Cilt:25 Sayı:01 (2019)

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https://dspace.ankara.edu.tr/handle/20.500.12575/74954

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Browsing Cilt:25 Sayı:01 (2019) by Author "Karakaya, Aziz"

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    Identification of Hordeum spontaneum Genotypes Resistant to Net Blotch Disease
    (Ankara Üniversitesi, 2019-03-13) Oğuz, Arzu Çelik; Karakaya, Aziz; Duran, Rukiye Murat; Özbek, Kürşat; Ziraat Fakültesi
    Wild barley (Hordeum spontaneum) is a progenitor of cultivated barley and naturally grows in Turkey. H. spontaneum genotypes possess superior characteristics for biotic and abiotic stress tolerance factors. In this study, 3 virulent Pyrenophora teres f. maculata and 3 virulent P. teres f. teres isolates were tested under greenhouse conditions in order to find net blotch resistant H. spontaneum genotypes. A total of 104 H. spontaneum genotypes were used. Twenty-six H. spontaneum genotypes which corresponded to 25% of the genotypes (genotypes numbered 8, 13, 14, 16, 22, 24, 27, 31, 37, 44, 47, 54, 58, 62, 65, 66, 69, 74, 78, 81, 89, 94, 99, 102, 104 and 107) exhibited reactions classified in the resistant group to 3 virulent P. teres f. maculata isolates. Eight H. spontaneum genotypes which corresponded to 7.6% of the genotypes (genotypes numbered 24, 27, 29, 33, 44, 54, 89 and 94) exhibited reactions classified in the resistant group to 3 virulent P. teres f. teres isolates. Six H. spontaneum genotypes which corresponded to 5.7% of the genotypes (genotypes numbered 24, 27, 44, 54, 89 and 94) exhibited reactions in the resistant group to both 6 virulent P. teres f. teres and P. teres f. maculata isolates. In addition, a considerable number of genotypes exhibited resistant group reactions to one or two isolates of both forms of the pathogen. These genotypes could be used for developing net blotch resistant barley cultivars.
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    Seedling Response of Iranian Barley Landraces to Pyrenophora teres f. teres and Pyrenophora teres f. maculata
    (Ankara Üniversitesi, 2019-03-13) Oğuz, Arzu Çelik; Rahimi, Amir; Karakaya, Aziz; Ziraat Fakültesi
    Net blotch caused by Pyrenophora teres is an important pathogen of barley plants worldwide. There are two biotypes of the fungus. Pyrenophora teres f. teres (Ptt) causes the net form of the disease and Pyrenophora teres f. maculata (Ptm) causes the spot form of the disease. Barley landraces are good sources of disease resistance. In this study, seedling response of 25 barley landraces obtained from different regions of northwest Iran to 3 single spore isolates of Ptt and 3 single spore isolates of Ptm were determined under greenhouse conditions. Differences in virulence among the isolates were evident. Some landraces showed different responses to different isolates. Landraces # 9 and # 16 showed moderately resistant reactions to one isolate of Ptt and showed moderately resistant-moderately susceptible reactions to 2 isolates of Ptt. Landraces # 7, # 11, # 15, # 17, # 21, # 22, # 23 and # 25 showed moderately resistant-moderately susceptible reactions to all 3 isolates of Ptt. Landrace # 23 showed resistant-moderately resistant reaction to one isolate of Ptm and showed moderately resistant reactions to 2 isolates of Ptm. Landrace # 16 showed moderately resistant reactions to all isolates of Ptm. Landraces # 11, # 15, # 21 and # 25 showed moderately resistant reaction to one isolate of Ptm and showed moderately resistant-moderately susceptible reactions to 2 isolates of Ptm. Landraces that exhibited reactions between resistant and moderately resistant-moderately susceptible range could be used as a direct seeding material to the field or could be used as breeding materials.