Comparative study of genetic diversity and pathogenicity among populations of Verticillium dahliae from cotton in Spain and Israel
2001
Korolev, N. | Perez-Artes, E. | Bejarano-Alcazar, J. | Rodriguez-Jurado, D. | Katan, J. | Katan, T. | Jimenez-Diaz, R.M.
Genetic diversity and phenotypic diversity in Verticillium dahliae populations o n cotton were studied among 62 isolates from Spain and 49 isolates from Israel, using vegetative compatibility grouping (VCG), virulence and molecular assays. I n Spain, defoliating V. dahliae isolates (D pathotype) belong to VCG1, and non-d efoliating isolates (ND) belong to VCG2A (often associated with tomato) and VCG4 B (often associated with potato). The D pathotype was not identified in Israel. The ND pathotype in Israel is comprised of VCG2B and VCG4B. Isolates in VCG2B an d VCG4B ranged in virulence from weakly virulent to highly virulent. The highly virulent isolates induced either partial defoliation or no defoliation. Virulenc e characteristics varied with inoculation method and cotton cultivar. Highly vir ulent isolates from Israel were as virulent as D isolates from Spain under condi tions conducive to severe disease. The D pathotype is pathologically and genetic ally homogeneous, whereas the ND pathotype is heterogeneous with respect to viru lence, VCG, and molecular markers based on single-primer RAPD and on PCR primer pairs.
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