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The structure of Xanthomonas campestris pv. vitians O-specific polysaccharide of the lipopolysaccharide fraction, extracted from the aqueous phase, was defined, on the basis of chemical and spectroscopical methods, as constituted by the following repeating unit:[→3)-α-l-Rhap-(1→]n3)-β-l-Rhap-(1→where n is more frequently equal to 2, but it also assumes values equal to 1 and to 3.
A novel O-polysaccharide consisting of d-Xylp and l-Rhap in the molar ratio of 1:2.5 was identified as the major component in the lipopolysaccharide fraction of Xanthomonas campestris strain 642, which is responsible for a new bacterial disease of the strawberry plant. Its structure was mainly determined using chemical analysis, Smith degradation and 1D and 2D NMR spectroscopy experiments as:
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