Genetics ofPhytophthora infestans: Determination of Recombination, Segregation, and Selfing by Isozyme Analysis

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Abstract
High levels of oospore germination (greater than 50%) were observed in some matings between A1 and A2 compatibility types of Phytophthora infestans. The parental isolates were predominantly of recent Mexican origin. The electrophoretic patterns at two enzyme loci, glucosephosphate isomerase and peptidase were identified in 685 single-oospore progeny from seven crosses. Progeny from parents homozygous for different alleles were heterozygous. Progeny from parents heterozygous for these alleles segregated 1:2:1 (homozygous fast:heterozygous:homozygous slow), as expected for a diploid organism. The ratio of A1:A2 compatibility type in the progeny was generally 1:1. A large number of self-fertile progeny were recorded from several crosses.