Coordination of tissue cell polarity by auxin transport and signaling.

Autor:	Verna C; Department of Biological Sciences, University of Alberta, Edmonton, Canada., Ravichandran SJ; Department of Biological Sciences, University of Alberta, Edmonton, Canada., Sawchuk MG; Department of Biological Sciences, University of Alberta, Edmonton, Canada., Linh NM; Department of Biological Sciences, University of Alberta, Edmonton, Canada., Scarpella E; Department of Biological Sciences, University of Alberta, Edmonton, Canada.
Jazyk:	angličtina
Zdroj:	ELife [Elife] 2019 Dec 03; Vol. 8. Date of Electronic Publication: 2019 Dec 03.
DOI:	10.7554/eLife.51061
Abstrakt:	Plants coordinate the polarity of hundreds of cells during vein formation, but how they do so is unclear. The prevailing hypothesis proposes that GNOM, a regulator of membrane trafficking, positions PIN-FORMED auxin transporters to the correct side of the plasma membrane; the resulting cell-to-cell, polar transport of auxin would coordinate tissue cell polarity and induce vein formation. Contrary to predictions of the hypothesis, we find that vein formation occurs in the absence of PIN-FORMED or any other intercellular auxin-transporter; that the residual auxin-transport-independent vein-patterning activity relies on auxin signaling; and that a GNOM -dependent signal acts upstream of both auxin transport and signaling to coordinate tissue cell polarity and induce vein formation. Our results reveal synergism between auxin transport and signaling, and their unsuspected control by GNOM in the coordination of tissue cell polarity during vein patterning, one of the most informative expressions of tissue cell polarization in plants. Competing Interests: CV, SR, MS, NL, ES No competing interests declared (© 2019, Verna et al.)
Databáze:	MEDLINE
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