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  • Title: ZIFL1.1 transporter modulates polar auxin transport by stabilizing membrane abundance of multiple PINs in Arabidopsis root tip.
    Author: Remy E, Baster P, Friml J, Duque P.
    Journal: Plant Signal Behav; 2013 Oct; 8(10):doi: 10.4161/psb.25688. PubMed ID: 23857365.
    Abstract:
    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.
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