Abstract

Two pairs of susceptible and highly resistant lines of Gossypium hirsutum were compared for their influence on Xanthomonas campestris pv. malvacearum extracellular polysaccharide (EPS) production during the early stages of infection. Quantities of EPS in intercellular washing fluid from inoculated cotton cotyledons were measured and related to the bacterial population densities in those same cotyledons. The presence of pyruvylated mannose in EPS from X. c. malvacearum, as in xanthan gum from X. c. campestris, allowed accurate quantitation of EPS without interference from polysaccharides of plant origin []

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