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ARS Home » Pacific West Area » Corvallis, Oregon » Horticultural Crops Research Unit » Research » Publications at this Location » Publication #189668
Title: HEIRARCHICAL ANALYSIS OF DIVERSITY, SELFING AND GENETIC DIFFERENTIATION IN POPULATIONS OF THE OOMYCETE APHANOMYECES EUTEICHES

Author
item Grunwald, Niklaus - Nik
item HOHEISEL, GWEN-ALYN - WASHINGTON STATE UNIV

Submitted to: Phytopathology
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 5/25/2006
Publication Date: 9/1/2006
Citation: Grunwald, N.J., Hoheisel, G. 2006. Heirarchical analysis of diversity, selfing and genetic differentiation in populations of the oomycete aphanomyeces euteiches. Phytopathology. 96(10):1134-1141.

Interpretive Summary: Aphanomyces euteiches is an important root rot pathogen of pea. Our objectives were to assess the degree of variation for genotype and pathogenicity in a population of Aphanomyces euteiches within two growers' fields with a history of Aphanomyces root rot. Genotypic diversity was determined using molecular fingerprinting techniques while phenotypic diversity was assessed in controlled greenhouse studies. Populations of A. euteiches recovered from two fields in northeast OR and western WA are genetically diverse within a field, yet well differentiated when comparing both fields. At the same time, both populations are well adapted to their pea hosts and are very aggressive to the five pea lines included in this study.

Technical Abstract: Aphanomyces euteiches is an important root rot pathogen of pea. Our objectives were to assess the degree of variation for genotype and pathogenicity in a population of Aphanomyces euteiches within two growers' fields with a history of Aphanomyces root rot. We evaluated two hypotheses: (1) populations of A. euteiches are diverse genotypically and phenotypically within single fields, and (2) that populations of A. euteiches from different fields are well differentiated. Genotypic diversity was determined using amplified fragment length polymorphism fingerprinting while phenotypic diversity was based on greenhouse studies to determine disease severity readings on 5 pea clones differing in resistance to A. euteiches. Populations of A. euteiches recovered from two fields in northeast OR and western WA are genetically diverse within a field, yet well differentiated when comparing both fields. At the same time, both populations are well adapted to their pea hosts and are very aggressive to the five pea lines included in this study.