Determination of Seedling Reactions of Some Barley Cultivars, Lines, and Wild Barley (Hordeum spontaneum) Genotypes to Cochliobolus Leaf Spot Disease

Cochliobolusleaf spot disease, also seen in barley, is an important disease caused by the fungus, Cochliobolus sativus. In this study, under greenhouse conditions, seedling stagereactions of 36 barley cultivars, 35 advancedlines, and 21 wild barley (Hordeum spontaneum) genotypes obtained from Elazığ province of Türkiye and Güzelyurt district of the Turkish Republic of Northern Cyprus against a virulent isolate of Cochliobolus sativus has been determined. Among barley cultivars and genotypes, six genotypes showed a low reaction, 29 genotypes showed moderate reactions and 36 genotypes showed a high reaction. Of the wild barley genotypes, two, 8, and 11 genotypes showed low, moderate, and high reactions respectively. Barley cultivars Harman and Pınar showed low reaction responses, cultivars Akar, Bolayır, Bozlak, Burgaz, Çumra 2001, Hasat, Misket, Orza 96, Sabribey, Sinanbey, Yaprak, and Yesevi 93 exhibited intermediate reaction responses and cultivars Anka-06, Asil, Avcı 2002, Aydanhanım, Ayrancı, Başgül, Burakbey, Bülbül 89, Cacabey, Cirit, Çetin 2000, Hazar, İnce 04, Keykubat, Larende, Özdemir 05, Sayım 40, Tarm 92, Tosunpaşa, Yalın, Yüksel, and Zeynelağa showed high reaction responses. Barley cultivars exhibiting low reaction types can be used by farmers in the field, while barley lines and wild barley genotypes showing low reactions can be used in breeding studies.