Study on heritability and path analysis of different traits, seed yield and oil yield of canola in climatically condition of KhoramAbad, Iran

For study of genetic diversity among canola genotypes, an experiment was carried out based on randomized complete block design with three replications in KhorramAbad, Iran. Fifteen genotypes were studied in each block and each plot consists of 5 rows 5 m length and 30 cm distance among rows. Different traits were evaluated including morphological, phonological, yield and yield components. Analysis of variance showed significant differences for days to 50% of flowering, plant height, days to maturity, siliques per plant, seeds per silique, 1000 seed weight, grain yield, oil percent and oil yield. Means comparisons among genotypes showed significant differences for all traits, indicating existence of genetic diversity among genotypes. SLM-046 genotype with average values of 4177 and 1817 kg h-1 grain and oil yield, respectively had higher performance among genotypes. Correlation coefficient of grain yield with 1000 seed weight, seed per silique, silique per plant, silique length, oil percent and oil yield was positive and significant. Phenotypic coefficient of variation was higher than genotypic coefficient for all traits, indicating the significant affects of environment conditions. Estimate of heritabilities were high for all traits except plant height. Result of path analysis showed that silique length, silique per plant and oil percent had significant effect on grain yield. Cluster analysis classified all genotypes to three groups and Sahra and Sunday showed highest genetic distance.