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Characterization of Fusarium oxysporum f.sp. phaseoli by pathogenic races, VCGs, RFLPs, and RAPD

Characterization of Fusarium oxysporum f.sp. phaseoli by pathogenic races, VCGs, RFLPs, and RAPD

Phytopathology 86(9): 966-973

Isolates of Fusarium oxysporum were obtained from the vascular tissue of Phaseolus spp. and characterized by pathogenicity, vegetative compatibility, restriction fragment length polymorphisms (RFLPs), and random amplified polymorphic DNA (RAPD) analyses. Eleven isolates were F. oxysporum f. sp. phaseoli and comprised five pathogenic races. Two races, nine vegetative compatibility groups (VCGs), and three heterokaryon self-incompatible isolates are new reports for this forma specialis. Pathogenic and nonpathogenic isolates were not found in the same VCGs and, in some cases, there was a correspondence of VCG to race and place of origin. RFLPs with five different restriction enzymes and RAPD with four different primers indicated genetic diversity in F. oxysporum f. sp. phaseoli. The banding patterns showed a correspondence to the VCGs, but not to the pathogenic races. RFLPs and RAPD markers could be used to distinguish isolates that were nonpathogenic, self-incompatible, and from obscure origins. The use of all four methods combined was effective in characterizing and providing insight into the complex relationship of F. oxysporum f. sp. phaseoli.

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