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ZIFL1.1 transporter modulates polar auxin transport by stabilizing membrane abundance of multiple PINs inArabidopsisroot tip

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Summary:Cell-to-cell directional flow of the phytohormone auxin is primarily established by polar localization of the PIN auxin transporters, a process tightly regulated at multiple levels by auxin itself. We recently reported that, in the context of strong auxin flows, activity of the vacuolar ZIFL1.1 transporter is required for fine-tuning of polar auxin transport rates in the Arabidopsis root. In particular, ZIFL1.1 function protects plasma-membrane stability of the PIN 2 carrier in epidermal root tip cells under conditions normally triggering PIN 2 degradation. Here, we show that ZIFL1.1 activity at the root tip also promotes PIN 1 plasma-membrane abundance in central cylinder cells, thus supporting the notion that ZIFL1.1 acts as a general positive modulator of polar auxin transport in roots.
Main Authors:Remy, Estelle
Other Authors:Baster, Pawel; Friml, Jiří; Duque, Paula
Subject:Arabidopsis thaliana Major Facilitator Superfamily PIN transporters polar auxin transport root development
Year:2013
Country:Portugal
Document type:article
Access type:open access
Associated institution:Repositório do GIMM – Gulbenkian Institute for Molecular Medicine
Language:English
Origin:ARCA

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