Glycosyl-linkage composition of tomato fruit cell wall hemicellulosic fractions during ripening |
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Authors: | Cindy B S Tong Kenneth C Gross |
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Institution: | USDA/ARS. Horticultural Crops Quality Lab., Beltsville, MD 20705, USA. |
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Abstract: | Hemicelluloses were extracted from isolated tomato ( Lycopersicon esculentum Mill. cv. Rutgers) pericarp cell wall material at 3 different stages of ripeness with 4 M and 8 M KOH. Little change in molecular weight or composition of 4 M KOH-extracted material was observed during ripening. However, the composition of 8 M KOH-extracted material changed, and a relative increase in polymers of < 40 kDa was observed during ripening. Changes in glycosyl linkage composition of the 8 M KOH hemicellulosic material were detected, including increases in 4-linked mannosyl, 4,6-linked mannosyl, and 4-linked glucosyl, and decreases in 5-linked arabinosyl residues in polymers of < 40 kDa, and decreases in terminal glocosyl residues in polymers of > 40 kDa. These data may indicate that de novo hemicellulose synthesis occurs throughout tomato fruit ripening, even at the red ripe stage. |
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Keywords: | Carbohydrates fruit softening linkage analysis Lycopersicon esculentum tomato |
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