Author(s): Anil Chandra Deb* and Rumman Ara

Affiliation: *Department of Genetic Engineering and Biotechnology, University of Rajshahi, Rajshahi-6205, Bangladesh

Abstract: This investigation was undertaken to measure the heterotic effects and adequacy of the additive-dominance model in onion. Maximum crosses exhibited significant heterosis over mid and better-parents for most of the characters indicating good sign for improvement onion varieties. Potence found to be non-significant in maximum crosses indicating the absence of dominance. Significant and non-significant χ² values with [h] and without [h] were noted in different crosses for different characters. In all the crosses for number of leaves except P₁ ´ P₃ with dominance showed non-significant χ2 values indicated that the model is adequate. Besides, P₁ ´ P₃ and P₁ ´ P₅ for bulb weight, P₂ ´ P₅ for bulb yield/plot with dominance showed non-significant χ² values as well as significant potence indicated the adequacy of the model. Again, crosses P₂ ´ P₃ and P₃ ´ P₄ without dominance for bulb weight and bulb yield/plot showed the adequacy of the model. A similar trend was recorded for bulb volume in all the crosses except P₁ ´ P₄ and P₂ ´ P₅. The adequacy of the model indicated that only additive and dominant genes are responsible for controlling these traits. From this study, it may conclude that crosses P₁ ´ P_3,P^­₁ ´ P₅, P₂ ´ P₅, P₃ ´ P₄ and P₃ ´ P₅ are promising in respect of bulb weight, bulb yield/plot and bulb volume and indicate that they would likely help do successful breeding plan easily for the improvement of potential varieties in onion.

DOI: 10.22271/2582-3744.2021.sep.90

Pages: 90-101 | Views: 211 | Downloads: 139

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