Abstract

GILCHRIST RAMELLI, Elizabeth; JARAMILLO VILLEGAS, Sonia; AFANADOR KAFURI, Lucia  and  ARANGO ISAZA, Rafael Eduardo. CHARACTERIZATION OF Phytophthora infestans POPULATIONS IN ANTIOQUIA, COLOMBIA. Rev. Fac. Nac. Agron. Medellín [online]. 2009, vol.62, n.2, pp.5031-5037. ISSN 0304-2847.

From the Phytophthora infestans collection of the Universidad Nacional de Colombia, the isolates collected in different locations in Antioquia, Colombia between 1994 and 2000 were evaluated. These isolates were obtained from late blight lessons in different hosts. In 2000, these isolates were characterized by mating type, mitochondrial haplotype and virulence races. All isolates were of the A1 mating type and two mitochondrial haplotypes were identified: IIa, present in isolates from all the hosts tested, and Ib present only in isolates from tomato and water cucumber (Solanum muricatum). The Antioquia population of P. infestans showed a large complexity of virulence factors (10 out 11), especially those isolates collected from potato, while the tomato population was less complex. The A1 mating type and the mitochondrial haplotype IIa has been associated with the EC1 population that possibly is replacing the US1 population.

Keywords : Late blight; clonal lineage; South America; haplotypes; mating type.

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