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Title: Auxin influx carriers control vascular patterning and xylem differentiation in Arabidopsis thaliana
Author: Fabregas Vallvé, Norma
Formosa Jordan, Pau
Ibañes Miguez, Marta
Confraria, Ana
Siligato, Riccardo
Alonso, Jose M.
Swarup, Ranjan
Bennett, Malcolm J.
Pekka Mähönen, Ari
Caño Delgado, Ana I.
Keywords: Diferenciació cel·lular
Arabidopsis thaliana
Cell diferentiation
Arabidopsis thaliana
Issue Date: 2015
Publisher: Public Library of Science (PLoS)
Abstract: Auxin is an essential hormone for plant growth and development. Auxin influx carriers AUX1/LAX transport auxin into the cell, while auxin efflux carriers PIN pump it out of the cell. It is well established that efflux carriers play an important role in the shoot vascular pat- terning, yet the contribution of influx carriers to the shoot vasculature remains unknown. Here, we combined theoretical and experimental approaches to decipher the role of auxin influx carriers in the patterning and differentiation of vascular tissues in the Arabidopsis in- florescence stem. Our theoretical analysis predicts that influx carriers facilitate periodic pat- terning and modulate the periodicity of auxin maxima. In agreement, we observed fewer and more spaced vascular bundles in quadruple mutants plants of the auxin influx carriers aux1lax1lax2lax3 . Furthermore, we show AUX1/LAX carriers promote xylem differentiation in both the shoot and the root tissues. Influx carriers increase cytoplasmic auxin signaling, and thereby differentiation. In addition to this cytoplasmic role of auxin, our computational simulations propose a role for extracellular auxin as an inhibitor of xylem differentiation. Al- together, our study shows that auxin influx carriers AUX1/LAX regulate vascular patterning and differentiation in plants
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It is part of: PLoS Genetics, 2015, vol. 11, num. 4, p. e1005183
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ISSN: 1553-7390
Appears in Collections:Articles publicats en revistes (Física de la Matèria Condensada)

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