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Postulation of resistance genes to wheat stem rust in winter wheat genotypes from Szeged



Postulation of resistance genes to wheat stem rust in winter wheat genotypes from Szeged



Acta Phytopathologica et Entomologica Hungarica 33(1-2): 37-42



The seedling reaction of thirteen winter wheat genotypes from Szeged was assessed to 12 stem rust (Puccinia graminis f. sp. tritici) pathotypes with known virulence factors. The postulated genes were Sr5, Sr31 and Sr36 in eight cultivars. Four cultivars gave low infection types to all isolates. The results of seedling tests and source of stem rust resistance (genetic background) of these cultivars suggested that the resistance gene Sr31 is present in GK Csornoc and GK Zombor and the resistance gene Sr36 in GK Kincso and GK Gobe. Cultivars GK Istvan, GK Bama, Yubileynaya 50 and GK Delibib were postulated to have resistance gene Sr5. On the basis of the pedigree of cultivar GK Istvan it could have the gene Sr31 too, however the results of seedling tests did not confirm that supposition. This cultivar was susceptible to all pathotypes of stem rust races which were virulent to Sr5.

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