Heterosis for Seed Yield and Its Components In Rapeseed

Muhammad Akbar, Tahira and Makhdoom Hussain


Abstract
Heterosis and heterobeltiosis were estimated for different quantitative characters in 5x5 half diallel F1 crosses involving five Brassica genotypes at Oilseeds Research Institute, AARI, Faisalabad during 2003-04. The results showed significant differences between F1’s and their parents for all traits studied except 1000-seed weight. KS75 and RBN96040 proved to be potential parents for most of the traits with highly significant maximum heterosis and heterobeltiosis for seed yield and siliquae per plant. These were followed by crosses KS75/RBN96038, RBN96040/RBN96038 and RBN96040/3/RAINBOW//DGL/ SHIRALEE for seed yield and some other yield components. So these cross combinations must be given due consideration while constituting commercial hybrids and finding out transgressive segregants in late segregating generations.

Keywords: Brassica napus; crossbreeding; hybrid vigour; agronomic characters; Pakistan.

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