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Genetic Diversity of Lettuce for Resistance to Bacterial Leaf Spot Caused by Xanthomonas campestris pv. vitians

C. T. Bull, P. H. Goldman, R. Hayes, L. V. Madden, S. T. Koike, and E. Ryder

September 2007


Lettuce plants were artificially inoculated with three isolates of Xanthomonas campestris pv. vitians in field and greenhouse evaluations for genetic variation in resistance to bacterial leaf spot. ’Little Gem’ had the least amount of disease, while Vista Verde, Pybas 251, Pacific, Clemente, Salinas 88, and Sniper were highly susceptible. There was a strong correlation between the greenhouse and the field, indicating that greenhouse assays may be used to increase the number of cultivars evaluated and to speed breeding efforts.


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