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Cell Wall Metabolism in Ripening Fruit : V. Analysis of Cell Wall Synthesis in Ripening Tomato Pericarp Tissue Using a D-[U-C]Glucose Tracer and Gas Chromatography-Mass Spectrometry

Overview
Journal Plant Physiol
Specialty Physiology
Date 1991 Dec 1
PMID 16668571
Citations 19
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Abstract

A gas chromatographic-mass spectrometric technique utilizing d-[U-(13)C]glucose as a density label tracer was used to follow the synthesis of cell wall polysaccharides in pericarp discs that were excised from mature green tomato fruit (Lycopersicon esculentum) and allowed to ripen in culture. The biosynthetic capacity of discs from four different maturity stages was examined. Label was differentially incorporated into wall polysaccharides as the discs matured, indicating a change in the nature of wall polymers being synthesized. These differential rates of incorporation are consistent with descriptions of ripening-related cell wall compositional changes previously reported by other authors. Specific changes in wall biosynthesis noted include increased incorporation of xylosyl and mannosyl residues into hemicellulosic cell wall fractions as the discs mature and decreased incorporation of galactosyl residues into chelator-soluble pectins.

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