Rau, Domenico and Attene, Giovanna and Ferradini, Nicoletta and Nanni, Laura and Brown, Anthony H. D. and Balmas, Virgilio and Saba, Eva and Papa, Roberto (2004) Comparative analysis of the molecular diversity in the Pyrenophora teres - Hordeum vulgare plant-pathosystem. In: barley, Phyrenophora teres, co-evolution, diversity, molecular markers, 15/18 September, 2004, Lecce, Italy. [S.l.], [S.n.]. ISBN 88-900622-5-8. Conference or Workshop Item.
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Most analyses of the plant-pathogen co-adaptation process have used either of two approaches. The first is to compare the performance of the pathogen on sympatric and allopatric host populations. The second consists in comparing the population structure of both plant and pathogen. When the organization of genetic variation does not match between the two protagonists, stochastic forces rather than co-adaptation are responsible for the maintenance of resistance and virulence. In contrast, it has commonly argued that a parallelism in the population structure for both plant and pathogen is an indicator of co-adaptation. We compare the population genetic structure of six landrace populations of Hordeum vulgare L. as revealed by SSR markers with that of eleven populations (6 of the net form and 5 of the spot form of the pathogen) of Pyrenophora teres Sacc. (Shoem.) analysed with AFLPs. All the barley genotypes and fungal isolates were collected from the same fields but in two different and independent collections. The evolutionary forces likely to be responsible of the observed pattern of genetic variation are investigated.
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