AUX1-mediated root hair auxin influx governs SCFTIR1/AFB-type Ca2+ signaling

Dindas, Julian and Scherzer, Sönke and Roelfsema, M. Rob G. and von Meyer, Katharina and Müller, Heike M. and Al-Rasheid, K.A.S. and Palme, Klaus and Dietrich, Petra and Becker, Dirk and Bennett, Malcolm J. and Hedrich, Rainer (2018) AUX1-mediated root hair auxin influx governs SCFTIR1/AFB-type Ca2+ signaling. Nature Communications, 9 (1). 1174/1-1174/10. ISSN 2041-1723

[img]
Preview
PDF - Requires a PDF viewer such as GSview, Xpdf or Adobe Acrobat Reader
Available under Licence Creative Commons Attribution.
Download (2MB) | Preview

Abstract

Auxin is a key regulator of plant growth and development, but the causal relationship between hormone transport and root responses remains unresolved. Here we describe auxin uptake, together with early steps in signaling, in Arabidopsis root hairs. Using intracellular microelectrodes we show membrane depolarization, in response to IAA in a concentration- and pH-dependent manner. This depolarization is strongly impaired in aux1 mutants, indicating that AUX1 is the major transporter for auxin uptake in root hairs. Local intracellular auxin application triggers Ca2+ signals that propagate as long-distance waves between root cells and modulate their auxin responses. AUX1-mediated IAA transport, as well as IAA- triggered calcium signals, are blocked by treatment with the SCFTIR1/AFB - inhibitor auxinole. Further, they are strongly reduced in the tir1afb2afb3 and the cngc14 mutant. Our study reveals that the AUX1 transporter, the SCFTIR1/AFB receptor and the CNGC14 Ca2+ channel, mediate fast auxin signaling in roots.

Item Type: Article
Schools/Departments: University of Nottingham, UK > Faculty of Science > School of Biosciences > Division of Plant and Crop Sciences
Identification Number: https://doi.org/10.1038/s41467-018-03582-5
Depositing User: Eprints, Support
Date Deposited: 17 Jul 2018 10:45
Last Modified: 17 Jul 2018 11:00
URI: http://eprints.nottingham.ac.uk/id/eprint/52988

Actions (Archive Staff Only)

Edit View Edit View