SCF^TIR1 AFB-auxin signalling regulates PIN vacuolar trafficking and auxin fluxes during root gravitropism

P. Baster, S. Robert, J. Kleine Vehn, S. Vanneste, U. Kania, W. Grunewald, B. De Rybel, T. Beeckman, J. Friml, EMBO Journal 32 (2013) 260–274.


Journal Article | Published | English
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Abstract
The distribution of the phytohormone auxin regulates many aspects of plant development including growth response to gravity. Gravitropic root curvature involves coordinated and asymmetric cell elongation between the lower and upper side of the root, mediated by differential cellular auxin levels. The asymmetry in the auxin distribution is established and maintained by a spatio-temporal regulation of the PIN-FORMED (PIN) auxin transporter activity. We provide novel insights into the complex regulation of PIN abundance and activity during root gravitropism. We show that PIN2 turnover is differentially regulated on the upper and lower side of gravistimulated roots by distinct but partially overlapping auxin feedback mechanisms. In addition to regulating transcription and clathrin-mediated internalization, auxin also controls PIN abundance at the plasma membrane by promoting their vacuolar targeting and degradation. This effect of elevated auxin levels requires the activity of SKP-Cullin-F-box TIR1/AFB (SCF TIR1/AFB)-dependent pathway. Importantly, also suboptimal auxin levels mediate PIN degradation utilizing the same signalling pathway. These feedback mechanisms are functionally important during gravitropic response and ensure fine-tuning of auxin fluxes for maintaining as well as terminating asymmetric growth.
Publishing Year
Date Published
2013-01-23
Journal Title
EMBO Journal
Volume
32
Issue
2
Page
260 - 274
IST-REx-ID

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Baster P, Robert S, Kleine Vehn J, et al. SCF^TIR1 AFB-auxin signalling regulates PIN vacuolar trafficking and auxin fluxes during root gravitropism. EMBO Journal. 2013;32(2):260-274. doi:10.1038/emboj.2012.310
Baster, P., Robert, S., Kleine Vehn, J., Vanneste, S., Kania, U., Grunewald, W., … Friml, J. (2013). SCF^TIR1 AFB-auxin signalling regulates PIN vacuolar trafficking and auxin fluxes during root gravitropism. EMBO Journal, 32(2), 260–274. https://doi.org/10.1038/emboj.2012.310
Baster, Pawel, Stéphanie Robert, Jürgen Kleine Vehn, Steffen Vanneste, Urszula Kania, Wim Grunewald, Bert De Rybel, Tom Beeckman, and Jirí Friml. “SCF^TIR1 AFB-Auxin Signalling Regulates PIN Vacuolar Trafficking and Auxin Fluxes during Root Gravitropism.” EMBO Journal 32, no. 2 (2013): 260–74. https://doi.org/10.1038/emboj.2012.310.
P. Baster et al., “SCF^TIR1 AFB-auxin signalling regulates PIN vacuolar trafficking and auxin fluxes during root gravitropism,” EMBO Journal, vol. 32, no. 2, pp. 260–274, 2013.
Baster P, Robert S, Kleine Vehn J, Vanneste S, Kania U, Grunewald W, De Rybel B, Beeckman T, Friml J. 2013. SCF^TIR1 AFB-auxin signalling regulates PIN vacuolar trafficking and auxin fluxes during root gravitropism. EMBO Journal. 32(2), 260–274.
Baster, Pawel, et al. “SCF^TIR1 AFB-Auxin Signalling Regulates PIN Vacuolar Trafficking and Auxin Fluxes during Root Gravitropism.” EMBO Journal, vol. 32, no. 2, Wiley-Blackwell, 2013, pp. 260–74, doi:10.1038/emboj.2012.310.

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