GENETIC DIVERSITY IN XANTHOMONAS CAMPESTRIS PV. PHASEOLI AND X. C. PV. PHASEOLI VAR. FUSCANS AND THE INTERACTION WITH RESISTANT COMMON BEAN GENOTYPES

摘要

Xanthomonas campestris pv. phaseoli (Xcp) and X. c. pv. phaseoli var. fuscans (Xcpf) cause common bacterial blight (CBB), a seed borne disease of common bean (Phaseolus vulgaris L.). Genetic diversity of the pathogen has previously been reported between and within strains of Xcp and Xcpf. Detailing the population structure of the pathogen in a localized growing region can identify the most prevalent strains and their relative pathogenicity, allowing for the identification of appropriate strains to beused in the direct selection for CBB resistance in a breeding program. Thus, the objectives of this study were to: 1) determine the genetic diversity of Xcp and Xcpf within a defined geographic region growing a single predominant type of bean (large-seeded dark red kidney beans of the Andean gene pool) and 2) determine the pathogenic variation of Xcp and Xcpf strains on a diverse set of common bean germplasm reported to possess CBB resistance.