Changes to the galactose/mannose ratio in galactomannans during coffee bean ( Coffea arabica L.) development: implications for in vivo modification of galactomannan synthesis

Planta
R J RedgwellMonica Fischer

Abstract

Endosperm was isolated from Arabica Caturra coffee beans 11, 15, 21, 26, 31 and 37 weeks after flowering, and the chemical composition and relative solubility of its component polysaccharides determined at each growth stage. Chemical analysis of the total mannan content of the cell wall material was done after solubilisation of galactomannans by alkaline extraction of the cell wall material followed by enzymatic digestion of the alkali-insoluble residue with a mixture of endo-mannanse and endo-glucanase. Eleven weeks after flowering, galactomannans accounted for approximately 10% of the polysaccharides but were highly substituted, with galactose/mannose ratios between 1:2 and 1:7. As the bean matured, galactomannan became the predominant polysaccharide, until 31 weeks after flowering it accounted for approximately 50% of the polysaccharides. However, it was less substituted, possessing galactose/mannose ratios between 1:7 and 1:40. Early in bean growth, up to 50% of the cell wall polysaccharides were extractable but as the galactomannan content of the bean increased there was a reduction in the extractability of all polysaccharides. The decrease in the galactose/mannose ratio of the galactomannans commenced between 21 and 26 we...Continue Reading

References

Aug 1, 1973·Analytical Biochemistry·N Blumenkrantz, G Asboe-Hansen
Feb 24, 2001·Carbohydrate Research·M FischerR J Redgwell
Feb 15, 2002·Carbohydrate Research·Robert J RedgwellLaurent B Fay

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Citations

Aug 1, 2008·Plant Physiology·Radnaa NaranNicholas C Carpita
Feb 12, 2009·The New Phytologist·Thierry JoëtStéphane Dussert
Feb 26, 2013·Applied Biochemistry and Biotechnology·T JoosteJ F Görgens
Nov 10, 2013·Journal of Experimental Botany·Thierry JoëtStéphane Dussert
Oct 30, 2016·Critical Reviews in Food Science and Nutrition·Deborah M WatersAlice V Moroni
Nov 26, 2009·Journal of Agricultural and Food Chemistry·Rafael Carlos Eloy DiasMarta De Toledo Benassi
Aug 17, 2006·Journal of Agricultural and Food Chemistry·Naoya KasaiGou Maeda

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