Authors
Ailton
Reis
,
Departamento Fitopatologia, Universidade Federal de Viçosa (UFV), 36570-000 Viçosa-MG, Brazil
;
Christine D.
Smart
and
William E.
Fry
,
Department of Plant Pathology, Cornell University, 334 Plant Science, Ithaca, NY 14853, USA
;
Luiz A.
Maffia
and
Eduardo S. G.
Mizubuti
,
Departamento Fitopatologia, UFV, Brazil
ABSTRACT
The population of Phytophthora infestans in Brazil was first characterized 12 years ago. In this research, isolates of P. infestans from potato (n = 184) and tomato (n = 267) collected in southern and southeastern Brazil were characterized to provide more detailed analysis of the current structure of the population. All 451 isolates were analyzed for mating type, and subsets of the isolates were analyzed for allozymes, restriction fragment length polymorphism fingerprint, mtDNA haplotypes, and metalaxyl resistance. Tomato isolates were all of A1 mating type, mtDNA Ib, and US-1 genotype or some variant within this clonal lineage. Of the potato isolates, 82% were A2 mating type, mtDNA IIa, BR-1 genotype, which is a new lineage of P. infestans. All A2 isolates were found on potato, whereas 91% of the A1 isolates were from tomato. A1 and A2 isolates were never found in the same field. The frequency of resistance to metalaxyl was higher in isolates from tomato (55%) than in isolates from potato (38%). After more than a decade of coexistence of isolates of the A1 and A2 mating types, the population was highly clonal, dominated by the BR-1 and US-1 clonal lineages.
