Abstract
Heterosis and epistasis in spring oilseed rape (Brassica napus L.) was analysed by comparing generation means for ten agronomic traits. Parents, F2, F3 and F6 generations of four crosses with Swedish and French material were investigated. The F2 was 11% higher in yield, earlier in flowering time, and slightly later in maturation when compared with the parents. Randomly derived single seed descent lines had an 8% lower yield, were later flowering and maturing than the parents in F6. This poorer average performance of recombinant lines is explained by the loss of favourable epistatic interactions present in the parents.
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