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Phylogeographical analyses reveal global migration patterns of the barley scald pathogen Rhynchosporium secalis

Authors

  • PASCAL L. ZAFFARANO,

    1. Forest Pathology and Dendrology, Institute of Integrative Biology, ETH-Zurich, CHN, CH-8092 Zürich, Switzerland
    2. Plant Pathology, Institute of Integrative Biology, ETH-Zurich, LFW, Universitätsstr. 2, 8092,CH-8092 Zürich, Switzerland
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  • BRUCE A. MCDONALD,

    1. Plant Pathology, Institute of Integrative Biology, ETH-Zurich, LFW, Universitätsstr. 2, 8092,CH-8092 Zürich, Switzerland
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  • CELESTE C. LINDE

    1. School of Botany and Zoology, Building 116, Daley Road, Australian National University, Canberra ACT 0200, Australia
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Pascal L. Zaffarano, Switzerland. Fax: +41 44 632 15 72; E-mail: pascal.zaffarano@env.ethz.ch

Abstract

A phylogeographical analysis of the scald pathogen Rhynchosporium secalis was conducted using nuclear DNA sequences from two neutral restriction fragment length polymorphism loci and the mating-type idiomorphs. Approximately 500 isolates sampled from more than 60 field populations from five continents were analysed to infer migration patterns and the demographic history of the fungus. Migration rates among continents were generally low, consistent with earlier reports of significant population subdivision among continents. Northern Europe was mainly a source population for global migration. We hypothesize that the pathogen only recently moved out of its centre of origin, resulting in founder populations that are reproductively isolated due to the contemporary absence of long-distance gene flow.

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