Arabidopsis PIN2 protein directs transport of the phytohormone auxin from the root tip into the root elongation zone. Variation in hormone transport, which depends on a delicate interplay between PIN2 sorting to and from polar plasma membrane domains, determines root growth. By employing a constitutively degraded version of PIN2, we identify brassinolides as antagonists of PIN2 endocytosis. This response does not require de novo protein synthesis, but involves early events in canonical brassinolide signaling. Brassinolide-controlled adjustments in PIN2 sorting and intracellular distribution governs formation of a lateral PIN2 gradient in gravistimulated roots, coinciding with adjustments in auxin signaling and directional root growth. Strikingly, simulations indicate that PIN2 gradient formation is no prerequisite for root bending but rather dampens asymmetric auxin flow and signaling. Crosstalk between brassinolide signaling and endocytic PIN2 sorting, thus, appears essential for determining the rate of gravity-induced root curvature via attenuation of differential cell elongation.

Boehringer Ingelheim RCV Doktor Boehringer Gasse 5 11 1120 Wien Austria

Department of Applied Genetics and Cell Biology University of Natural Resources and Life Sciences Vienna Muthgasse 18 1190 Wien Austria

Department of Experimental Plant Biology Faculty of Science Charles University 128 44 Prague 2 Prague Czech Republic

Institute of Experimental Botany of the Czech Academy of Sciences Rozvojová 263 Praha 6 165 02 Praha Czech Republic

Institute of Science and Technology Austria Am Campus 1 3400 Klosterneuburg Austria

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