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ARS Home » Pacific West Area » Corvallis, Oregon » Horticultural Crops Disease and Pest Management Research Unit » Research » Publications at this Location » Publication #342757
Research Project: Integrated Disease Management of Exotic and Emerging Plant Diseases of Horticultural Crops

Location: Horticultural Crops Disease and Pest Management Research Unit

Title: Phytophthora urerae sp. nov., a new clade 1c relative of the Irish famine pathogen Phytophthora infestans from South America

Author
item Grunwald, Niklaus - Nik
item FORBES, GREGORY - International Potato Center
item PEREZ-BARRERA, WILLMER - International Potato Center
item STEWART, JANE - University Of Georgia
item FIELAND, VALERIE - Oregon State University
item Larsen, Meredith

Submitted to: Phytopathology
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 11/9/2018
Publication Date: 11/30/2018
Citation: Grunwald, N.J., Forbes, G.A., Perez-Barrera, W., Stewart, J.E., Fieland, V.J., Larsen, M.M. 2018. Phytophthora urerae sp. nov., a new clade 1c relative of the Irish famine pathogen Phytophthora infestans from South America. Phytopathology. 68(3):557-565. https://doi.org/10.1111/ppa.12968.
DOI: https://doi.org/10.1111/ppa.12968

Interpretive Summary: Phytophthora is a genus of agriculturally important plant pathogens. An unknown Phytophthora species was discovered in the Central Peruvian Andes on blighted foliage of a native South American nettle. This new species, named Phytophthora urerae sp. is herewith formally described based on extensive morphological analysis and genetic analysis. P. urerae sp. nov. is a close relative of the Irish Famine pathogen, Phytophthora infestans. Findings of new species in South America may provide novel insights into the origin and evolutionary history of Phytophthora species.

Technical Abstract: An unknown Phytophthora species was discovered in the Central Peruvian Andes on blighted foliage of the native South American plant species Urera lacineata. Urera is a genus of native flowering shrubs in the nettle family Urticaceae. This new taxon Phytophthora urerae sp. nov. is herewith formally described based on extensive morphological analysis, phylogenetic analysis of nuclear and mitochondrial loci, and ALFP analysis. P. urerae sp. nov. is a close relative of the Irish Famine pathogen, Phytophthora infestans, and only the second clade 1c taxon described from South America to date. In contrast to the first clade 1c taxon P. andina first described in South America as a hybrid, P. urerae does not appear to be a hybrid based on cloning and sequencing nuclear loci. Findings of new species in South America may provide novel insights into the origin and evolutionary history of clade 1c Phytophthora species.