Journal
NATURE COMMUNICATIONS
Volume 10, Issue -, Pages -Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/s41467-019-13543-1
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Funding
- Austrian Science Fund [FWF P25931, P31493, M2379-B28]
- Ministry of Education, Youth and Sports of Czech Republic from European Regional Development Fund 'Centre for Experimental Plant Biology' [CZ.02.1.01/0.0/0.0/16_019/0000738]
- Czech Science Foundation [19-13375Y]
- Czech Academy of Sciences [MSM200381701]
- Austrian Academy of Sciences (OAW)
- EU OPPC [CZ.2.16/3.1.00/21519]
- MEYS Czech Republic [CZ.02.1.01/0.0/0.0/16_013/0001775]
- Austrian Science Fund (FWF) [P31493, M2379] Funding Source: Austrian Science Fund (FWF)
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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.
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