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Determination of pathogenic variability of Didymella rabiei, the agent of ascochyta blight of chickpea in Turkey

Pathogenic characterization of 64 Didymella rabiei isolates obtained from 5 different regions in Turkey was determined with a set of 7 different chickpea cultivars (ILC 1929, F8, ICC 1903, ILC 249, ILC 482, ILC 3279, and ICC 3996). | Research Article Turk J Agric For 33 (2009) 585-591 © TÜBİTAK doi:10.3906/tar-0901-34 Determination of pathogenic variability of Didymella rabiei, the agent of ascochyta blight of chickpea in Turkey Muharrem TÜRKKAN1, Fatma Sara DOLAR2 1Department of Plant Protection, Faculty of Agriculture, University of Ordu, 52200 Ordu - TURKEY 2Department of Plant Protection, Faculty of Agriculture, University of Ankara, 06110 Ankara - TURKEY Received: 23.01.2009 Abstract: Pathogenic characterization of 64 Didymella rabiei isolates obtained from 5 different regions in Turkey was determined with a set of 7 different chickpea cultivars (ILC 1929, F8, ICC 1903, ILC 249, ILC 482, ILC 3279, and ICC 3996). All the isolates were classified into both 3 pathotypes and 6 physiological races. Of the isolates used in this study, it was determined that 38 (59.4%) belonged to pathotype I, 3 (4.7%) to pathotype II, and 23 (35.9%) to pathotype III. Pathotypes I and III were determined in 5 regions of Turkey including the Mediterranean, Aegean, Southeastern Anatolia, Central Anatolia, and Black Sea regions, but pathotype II was not found in the Mediterranean and Black Sea regions. All 6 races of the D. rabiei were determined in Turkey. Race 1, 2, and 3 were established in pathotype I, while race 4 was represented in both pathotypes I and II. Pathotype III included the race 5 and 6, which were aggressive isolates. Key words: Chickpea, Ascochyta rabiei, pathotype, race Nohut yanıklık etmeni Didymella rabiei’nin Türkiye’deki patojenik değişkenliğinin belirlenmesi Özet: Türkiye’nin beş farklı bölgesinden elde edilen 64 Didymella rabiei izolatının patojenik karakterizasyonu 7 farklı nohut çeşidinden (ILC 1929, F8, ICC 1903, ILC 249, ILC 482, ILC 3279 ve ICC 3996) oluşan bir set ile belirlenmiştir. Tüm izolatlar hem 3 patotip hem de 6 fizyolojik ırk içersinde sınıflandırılmıştır. Çalışmada kullanılan izolatların 38 (59.4%)’i patotip I’e, 3 (4.7%)’ü patotip II’ye ve 23 (35.9%)’ü patotip III’e .