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657100.pdf (11.72 MB)

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2015

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cc-by (c) Fabregas Vallvé, Norma et al., 2015
Si us plau utilitzeu sempre aquest identificador per citar o enllaçar aquest document: https://hdl.handle.net/2445/104351

Auxin influx carriers control vascular patterning and xylem differentiation in Arabidopsis thaliana

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https://doi.org/10.1371/journal.pgen.1005183

Resum

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

Matèries

Diferenciació cel·lular, Arabidopsis thaliana, Fenotip

Matèries (anglès)

Cell diferentiation, Arabidopsis thaliana, Phenotype

Citació

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Articles publicats en revistes (Física de la Matèria Condensada)

Citació

FABREGAS VALLVÉ, Norma, et al. Auxin influx carriers control vascular patterning and xylem differentiation in Arabidopsis thaliana. PLoS Genetics. 2015. Vol. 11, num. 4, pags. e1005183. ISSN 1553-7390. [consulted: 3 of August of 2026]. Available at: https://hdl.handle.net/2445/104351

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