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    Determination of Variability Between Grain Yield and Yield Components of Durum Wheat Varieties (Triticum durum Desf.) in Thrace Region
    (Namık Kemal Üniversitesi, Ziraat Fakültesi, 2008) Bilgin, Oğuz; Korkut, Zahit Kayıhan; Başer, İsmet; Dağlıoğlu, Orhan; Öztürk, İrfan; Kahraman, Turhan
    Variability of grain yield and some yield components of 17 durum wheat varieties with native and exotic originated was investigated. This research was performed under rainfed conditions in three different environments (Tekirdağ, Lüleburgaz and Edirne) during two growing years (2001-2002 and 2002-2003). Significant differences among cultivars, locations and production years were determined. The highest variations among characters were found in grain weight/spike, grains/spike, spike length and grain yield. In the first experimental year, there was a high positive significant correlation between grain yield and grain weight/spike, test weight and 1000 grain weight. In the second experimental year, grain yield showed positive and significant correlations with 1000 grain weight, test weight and stem length. The biggest differences among investigated cultivar of durum wheat were found in stem length, grains/spike and 1000 grain weight. Grain yield of examined cultivars depended mainly on 1000 grain weight, test weight, grain weight/spike and agroecological conditions during the growing period. However, location, production year and genotypes were the most important determinant of potential yield of cultivars. Ç 1252, Fuatbey 2000, Epidur, Kızıltan95, Aydın 93 and Altın 97 were found more suitable cultivars that the others for durum wheat production in Thrace Region.
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    Genetic Variation and Inter-Relationship of Some Morpho-Physiological Traits in Durum Wheat (Triticum Durum (L.) Desf.)
    (Pakistan Botanical Soc, 2011) Bilgin, Oğuz; Korkut, Kayıhan Zahit; Başer, İsmet; Dağlıoğlu, Orhan; Öztürk, İrfan; Kahraman, Turhan; Balkan, Alpay
    In this study which was performed with 20 durum wheat genotypes at three locations during two crop seasons. The relative large variations were observed for the characters except test weight and days to 50% flowering. The highest heritability and expected genetic advance values were estimated in plant height (92.8%-9.84) and 1000 grain weight (90.2%-5.96). The lowest value of heritability and expected genetic advance were obtained for grain yield (51.4%-0.94) and test weight (63.8%-2.41). Grain yield was positive and significantly correlated with grain weight/spike, test weight, plant height, grains/spike, spikelets/spike, 1000 grain weight and spike length whereas it showed negative and important correlation coefficient with days to 50% flowering. The highest direct positive effect (0.3857) on yield was computed for grain weight/spike. On the other hand, days to 50% flowering and spike length had negative direct effect on yield. Although grain weight/spike should be emphasised as reliable selection criteria, grains/spike, 1000 grain weight, plant height and earliness might be considered as indirect selection criterion for improvement in durum wheat yield potential.