Effect of Host on Multiplication and Distribution of Bean Common Blight Bacteria

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Abstract
Populations of rifampin-resistant Xanthomonas phaseoli (= X. campestris) (Xp) were determined in and on leaves and pods of resistant (tepary bean [Phaseolus acutifolius]), moderately resistant (breeding line MSU-51319 and Great Northern-type cultivar Valley [both P. vulgaris]) and susceptible bean hosts (cultivars Seafarer and Tuscola [both P. vulgaris]) by using a rifampin-containing medium. While bacterial multiplication patterns were similar for leaves and pods of moderately resistant and susceptible cultivars, maximum bacterial populations were generally lower in the former, particularly during the reproductive stage of plant development. High Xp populations were detected in and on uninoculated, symptom-free leaves of both susceptible and moderately resistant hosts, but not in or on those of resistant genotypes. Systemic colonization of plants by Xp throughout the growing season was greatest in the susceptible genotypes, intermediate in the moderately resistant genotypes, and absent in the resistant genotype.