Screening of Turkish Common Bean Varieties for Resistance Sources to Angular Leaf Spot Disease

Angular leaf spot caused by Pseudocercospora griseola is a common disease in all common bean production areas of the world. The breeding and use of resistant varieties are effective and sustainable methods of combating this pathogen. In this context, different resistance genes against the pathogen were explored, and many molecular markers associated with these genes were widely used in breeding studies. This research investigated resistance sources to angular leaf spot on 64 bean varieties widely grown in Turkey using SN02, SH13, and g2303 molecular markers. The findings revealed that the most common gene among the varieties was Phg-2, followed by Phg-ON and Phg-1 genes, respectively. Concerning different gene combinations, it was determined that 17 cultivars had 1 gene, 41 cultivars had 2 genes, and 5 cultivars (Yalova-17, Boncuk, Aslan, Helda, Akman-98) had all three resistance genes. The determined resistance genes may contribute to the breeding studies to be carried out on angular leaf spot.