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Research article - Peer-reviewed, 2022

PIN-FORMED1 polarity in the plant shoot epidermis is insensitive to the polarity of neighboring cells

Kareem, Abdul; Bhatia, Neha; Ohno, Carolyn; Heisler, Marcus G.

Abstract

At the Arabidopsis shoot apex, epidermal cells are planar-polarized along an axis marked by the asymmetric localization patterns of several proteins including PIN-FORMED1 (PIN1), which facilitates the directional efflux of the plant hormone auxin to pattern phyllotaxis. While PIN1 polarity is known to be regulated non -cell autonomously via the MONOPTEROS (MP) transcription factor, how this occurs has not been determined. Here, we use mosaic expression of the serine threonine kinase PINOID (PID) to test whether PIN1 polarizes according to the polarity of neighboring cells. Our findings reveal that PIN1 is insensitive to the po-larity of PIN1 in neighboring cells arguing against auxin flux or extracellular auxin concentrations acting as a polarity cue, in contrast to previous model proposals.

Published in

iScience
2022, volume: 25, number: 10, article number: 105062
Publisher: CELL PRESS

Authors' information

Valiya Kadavu, Abdul Kareem
Swedish University of Agricultural Sciences, Department of Plant Biology
Valiya Kadavu, Abdul Kareem
University of Sydney
Bhatia, Neha
European Molecular Biology Laboratory (EMBL)
Bhatia, Neha
Max Planck Society
Ohno, Carolyn
University of Sydney
Ohno, Carolyn
European Molecular Biology Laboratory (EMBL)
Heisler, Marcus G.
European Molecular Biology Laboratory (EMBL)
Heisler, Marcus G.
University of Sydney

UKÄ Subject classification

Developmental Biology
Plant Biotechnology

Publication Identifiers

DOI: https://doi.org/10.1016/j.isci.2022.105062

URI (permanent link to this page)

https://res.slu.se/id/publ/120508