Mattisson, H.Nybom, H.2021-06-282021-06-282005-08-12International Journal of Horticultural Science, Vol. 11 No. 3 (2005) , 59-63.1585-0404https://hdl.handle.net/2437/314337A DNA marker-based study was undertaken to identify the occurrence of major scab resistance genes in some apple cultivars and selections of importance for apple breeding. Unfortunately none of the RAPD-based markers previously reported to detect the V a , V b , V r and V x genes produced unambiguous results. By contrast, the CAPS marker MI8 produced the expected three bands in all cultivars and selections already known or suspected to have the V f gene, as well as in the Russian cultivar 'Antonovka Polotora Funtovaja' suspected to have V a resistance which however may be allelic to V f . V f -carrying selections and newly named cultivars 'Frida' and 'Fredrik' are grown successfully in Sweden without fungicides, suggesting that the V r resistance breaking scab races 6 and 7 have not yet become a problem. The SCAR marker B12 detected the V m gene in 'Prairifire', 'Rouville', clones 'OR45T132' and 'OR48T70', and selection '16-36-193'. The SSR locus 0102b10 detected one band at 118 by in 'Reka'. This is presumed to be identical to the V r gene marker previously reported.application/pdfMalus x domesticaVenturia inaequalisappleDNA markerresistancescabfolyóiratcikkOpen AccessInternational Journal of Horticultural Sciencehttps://doi.org/10.31421/IJHS/11/3/600International Journal of Horticultural Science311Int. j. hortic. sci.2676-931X