Virulence of Icelandic Pyrenophora teres f. teres populations and resistance of Icelandic spring barley lines

Abstract The causal agent of the barley net blotch disease, Pyrenophora teres , is known for its high level diversity due to sexual reproduction. Different pathotypes, defined by a virulence combination, even within same fields are frequently found and between locations can vary considerably. Evaluation patterns pathogen population essential breeding resistant cultivars suitable specific locations. To identify in Icelandic f. (Ptt) isolates, twenty single spore isolates Ptt were collected from seven Iceland analysed with AFLP markers. Principle Coordinate Analysis (PCoA) revealed clustering away reference Austria, Finland, Sweden, Switzerland, UK, USA. Hierarchical grouped into three distinct groups. Furthermore, these was tested on 16 differential lines variation their virulence. Twenty-one commonly used showed susceptibility towards inoculation isolates.