Selection of superior Brassica napus L. hybrids by integrated graphical and numerical diallel analysis by yield×traits: Using hayman and biplot diallel approaches

Improving yield via assessment of different yield-related genetic parameters specifically with the challenges of yield × traits combination is a prominent issue for plant breeders. A graphical and numerical description of diallel analysis by yield × traits with the novelty of the parent selection with desirable genetic architecture in rapeseed was illustrated via Hayman and biplot approaches. Eleven divers' parents and their F₁ offspring, achieved via a complete diallel mating fashion, were evaluated under field conditions based on randomized complete block design replicated thrice throught 2018-2020. Integrated yield × traits analysis revealed highly significant additive and non-additive gene effects which were confirmed by the meaningful general and specific combining ability of evaluated multi-traits. Graphical Wr-Vr analysis, depicted partial dominance gene action for yield × traits, except yield × thousand grain yield which is governed by over-dominance gene action.The biplot polygon panorama identified the most desirable heterotic parents with higher general and specific combining ability, and more dominant genes including [(P9) × (P4, P6, P10) for yield × pod]; [(P9) × (P7), (P6) × (P11) and (P7) × (P10) for yield × thousand grain yield] and [(P10 × P3) for yield/flowering, yield/physiological maturity, yield/plant height]. These findings suggested that a breeder should consider superior parents with high × high general and specific combining ability according to combining their yield and its related genetic parameters as important traits with all other target characters via descripted approaches.