Evaluation of seed and oil yields and their components and relationships in oilseed rape genotypes under East Azarbaijan conditions in Iran

Seed and oil yields, their components, and the relationships among trait performance were determined in ۲۵genotypes of winter type oilseed rape (Brassica napus L.). The experiment was carried out at the Agricultural and Natural Resources Research Center of East Azerbaijan, Iran, in two consecutive growing seasons ۲۰۰۹-۱۰ and ۲۰۱۰- ۱۱. Significant differences were observed in plant height, number of pods per plant, number of seeds per pod, ۱۰۰۰- seed weight, harvest index, and seed and oil yield. Cluster analysis divided the genotypes into two groups based on the studied traits. One group consisted of ۱۶ genotypes with low and the other included ۹ genotypes with high seed and oil yield. Based on observations, genotypes SW۱۰۲, HW۱۰۱, HW۱۱۱, L۶۲, L۷۲, L۱۳۹, SW۱۰۴, Karaj۱, and Karaj۲ showed high seed and oil yields and would therefore be suitable for the Tabriz plain and areas with similar conditions and for selecting genotypes tolerant to environmental stress. A positive correlation was found between plant height and number of seeds per pod, and seed and oil yields. Number of pods per plant contributed more to seed yield among seed yield components. Harvest index and ۱۰۰۰-seed weight had the highest and the lowest indirect effects on oil yield, respectively. It appears that harvest index and plant height are important features for selectingwinter type oilseed rape genotypes for Tabriz plain and areas with similar conditions.

Keywords:

cluster analysis , Oilseed rape , path analysis , seed and oil yields