Genetic Diversity Analysis of Restorer Lines of Rapeseed (Brassica napus L.)

Genetic diversity (GD) helps in selection of valuable parents which is the key of improving heterosis breeding and thus GD within the collected or derived germplasm should be explored. The present study aims to quantify the GD of restorer lines of rapeseeds based on seed yield components. Experiment was conducted in a Randomized Complete Block Design with three replications. First four principal components explained 35%, 24%, 16% and 10% of total variance, respectively. PC1 exhibited positive relationship with branches/plant, pods/plant, thousand-seed weight, seed yield/plant. The PC1 and PC2, projected branches/plant and pods/plant, showed positive correlation with seed yield/plant. There were also positive correlations among plant height and days with first blooming and 100% flowering and maturity. Cluster study revealed that the restorer lines were clustered into 4 clusters where Tori was the only one (cluster 4) that did not coalesce with the rest of the R lines. Clusters 1-3 consist of 10, 13 and 11 R lines. Based on above findings, diverse genotypes can be selected for the development of high yielding variety through hybridization.