Analysis Main Effective Traits on Grain Yield of Spring Canola Genotypes by Path 74 Software under Khuzestan Climate Condition

To determine the most important traits affecting grain yield and assessment the amount of direct and indirect effects on grain yield of each of ten rapeseed cultivars were selected and in a randomized complete block design with three replications were studied. The evaluation of correlation coefficients illustrated that total dry matter, harvest index, thousand seed weight, number of seeds per pod, number of pods per plant, plant height, days to maturity and flowering period trait have had a significant positive correlation with grain yield. Stepwise regression and path analysis indicated that number of pods per plant had the highest direct effect on grain yield. Grain weight indirectly by increasing the number of pods per plant and total dry matter yield, flowering and maturity period traits had high direct effect on grain yield. Thus, direct selection for these traits is suggested.