Cellulose Synthesis and Cell Expansion Are Regulated by Different Mechanisms in Growing Arabidopsis Hypocotyls.

Autor:	Ivakov A; School of Biosciences, University of Melbourne, Parkville, VIC 3010, Melbourne, Australia alexander.ivakov@anu.edu.au.; Max-Planck Institute of Molecular Plant Physiology, 14476 Potsdam, Germany., Flis A; Max-Planck Institute of Molecular Plant Physiology, 14476 Potsdam, Germany., Apelt F; Max-Planck Institute of Molecular Plant Physiology, 14476 Potsdam, Germany., Fünfgeld M; Max-Planck Institute of Molecular Plant Physiology, 14476 Potsdam, Germany., Scherer U; Max-Planck Institute of Molecular Plant Physiology, 14476 Potsdam, Germany., Stitt M; Max-Planck Institute of Molecular Plant Physiology, 14476 Potsdam, Germany., Kragler F; Max-Planck Institute of Molecular Plant Physiology, 14476 Potsdam, Germany., Vissenberg K; Biology Department, Integrated Molecular Plant Physiology Research, University of Antwerp, 2020 Antwerpen, Belgium.; UASC-TEI, Plant Biochemistry and Biotechnology Lab, Department of Agriculture, School of Agriculture, Food, and Nutrition, Stavromenos, 71 004 Heraklion, Crete, Greece., Persson S; School of Biosciences, University of Melbourne, Parkville, VIC 3010, Melbourne, Australia.; Max-Planck Institute of Molecular Plant Physiology, 14476 Potsdam, Germany., Suslov D; Biology Department, Integrated Molecular Plant Physiology Research, University of Antwerp, 2020 Antwerpen, Belgium.; Saint Petersburg State University, Faculty of Biology, Department of Plant Physiology and Biochemistry, 199034 Saint Petersburg, Russia.
Jazyk:	angličtina
Zdroj:	The Plant cell [Plant Cell] 2017 Jun; Vol. 29 (6), pp. 1305-1315. Date of Electronic Publication: 2017 May 26.
DOI:	10.1105/tpc.16.00782
Abstrakt:	Plant growth is sustained by two complementary processes: biomass biosynthesis and cell expansion. The cell wall is crucial to both as it forms the majority of biomass, while its extensibility limits cell expansion. Cellulose is a major component of the cell wall and cellulose synthesis is pivotal to plant cell growth, and its regulation is poorly understood. Using periodic diurnal variation in Arabidopsis thaliana hypocotyl growth, we found that cellulose synthesis and cell expansion can be uncoupled and are regulated by different mechanisms. We grew Arabidopsis plants in very short photoperiods and used a combination of extended nights, continuous light, sucrose feeding experiments, and photosynthesis inhibition to tease apart the influences of light, metabolic, and circadian clock signaling on rates of cellulose biosynthesis and cell wall biomechanics. We demonstrate that cell expansion is regulated by protein-mediated changes in cell wall extensibility driven by the circadian clock. By contrast, the biosynthesis of cellulose is controlled through intracellular trafficking of cellulose synthase enzyme complexes regulated exclusively by metabolic signaling related to the carbon status of the plant and independently of the circadian clock or light signaling. (© 2017 American Society of Plant Biologists. All rights reserved.)
Databáze:	MEDLINE
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