Phospholipase Dζ2 Drives Vesicular Secretion of Auxin for Its Polar Cell-Cell Transport in the Transition Zone of the Root Apex

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 pre...

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Published in:Plant signaling & behavior 2007-07, Vol.2 (4), p.240-244
Main Authors: Mancuso, Stefano, Marras, Anna Maria, Mugnai, Sergio, Schlicht, Markus, Žárský, Viktor, Li, Gang, Song, Li, Xue, Hong-Wei, Baluška, František
Format: Article
Language:English
Subjects:
Binding
Biology
Bioscience
Calcium
Cancer
Cell
cell walls
Cycle
endosomes
indole acetic acid
Landes
Organogenesis
phospholipases
Proteins
Research Paper
secretion
secretory granules
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Summary: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.
ISSN:1559-2316
1559-2324
1559-2324
DOI:10.4161/psb.2.4.4566