Pathogenicity and race characterization of Fusarium oxysporum f. sp. phaseoli isolates from Spain and Greece |
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| Authors: | F M Alves-Santos ‡ L Cordeiro-Rodrigues § J M Sayagués ¶ R Martín-Domínguez P García-Benavides M C Crespo J M Díaz-Mínguez A P Eslava |
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| Institution: | Area de Genética, Centro Hispano-Luso de Investigaciones Agrarias, Universidad de Salamanca, Avda. Campo Charro s/n, 37007 Salamanca;;Departamento de Producción Vegetal, Universidad de Salamanca, Avda. Filiberto Villalobos 119, 37007 Salamanca;and;Centro de Investigación del Toro de Lidia, Ap. oficial, Junta de Castilla y León, Salamanca, Spain |
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| Abstract: | Virulence (≡ severity of disease) and physiological specialization of nine isolates of Fusarium oxysporum f. sp. phaseoli recovered in El Barco de Avila (Castilla y León, west-central Spain) and of two isolates from Chryssoupolis (Greece) were determined. The susceptibility/resistance response showed by a differential set of common bean cultivars ( Phaseolus vulgaris ) selected at the Centro Internacional de Agricultura Tropical (CIAT) delineated the isolates into two new races: races 6 and 7. The results of pathogenicity tests did not show any significant differences in virulence among the isolates. However, the reactions of several Spanish common bean cultivars indicated the presence of two groups of isolates, highly virulent and weakly virulent, among the Spanish isolates analysed. These results indicate that isolates classified in the same race are not homogeneous with respect to virulence, and suggests that race analysis using the CIAT differential cultivars is insufficient to describe the physiological specialization of F. oxysporum f. sp. phaseoli . |
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| Keywords: | fusarium wilt pathogenicity Phaseolus vulgaris plant breeding |
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