STRUCTURAL RELATIONSHIPS OF EXTRACELLULAR POLYSACCHARIDES FROM PHYTOPATHOGENIC XANTHOMONAS SPP.: PART II. X. HYACINTHI, X. TRANSLUCENS, AND X. MACULOFOLIIGARDENIAE

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Abstract
The extracellular polysaccharide formed from Xanthomonas hyacinthi is shown to be a branched polymer containing glucuronic acid, mannose, and glucose. Acid and enzymic hydrolysis show the presence of β-D-Glp 1 → 4 D-Man and the 4-unit sequence β-D-GlpA1 → 2 D-Manp 1 → 3 β-D-Glp 1 → 4 D-Gl. Examination by the methylation technique showed the presence of a considerable proportion of 2-linked mannopyranose units. The spectrum of methyl glycosides formed from this polysaccharide and those from Xanthomonas maculofoliigardeniae and Xanthomonas translucens are similar, and in terms of sugar linkages differentiate them from that of Xanthomonas stewartii, which contains glucuronic acid, glucose, and galactose.