Document Detail


Glucuronoarabinoxylan structure in the walls of Aechmea leaf chlorenchyma cells is related to wall strength.
MedLine Citation:
PMID:  18632122     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
In CAM-plants rising levels of malic acid in the early morning cause elevated turgor pressures in leaf chlorenchyma cells. Under specific conditions this process is lethal for sensitive plants resulting in chlorenchyma cell burst while other species can cope with these high pressures and do not show cell burst under comparable conditions. The non-cellulosic polysaccharide composition of chlorenchyma cell walls was investigated and compared in three cultivars of Aechmea with high sensitivity for chlorenchyma cell burst and three cultivars with low sensitivity. Chlorenchyma layers were cut from the leaf and the non-cellulosic carbohydrate fraction of the cell wall fraction was analyzed by gas-liquid chromatography. Glucuronoarabinoxylans (GAXs) were the major non-cellulosic polysaccharides in Aechmea. The fine structure of these GAXs was strongly related to chlorenchyma wall strength. Chlorenchyma cell walls from cultivars with low sensitivity to cell burst were characterized by an A/X ratio of ca. 0.13 while those from cultivars with high sensitivity showed an A/X ratio of ca. 0.23. Xylose chains from cultivars with high cell burst sensitivity were ca. 40% more substituted with arabinose compared to cultivars with low sensitivity for cell burst. The results indicate a relationship in vivo between glucuronoarabinoxylan fine structure and chlorenchyma cell wall strength in Aechmea. The evidence obtained supports the hypothesis that GAXs with low degrees of substitution cross-link cellulose microfibrils, while GAXs with high degrees of substitution do not. A lower degree of arabinose substitution on the xylose backbone implies stronger cell walls and the possibility of withstanding higher internal turgor pressures without cell bursting.
Authors:
Johan Ceusters; Elsje Londers; Kristof Brijs; Jan A Delcour; Maurice P De Proft
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2008-07-14
Journal Detail:
Title:  Phytochemistry     Volume:  69     ISSN:  0031-9422     ISO Abbreviation:  Phytochemistry     Publication Date:  2008 Sep 
Date Detail:
Created Date:  2008-09-15     Completed Date:  2008-11-07     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0151434     Medline TA:  Phytochemistry     Country:  United States    
Other Details:
Languages:  eng     Pagination:  2307-11     Citation Subset:  IM    
Affiliation:
Faculty of Bioscience Engineering, Department of Biosystems, Division of Crop Biotechnics, Katholieke Universiteit Leuven, Willem De Croylaan 42, B-3001 Heverlee, Belgium. johan.ceusters@biw.kuleuven.be
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MeSH Terms
Descriptor/Qualifier:
Bromeliaceae / chemistry*,  metabolism
Cell Wall / chemistry*,  metabolism
Circadian Rhythm
Glucuronides / chemistry*
Malates / metabolism
Monosaccharides / metabolism
Plant Leaves / chemistry*,  metabolism
Water
Xylans / chemistry*
Chemical
Reg. No./Substance:
0/Glucuronides; 0/Malates; 0/Monosaccharides; 0/Xylans; 6915-15-7/malic acid; 7732-18-5/Water; 9040-27-1/arabinoxylan

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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