Correlation Between Traits and Path Analysis for Grain and Oil Yield in Spring safflower

A.H.OMIDI TABRIZI 

Abstract

In order to study correlation among seed and oil yield with their components through the path coefficient analysis method, an experiment with 100 Safflower genotypes was conducted at the research farm of S.P.I.I., In 1998. The experimental design was a 10x10 simple lattice. The results showed that there was good agreement between phenotypic and genotypic correlations. For most characters, genotypic correlation coefficients were higher than phenotypic correlation coefficients and there were highly significant positive correlations between biomass and number of heads/plant with seed yield.  Stepwise regression for seed and oil yield indicated that 4 traits including biomass, number of heads/plant, number of secondary branches entered to model. The results of path coefficient analysis revealed that increase of oil yield was primarily associated with increasing seed yield which was affected by biomass and number of heads/plant.

Key words:  traits, path analysis, phenotpic, genotypic