ESTIMATION OF GENETIC PARAMETERS , HETEROSIS , PHENOTYPIC AND GENETIC CORRELATION IN DURUM WHEAT

Six durum wheat (1-) Azul-5 (2-) Yousef-1 (3-) Omgenil-3 (4-) Syrian-4 (5-) Mrb3/mna-1 (6-) Um Rabee varieties and their half diallel crosses were used to study genetic parameters, heterosis, correlation, for 1- no. of days to 50% flowering 2-plant height 3- no. of grains/spike 4- no. of spikes/plant 5- biological yield 6- grain yield 7- harvest index 8- 1000-grain weight 9- protein percentage. Significant differences were detected between genotypes at 1% of probability for all the characters. Additive genetic variance was higher than the dominance for all the characters except for 1000-grain weight and protein percentage .Narrow- sense heritability values were low for 1000 grain weight and moderate to protein percentage two characters. The average degree of dominance value was less than one for all the characters except no. of spiks for 1000-grain weight and protein percentage .Heterosis was obtained for Azul-5 x Syrian-4 for no. of spikes/plant, biological yield ,grain yield ,harvest index and protein percentage. Genetic correlation was positive and significant between grain yield and each of number of days to 50% flowering , no. of grains/spike, biological yield, and harvest index.