Interspecific Crosses Between Closely Related HeterothallicPhytophthoraSpecies

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Abstract
Five crosses between closely related heterothallic Phytophthora species produced oospores, a low percentage (1-5%) of which germinated. Colony morphology, optimum and maximum growth temperatures, growth rate, pathogenicity and composition in soluble proteins among the progeny were studied. Among these single oospore isolates, only one, from a cross between P. capsici and P. palmivora apparently was a product of interspecific hybridization. All other crosses resulted in phenotypically heterogeneous progeny that exhibited recombination for some morphological, physiological and pathogenic characters; their protein patterns were of a single parental type. The progeny probably resulted from the self-fertilization of diploid heterozygous parental strains rather than from hybridization.

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