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Virulence Phenotypes and Molecular Genotypes in Collections of Puccinia triticina from Italy

Permanent URL:
http://handle.nal.usda.gov/10113/42897
Abstract:
Twenty-four isolates of Puccinia triticina from Italy were characterized for virulence to seedlings of 22 common wheat Thatcher isolines, each with a different leaf rust resistance gene, and for molecular genotypes at 15 simple sequence repeat (SSR) loci. The isolates were compared to a set of 13 previously characterized P. triticina isolates from either durum or common wheat. Clustering based on virulence phenotypes and SSR genotypes grouped the Italian P. triticina isolates into three groups. In the first group, the isolates had virulence phenotypes and SSR genotypes that were similar to the isolates collected from durum wheat. Isolates in the second group were unique because they had virulence similar to the isolates from common wheat but were distinct for SSR genotypes compared to the isolates from durum wheat and from common wheat. Isolates in the third group had virulence phenotypes and SSR genotypes closely related to the isolates from common wheat. The isolates were grouped based on the known or assumed host of origin, virulence phenotype, and SSR genotypes. Measures of F(ST) and R(ST) for SSR genotypes, and Φ(ST) for virulence phenotype were significant, which indicated differentiation among the three groups of isolates. Virulence phenotypes and molecular genotypes were highly correlated with r = 0.74.
Author(s):
Mantovani, Paola , Maccaferri, Marco , Tuberosa, Roberto , Kolmer, James
Subject(s):
Triticum aestivum , wheat , grain crops , Puccinia recondita , plant pathogenic fungi , rust diseases , disease resistance , genetic resistance , virulence , phenotypic variation , strain differences , microbial genetics , microsatellite repeats , genetic markers , genetic variation , host plants , Triticum turgidum subsp. durum , durum wheat , genetic correlation , Italy
Format:
p. 420-424.
Note:
Includes references
Source:
Plant disease: an international journal of applied plant pathology 2010 Apr., v. 94, no. 4
Language:
English
Year:
2010
Collection:
Journal Articles, USDA Authors, Peer-Reviewed
File:
Download [PDF File]
Rights:
Works produced by employees of the U.S. Government as part of their official duties are not copyrighted within the U.S. The content of this document is not copyrighted.