symmetric founder cells. This division is preceded by the tightly controlled asymmetric radial expansion of these cells. The cellular mechanisms that license and ensure the coordination of these events are unknown. Here, we quantitatively analyze microtubule and F-actin dynamics during lateral root initiation. Using mutants and pharmacological and tissue-specific genetic perturbations, we show that dynamic reorganization of both microtubule and F-actin networks is necessary for the asymmetric expansion of the founder cells. This cytoskeleton remodeling intertwines with auxin signaling in the pericycle and endodermis in order for founder cells to acquire a basic polarity required for initiating lateral root development. Our results reveal the conservation of cell remodeling and polarization strategies between the Arabidopsis zygote and lateral root founder cells. We propose that coordinated, auxin-driven reorganization of the cytoskeleton licenses asymmetric cell growth and divisions during embryonic and post-embryonic organogenesis.
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