Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

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Record number 358982
Title Allelic variation in the effector genes of the tomato pathogen Cladosporium fulvum reveals different modes of adaptive evolution
Author(s) Stergiopoulos, I.; Kock, M.J.D. de; Lindhout, P.; Wit, P.J.G.M. de
Source Molecular Plant-Microbe Interactions 20 (2007)10. - ISSN 0894-0282 - p. 1271 - 1283.
Department(s) Laboratory of Phytopathology
Plant Breeding
Publication type Refereed Article in a scientific journal
Publication year 2007
Keyword(s) amino-acid sites - cf-2-dependent disease resistance - avirulence gene - plant-pathogen - cf-4-mediated resistance - extracellular proteins - positive selection - virulence factor - fungal pathogen - downy mildew
Abstract The allelic variation in four avirulence (Avr) and four extracellular protein (Ecp)¿encoding genes of the tomato pathogen Cladosporium fulvum was analyzed for a worldwide collection of strains. The majority of polymorphisms observed in the Avr genes are deletions, point mutations, or insertions of transposon-like elements that are associated with transitions from avirulence to virulence, indicating adaptive evolution of the Avr genes to the cognate C. fulvum resistance genes that are deployed in commercial tomato lines. Large differences in types of polymorphisms between the Avr genes were observed, especially between Avr2 (indels) and Avr4 (amino-acid substitutions), indicating that selection pressure favors different types of adaptation. In contrast, only a limited number of polymorphisms were observed in the Ecp genes, which mostly involved synonymous modifications. A haplotype network based on the polymorphisms observed in the effector genes revealed a complex pattern of evolution marked by reticulations that suggests the occurrence of genetic recombination in this presumed asexual fungus. This, as well as the identification of strains with identical polymorphisms in Avr and Ecp genes but with opposite mating-type genes, suggests that development of complex races can be the combined result of positive selection and genetic recombination.
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