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Extracellular matrix sensing by FERONIA and Leucine‐Rich Repeat Extensins controls vacuolar expansion during cellular elongation in Arabidopsis thaliana

Type of publication Peer-reviewed
Publikationsform Original article (peer-reviewed)
Author Dünser Kai, Gupta Shibu, Herger Aline, Feraru Mugurel I, Ringli Christoph, Kleine‐Vehn Jürgen,
Project Analysis of LRX proteins as potential regulators of Ca2+ fluxes
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Original article (peer-reviewed)

Journal The EMBO Journal
Volume (Issue) 38(7)
Page(s) e100353 - e100353
Title of proceedings The EMBO Journal
DOI 10.15252/embj.2018100353

Abstract

Cellular elongation requires the defined coordination of intra- and extracellular processes, but the underlying mechanisms are largely unknown. The vacuole is the biggest plant organelle, and its dimensions play a role in defining plant cell expansion rates. Here, we show that the increase in vacuolar occupancy enables cellular elongation with relatively little enlargement of the cytosol in Arabidopsis thaliana. We demonstrate that cell wall properties are sensed and impact on the intracellular expansion of the vacuole. Using vacuolar morphology as a quantitative read-out for intracellular growth processes, we reveal that the underlying cell wall sensing mechanism requires interaction of extracellular leucinerich repeat extensins (LRXs) with the receptor-like kinase FERONIA (FER). Our data suggest that LRXs link plasma membrane-localised FER with the cell wall, allowing this module to jointly sense and convey extracellular signals to the cell. This mechanism coordinates the onset of cell wall acidification and loosening with the increase in vacuolar size.
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