Comarsion of different wheat species and genotypes for yield and yield formation, under Çukurova lowland conditions

To supply information needed for future effective breeding, yield and yield formation of different genotypes of bread (Triticum aestivum L.), durum (Triticum turgidum spp. Durum (Desf.) and non-durum tetraploid (Triticum turgidum) wheat species were compared under Çukurova lowland conditions.Averaged over genotypes grain yields were 143 g m-2, 284 g m-2 and 300 g m-2 in non-durum tetraploids, durums and aestivums, respectively. Nor significant differences between species were observed for biomass, although values between genotypes in were obtained ranged from 790-1915 g m-2.Yield of wheat species were significantly and negatively associated with heading time (r = -0,751 **), number of spike (r = -0.922 **) and plant height (r = -0,861 **). In species, grain yield showed the strongest positive assocation with harvest index (r = 0.870 **). The assocations of yield with number of grains (r = 0.650 *) and grain weight (0.670 *) were moderate, while it was unrelated with biologial yield Harvest index was strongly associated with grain weight (r = 0.739 **) but unrelated to the number of grains. Keywords: Emmer, Dicoccum, Durum Wheat, Bread Whead, Grain Yield, Grain Yield Formation