Abstract
A substantial level of xylose was detected in the pectic polysaccharides that had been extracted from carrot (Daucus carota L.) calli and purified by gel-permeation and ion-exchange chromatography. The results of the removal of neutral sugar chains and β-elimination indicated that the xylose was not included in the neutral sugar chains but was directly bound to a polygalac-turonic-acid backbone. Methylation analysis confirmed that the xylose was directly linked to galacturonic acid at position 2 or 3, as a terminal residue. The amount of xylose was positively correlated with the size of cell clusters in several lines of cultured carrot cells.
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