Requirement of borate cross-linking of cell wall rhamnogalacturonan II for Arabidopsis growth.

Autor: O'Neill MA; Complex Carbohydrate Research Center and Department of Biochemistry and Molecular Biology, University of Georgia, 220 Riverbend Road, Athens, GA 30602-4712, USA. mao@ccrc.uga.edu, Eberhard S, Albersheim P, Darvill AG
Jazyk: angličtina
Zdroj: Science (New York, N.Y.) [Science] 2001 Oct 26; Vol. 294 (5543), pp. 846-9.
DOI: 10.1126/science.1062319
Abstrakt: Turgor-driven plant cell growth depends on wall structure. Two allelic l-fucose-deficient Arabidopsis thaliana mutants (mur1-1 and 1-2) are dwarfed and their rosette leaves do not grow normally. mur1 leaf cell walls contain normal amounts of the cell wall pectic polysaccharide rhamnogalacturonan II (RG-II), but only half exists as a borate cross-linked dimer. The altered structure of mur1 RG-II reduces the rate of formation and stability of this cross-link. Exogenous aqueous borate rescues the defect. The reduced cross-linking of RG-II in dwarf mur1 plants indicates that plant growth depends on wall pectic polysaccharide organization.
Databáze: MEDLINE
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