Genetic evaluation of some phonological and morphological traits of oilseed rape (Brassica napus L.) Genotypes by line×tester method

Given the importance of estimating combinability, heritability, genetic variance components and gene performance in designing breeding programs, an experiment based on the line×tester method with fifteen hybrids of oilseed rape derived from crosses of five average yielding cultivars includes SPN3, SPN9, SPN36, SPN30, DH4, with three spring and high yielding testers (SPN34, RGS003, SPN1) was performed using a randomized complete blocks design with two replications. The differences between hybrids for all traits, except flowering time, were significant. In the genetic control of traits, the importance of addictive effect of genes for all studied traits were estimated except for stem diameter and grain yield. The general heritability of the traits was very high and was estimate from 86.03% for stem diameter to 98.53% for the days to end of flowering. Minimum and maximum of the private heritability were also moderately high for the studied traits were56.83% and 91.63% for stem diameter and number of branches, respectively. Among the studied genotypes, SPN1 as a tester and DH4 and SPN30 as lines had the most combinability. Due to the superiority of DH4×RGS003، RGS003×SPN36 and SPN30×RGS003 hybrids, they can be recommended for hybrid cultivars production in the future breeding programs.