Yildirim, Mustafa; Çakmak, Mustafa

Grain yield estimate from early segregating populations is an interesting feature of today s wheat breeding programs,and F 1 populations are generally recommended as the most suitable population by researchers. In the present study,we evaluated the population vigor of diallel F 4 offsprings of six bread wheat genotypes (Sultan, Bezostaya, Süzen,Harmankaya, Altay and Gerek) under irrigated (IR) and rain-fed conditions (RF). The experiment as two sets under IRand RF were established in the feld of Anatolian Agricultural Research Institute, Eskişehir. The mean of grain yield(5468 kg ha -1 ) of F 4 populations in RF and IR had been lower than the mean of genotypes (5654 kg ha -1 ). The mean ofgrain yield of genotypes (7062 kg ha -1) under IR was higher than F 4 populations (6703 kg ha -1 ), while genotypes and F 4populations were nearly similar under RF (4246 kg ha -1 and 4234 kg ha -1, respectively). The mid-variety population vigorfor grain yield varied from -6.70% (Hrm/Grk) to 8.77% (Bez/Grk) under RF, and from -22.58% (Sltn/Alty) to 10.87%(Bez/Süzen) under IR. There was not positive signifcance population vigor in F 4s. According to results under RF andIR, F 4 populations are observed as the most suitable populations for realistically estimation of grain yield performanceof populations.