Estimation of Heritability and Heterosis for Agronomic Traits and Oil Content in Rapeseed Spring Varieties

In order to estimate narrow-sense heritability and heterosis for phenological traits, plant height, seed yield and oil yield, F2 progenies of half diallel crosses from six varieties including RAS-3/99, RW008911, 19H, RGS003, Option500 and PF7045/91 along with their parents were evaluated in a randomized complete block design with 3 replications. Diallel analysis revealed significant mean squares of general and specific combining abilities (GCA and SCA) for all traits, indicating the importance of additive and non additive genetic effects for these traits. However estimating of high narrow-sense heritability and degree of dominance less than one for phonological traits showed the prime importance of additive genetic effects for these traits. Heterosis range in comparison with superior parent were varied from -11.88 to -0.75, from -10.06 to -0.13, from -10.67 to -2.50, from -32.03 to 11.21, from -477.33 to 711.98 and from -327.12 to 274.62 for days to flowering, days to end of flowering, days to maturity, plant height, grain yield and oil yield, respectively. The highest yield (3431 kg/ha) was belonged to Option500 × PF7045/91.