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The microtubule-associated protein AtMAP70-5 regulates secondary wall patterning in Arabidopsis wood cells
Umeå University, Faculty of Science and Technology, Department of Plant Physiology. Umeå University, Faculty of Science and Technology, Umeå Plant Science Centre (UPSC).ORCID iD: 0000-0002-6959-3284
2010 (English)In: Current Biology, ISSN 0960-9822, E-ISSN 1879-0445, Vol. 20, 744-749 p.Article in journal (Refereed) Published
Abstract [en]

Xylem tracheary elements (TEs) form hollow, sap-conducting tubes kept open by thickened ribs of secondary cell wall that provide the major structural element in wood. These ribs are enriched with cellulose and lignin, molecules that utilize more atmospheric CO(2) than any other biopolymer on Earth. The thickenings form characteristic patterns (e.g., spiral and pitted) that depend upon the bundling of underlying microtubules [1, 2]. To identify microtubule-associated proteins (MAPs) involved in patterning microtubules, we optimized an in vitro system for triggering single Arabidopsis cells to differentiate synchronously into TEs. From more than 200 microtubule-implicated proteins, AtMAP70-5 was the only MAP upregulated upon, and specific to, TE differentiation. It lines the borders of each microtubule bundle and forms C-shaped "spacers" between adjacent bundles. Manipulating levels of AtMAP70-5 and its binding partner AtMAP70-1 by overexpression or RNA interference (RNAi) silencing shifted the balance between the characteristic patterns. RNAi silencing produced stunted plants with disorganized vascular bundles. In culture, RNAi knockdown caused ribs of secondary cell wall, surrounded by microtubules, to invaginate and fall into the cytoplasm. These results suggest that AtMAP70-5 and AtMAP70-1 are essential for defining where secondary cell wall polymers are applied at the cell cortex in wood-forming cells.

Place, publisher, year, edition, pages
2010. Vol. 20, 744-749 p.
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Physiological Botany
URN: urn:nbn:se:umu:diva-37320DOI: 10.1016/j.cub.2010.02.057PubMedID: 20399097OAI: diva2:359227
Available from: 2010-10-27 Created: 2010-10-27 Last updated: 2015-04-29Bibliographically approved

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Pesquet, Edouard
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Department of Plant PhysiologyUmeå Plant Science Centre (UPSC)
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