Region-Wide Analysis of Genetic Diversity in Verticillium dahliae Populations Infecting Olive in Southern Spain and Agricultural Factors Influencing the Distribution and Prevalence of Vegetative Compatibility Groups and Pathotypes


Publicación: Phytopathology Vol. 101, No. 3, 2011

Año de publicación: 2011

Tamaño: 372 Kb

Descargas: 282

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Severity of Verticillium wilt in olive trees in Andalusia, southern Spain is associated with the spread of a highly virulent, defoliating (D) Verticillium dahliae pathotype of vegetative compatibility group 1A (VCG1A) but the extent of this spread and the diversity of the pathogen population have never been documented. VCG typing of 637 V. dahliae isolates from 433 trees in 65 orchards from five olive-growing provinces in Andalusia indicated that 78.1% were of VCG1A, 19.8% of VCG2A, 0.6% of VCG2B, 1.4% of VCG4B, and one isolate was heterokaryon selfincompatible. A single VCG prevailed among isolates within most orchards but two and three VCGs were identified in 12 and 3 orchards, respectively, with VCG1A+VCG2A occurring in 10 orchards. VCG1A was the predominant VCG in the three most important olive-growing provinces, and was almost as prevalent as VCG2A in another one. Molecular pathotyping of the 637 isolates using specific polymerase chain reaction assays indicated that VCG1A isolat

Tags: olivo , andalucía

Fuente: Phytopathology

Autores: Rafael M. Jiménez-Díaz, Concepción Olivares-García, Blanca B. Landa, María del Mar Jiménez-Gasco, and Juan A. Navas-Cortés

Publicación que recoge los numerosos aislamientos de patotipos de Verticillium dahliae realizados en olivares de Andalucía con la intención de valorar su peligrosidad, variabilidad y distribución.