Requirement of Borate Cross-Linking of Cell Wall Rhamnogalacturonan II for Arabidopsis Growth
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- 26 October 2001
- journal article
- other
- Published by American Association for the Advancement of Science (AAAS) in Science
- Vol. 294 (5543) , 846-849
- https://doi.org/10.1126/science.1062319
Abstract
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.Keywords
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