| Agronomic and quality traits introgressed into doubled haploid (DH) lines from an interspecific cross of B. napus × B. rapa were investigated. The interrelationships of these traits i.e. oil, protein, seed yield, maturity, days to first flower, and duration of flowering were also examined.; Three selected DH lines were tested at three locations over two years at Michener, Ellerslie, and Kelsey. Seed yields of the three DH lines were slightly higher than the B. rapa parents but were significantly lower than the B. napus cultivar Quantum. Although yields were low for the three lines, their 1000-kernel weights were significantly higher than all other cultivars studied. The selected DH lines expressed a B. napus maturity pattern averaging 102.5 days. Days-to-flower was intermediate between B. napus and B. rapa, and duration of flowering showed no association with either species. Two of the three DH lines protein levels averaged 48.6 percent, while the oil content of the DH lines tended to be lower than either parent. The oil quality of these lines tended to be high in linolenic and saturated fatty acids, both of which are undesirable traits in a breeding program.; Positive associations were found between maturity and the following traits: 1000-kernel weight, seed yield, and days to first flower. A significant positive relationship was also observed between days-to-flower and yield. These positive relationships suggest that selecting for higher yielding cultivars may be obtained by selecting either for increasing days-to-flower or increasing maturity. Seed oil was negatively associated with both 1000-kernel weight and days to maturity.; A test correlating field vigor with vigor in a laboratory cold test was preformed on all genotypes in the study. A positive correlation between field vigor and the cold test vigor was observed among the genotypes, a result supported by earlier studies. |
