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- Title
The genetic diversity of Icelandic populations of two barley leaf pathogens, Rhynchosporium commune and Pyrenophora teres.
- Authors
Stefansson, Tryggvi; Serenius, Marjo; Hallsson, Jon
- Abstract
Twelve species of fungi have been found growing on barley leaves in Icelandic fields. The study presented here on the population structure of two of these species, the pathogens Rhynchosporium commune and Pyrenophora teres f. teres, reveals high levels of genetic diversity, low levels of migration, and a significant differentiation from other European populations, despite the short history of continuous barley cultivation in Iceland. The gene diversity for R. commune in Iceland was 0.55 compared to a range of 0.43-0.73 for six European populations. The gene diversity for P. teres was higher in Iceland than in populations from Russia and Finland. The two mating types were found to overlap in distribution for both fungi making sexual reproduction a possibility, supported by the few clones and the gametic equilibrium within the Icelandic populations. When the high levels of diversity, low levels of migration, and the genetic differentiation observed between Icelandic and Scandinavian populations are put into context with the short history of barley cultivation in Iceland, it raises questions regarding the origin of the Icelandic fungal populations. It also underlines the importance of proper analysis of pathogens prior to starting resistance breeding projects. The findings are an addition to the ongoing analysis of the global diversity of barley fungal pathogens in general and an important input into future barley breeding projects in Iceland in particular.
- Subjects
ICELAND; BARLEY diseases &; pests; RHYNCHOSPORIUM; PYRENOPHORA teres; DODDER; MICROSATELLITE repeats
- Publication
European Journal of Plant Pathology, 2012, Vol 134, Issue 1, p167
- ISSN
0929-1873
- Publication type
Article
- DOI
10.1007/s10658-012-9974-8