PJB-2018-1747
Heterotic and genetic effects in intra-specific populations of Brassica napus L.
Samrin Gul, Razi Uddin, Naqib Ullah Khan, Mohammad Sayyar Khan, Shahid Ullah Khan and Rabia Goher
Abstract
Eight parents viz., Rustam Canola, Abasin-95, NIFA Gold, Durr-e-NIFA, Punjab Sarsoon, Faisal Canola, Rainbow and Dunkled were crossed in a complete diallel fashion in rapeseed (Brassica napus L.). The resultant 56 F1 hybrids along with eight parental genotypes were grown in a randomized block design with two replications and evaluated for genetic variability, heterosis and combining ability through earliness, morphological and yield traits. The F1 hybrids and their parental cultivars revealed highly significant differences for all the traits which revealed that breeding material has greater genetic variability and scope for further improvement through intensive selection. Mean squares due to general combining ability (GCA), specific combining ability (SCA) and reciprocal combining ability (RCA) were found highly significant (p≤0.01) for days to maturity, secondary branches per plant, pods per plant, seeds per pod and seed yield per plant which signifying the equal shares of both additive and dominance genetic effects. However, the variances due to σ2SCA were higher in magnitude than σ2GCA, and the ratios of σ2GCA/σ2SCA were also below than unity which revealed the predominance of non-additive gene action for inheritance of all the traits. Parental cultivars Punjab Sarsoon and Dunkled were identified as best general combiners and performed better for the majority of the traits. Therefore, these general combiners produced some best specific cross combinations with the promising mean performance which involve high × high, low × high and high × low GCA parental genotypes. The F1 hybrids Dunkled × Rainbow, Abasin-95 × NIFA Gold, Durr-e-NIFA × Punjab Sarsoon, Rustam Canola × Punjab Sarsoon and Punjab Sarsoon × Abasin-95 revealed best mean performance for earliness, morphological and yield traits hence these genotypes could be used in the future breeding programs.
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