Chemical and biological properties of extracellular polysaccharides produced by virulent and weakly virulent strains of Xanthomonas campestris pv. oryzae (Philippines)
1986
Vidhyasekaran, P. | Alvendia, M.E. | Mew, T.W.
Large colony types of Xanthomonas campestris pv. oryzae were more virulent than the small colony types. Both virulent and weakly virulent strains produced abundant extra-cellular polysaccharides (EPS) in cultures. The EPS of all strains contained glucose, mannose, glucuronic acid, acetic acid and pyruvic acid. Only pyruvic acid content of the EPS was correlated with the degree of virulence of the strains. EPS of weakly virulent strains contained glucose, mannose, glucuronic acid, acetic acid and pyruvic acid than the virulent ones. No significant differences on wilting of rice seedlings were observed on different concentrations of EPS. The EPS of all the strains induced plugging of vascular tissues, reduced water uptake, increased water potential, reduced transpiration rate and increased diffusive resistance of rice seedlings.
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