Journal Article

Emerging models on the regulation of intercellular transport by plasmodesmata-associated callose

Sam Amsbury, Philip Kirk and Yoselin Benitez-Alfonso

in Journal of Experimental Botany

Volume 69, issue 1 Published in print December 2017 | ISSN: 0022-0957
Published online October 2017 | e-ISSN: 1460-2431 | DOI: https://dx.doi.org/10.1093/jxb/erx337
Emerging models on the regulation of intercellular transport by plasmodesmata-associated callose

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Abstract

The intercellular transport of molecules through membranous channels that traverse the cell walls—so-called plasmodesmata—is of fundamental importance for plant development. Regulation of plasmodesmata aperture (and transport capacity) is mediated by changes in the flanking cell walls, mainly via the synthesis/degradation (turnover) of the (1,3)-β-glucan polymer callose. The role of callose in organ development and in plant environmental responses is well recognized, but detailed understanding of the mechanisms regulating its accumulation and its effects on the structure and permeability of the channels is still missing. We compiled information on the molecular components and signalling pathways involved in callose turnover at plasmodesmata and, more generally, on the structural and mechanical properties of (1,3)-β-glucan polymers in cell walls. Based on this revision, we propose models integrating callose, cell walls, and the regulation of plasmodesmata structure and intercellular communication. We also highlight new tools and interdisciplinary approaches that can be applied to gain further insight into the effects of modifying callose in cell walls and its consequences for intercellular signalling.

Keywords: Callose; development; intercellular communication; plant signalling; plasmodesmata

Journal Article.  8929 words.  Illustrated.

Subjects: Plant Sciences and Forestry

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