Localization of the auxin permease AUX1 suggests two functionally distinct hormone transport pathways operate in the
                    <i>Arabidopsis</i>
                    root apex

Ranjan Swarup, Jirı́ Friml, Alan Marchant, Karin Ljung, Goran Sandberg, Klaus Palme, Malcolm Bennett

doi:10.1101/gad.210501

<jats:p> Auxins represent an important class of plant hormone that regulate plant development. Plants use specialized carrier proteins to transport the auxin indole-3-acetic acid (IAA) to target tissues. To date, efflux carrier-mediated polar auxin transport has been assumed to represent the sole mode of long distance IAA movement. Localization of the auxin permease AUX1 in the <jats:italic>Arabidopsis</jats:italic> root apex has revealed a novel phloem-based IAA transport pathway. AUX1, asymmetrically localized to the plasma membrane of root protophloem cells, is proposed to promote the acropetal, post-phloem movement of auxin to the root apex. MS analysis shows that IAA accumulation in <jats:italic>aux1</jats:italic> mutant root apices is impaired, consistent with an AUX1 phloem unloading function. AUX1 localization to columella and lateral root cap tissues of the <jats:italic>Arabidopsis</jats:italic> root apex reveals that the auxin permease regulates a second IAA transport pathway. Expression studies using an auxin-regulated reporter suggest that AUX1 is necessary for root gravitropism by facilitating basipetal auxin transport to distal elongation zone tissues. </jats:p>

Localization of the auxin permease AUX1 suggests two functionally distinct hormone transport pathways operate in the <i>Arabidopsis</i> root apex

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