Formation, production and viability of oospores of Phytophthora infestans from potato and Solanum demissum in the Toluca Valley, central Mexico

W.G. Flier, N.J. Grünwald, W.E. Fry, L.J. Turkensteen

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    31 Citations (Scopus)

    Abstract

    Aspects of the ecology of oospores of Phytophthora infestans were studied in the highlands of central Mexico. From an investigation of a random sample of strains, it was found that isolates differed in their average capability to form oospores when engaged in compatible pairings. Most crosses produced large numbers of oospores but a few yielded none and some yielded only a few oospores. The results reveal that oospore production and fecundity is dependent on both isolates and the combining ability of a specific combination of parental strains. On average, 14% of the oospores produced were viable as determined by the plasmolysis method. Viability ranged from a low 1% in one cross to a high of 29% in another cross. Oospores were found in 10-20% of naturally infected Solanum demissum leaves from two different collections, and leaflets with two lesions per leaflet produced more oospores than did leaflets with 3-5 lesions per leaflet. There was no consistent trend for preferential mating between isolates from the same location or host.
    Original languageEnglish
    Pages (from-to)998-1006
    JournalMycological Research
    Volume105
    Issue number8
    DOIs
    Publication statusPublished - 2001

    Keywords

    • sympatric speciation
    • inheritance
    • genetics
    • populations
    • segregation
    • resistance
    • virulence

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