Seed and oil yield in sunflower are complex traits, which are products of interactions between a number of other traits. Thus, an evaluation of different traits and a study of their interrelationships are of great importance. Using 111 sunflower recombinant inbred lines and their 2 parents, morphological traits, oil content as well as their interrelationships were studied. There was a negative correlation between oil content and seed weight. Branched lines bore more seed oil content in comparison with non-branching types. This might be attributed to the plant bearing smaller seeds. Applying chi-square test, segregation of some traits was also studied. Using factor analysis, six factors were extracted which accounted for %85.84 of variations among data. Paired t-test revealed that open pollinated seeds carried more oil content, but open pollination had no effect on seed weight. Regression analysis showed that days to flowering and head diameters were main determinants affecting oil content.
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