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Research Paper
Phospholipase Dζ2 Drives Vesicular Secretion of Auxin for Its Polar Cell-Cell Transport in the Transition Zone of the Root Apex
Stefano Mancuso, Anna Maria Marras, Sergio Mugnai, Markus Schlicht, Viktor Zársky, Gang Li, Li Song, Hong-Wei Xue and Frantisek Baluska
volume 2 | issue 4
july/august 2007Pages: 240 - 244
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Auxin (IAA) is versatile signaling molecule of plants, currently classified as plant hormone. But there are data suggesting that auxin is acting also as plant-specific morphogen, electric-responses inducing transmitter, and as general signaling molecule used for plant-bacteria communication. Our previous data revealed that auxin is associated with secretory endosomes and also highly enriched within cell walls of cells active in transcellular auxin transport. Our present data, based on in vivo non-invasive auxin flux recordings, reveal that auxin is secreted out of synaptic-like domains specialized for efflux of auxin in root apex cells highly active in polar cell-cell transport of auxin. We obtained both genetic and pharmacological evidence that phospholipase Dζ2 drives vesicular secretion of auxin for its polar transcellular transport in the transition zone of the root apex. Secretion of auxin via secretory vesicles has far-reaching consequences not only for our understanding of cell-cell auxin transport but also for plant sciences as a whole.
Authors
Stefano Mancuso
IZMB & LINV; University of Florence; Florency, Italy
Anna Maria Marras
University of Florence; Florence, Italy
Sergio Mugnai
University of Florence; Florence, Italy
Markus Schlicht
University of Bonn; Bonn, Germany
Viktor Zársky
Charles University; Praha, Czech Republic
Gang Li
Chinese Academy of Sciences; Shanghai, PR China
Li Song
Chinese Academy of Sciences; Shanghai, PR China
Hong-Wei Xue
Chinese Academy of Sciences; Shanghai, PR China
Frantisek Baluska
University of Bonn, Institute of Cell and Molecular Botany; Bonn, Germany
We now provide open access to journal articles published online for one year or more. This article may be downloaded at the following link:
Download PDF If the document does not open, please right-click on the link (control-click on a Macintosh) and select the option to save the file to disk.