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  • Küçük Resim
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    Detection of the race of Exserohilum turcicum [(Pass.) KJ Leonard & Suggs] causing northern leaf blight diseases of corn in Turkey
    (Springer, 2020) Turgay, Emine Burcu; Buyuk, Orhan; Tunali, Berna; Helvacioglu, Ozlem; Kurt, Sener
    Northern Leaf Blight caused by Exserohilum turcicum is the most significant disease in corn growing fields. The most important strategy for controlling Northern Leaf Blight is to use resistant varieties derived from qualitative and quantitative traits of corn grown around the world. Northern Leaf Blight threats to corn production because of the presence of E. turcicum races and new races potential. Therefore, in order to obtain and use resistant lines at the regional level, it is necessary to determine pathogen races. For this reason, the objective of this study was to identify races of 50 E. turcicum isolates collected by the survey carried out on 7 important corn producing areas, Sakarya, Samsun, Ordu, Adana, Mardin, Osmaniye, and Mersin provinces, belonging to the Marmara, Black Sea, Mediterranean and Southeastern Anatolia regions of Turkey. In result, 8 different races of northern leaf blight, namely 0, 1, 2, 123, N, 1 N, 3 N, 12 N were found in Turkey. The most common races were identified as race 0 and race 1. In addition, molecular identification studies confirmed the validity of morphologically identified E. turcicum isolates.
  • Küçük Resim
    Öğe
    Genetic diversity and mating-type frequency of Exserohilum turcicum in Turkey
    (Wiley, 2021) Turgay, Emine Burcu; Celik Oguz, Arzu; olmez, Fatih; Tunali, Berna; Kurt, Sener; Akcali, Efkan; Baran, Behzat
    Northern corn leaf blight caused by Exserohilum turcicum is one of the most significant diseases in maize-growing fields, resulting in yield reduction worldwide. Genetic diversity and mating-type of E. turcicum were determined using isolates collected from 7 important maize cultivation provinces in 4 different geographic regions of Turkey during 2014-2015. Multilocus haplotypes of E. turcicum isolates were characterized using 13 simple sequence repeats (SSR) primer pairs, which were amplified in PCR multiplex reactions. The evaluation of mating-type ratio generated from the E. turcicum population was by chi(2) significance test. MAT-1 and MAT-2 mating-type were shown in the population; however, the chi(2) significance test did not support the sexual reproduction hypothesis in any region. The E. turcicum population was found to produce predominantly asexual reproduction in Turkey. Numerous E. turcicum isolates showed very high genetic similarity and did not show a distinct cluster dependent on region or mating-type on a dendrogram of genetic diversity. This result showed that one-hundred per cent similarity in most of the collected isolates from different regions might also support long-distance migration.