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ABCG36/PEN3/PDR8 Is an Exporter of the Auxin Precursor, Indole-3-Butyric Acid, and Involved in Auxin-Controlled Development

Aryal, Bibek ; Huynh, John ; Schneuwly, Jerôme ; Siffert, Alexandra ; Liu, Jie ; Alejandro, Santiago ; Ludwig-Müller, Jutta ; Martinoia, Enrico ; Geisler, Markus

In: Frontiers in Plant Science, 2019, vol. 10, p. -

The PDR-type ABCG transporter, ABCG36/PDR8/PEN3, is thought to be implicated in the export of a few structurally unrelated substrates, including the auxin precursor, indole-3-butyric acid (IBA), although a clear-cut proof of transport is lacking. An outward facing, lateral root (LR) location for ABCG36 fuelled speculations that it might secrete IBA into the rhizosphere. Here, we provide...