PJB-2018-397
Heterotic response and combining ability analysis in F1 diallel populations of Brassica napus L.
Samrin Gul, Razi Uddin, Naqib Ullah Khan, Shahid Ullah Khan, Sardar Ali, Naushad Ali, Mohammad Sayyar Khan, Muhammad Ibrahim, Rabia Goher, Muhammad Saeed and Dildar Hussain
Abstract
Eight Brassica napus L. genotypes including Rainbow, Rustam Canola, Dunkled, Abasin-95, NIFA Gold, Durr-e-NIFA, Punjab Sarsoon and Faisal Canola, varied by genetic makeup and yield traits were crossed during 2014-15 in a 8 × 8 complete diallel fashion at the University of Agriculture, Peshawar, Pakistan. Parental genotypes and their 56 F1 hybrids were sown during 2015-16 in a randomized complete block design to evaluate through mean performance, heterosis and combining ability effects. Significant (p≤0.01) differences were observed among the parental genotypes and their F1 hybrids for all the studied traits. The F1 hybrids NIFA Gold × Rustam Canola, Rustam Canola × Punjab Sarsoon and Punjab Sarsoon × Abasin-95 exhibited best mean performance and maximum mid- and better-parent heterosis for plant height, 1000-seed weight and seed yield per plant. Combining ability analysis revealed significant (p≤0.01) mean squares due to general (GCA), specific (SCA) and reciprocal combining ability (RCA) for all the traits indicating the importance of additive, non-additive and maternal effects. For plant height and main raceme length, the mean squares due to GCA were greater in magnitude than SCA and RCA. However, for 1000-seed weight and seed yield per plant, the mean squares due to RCA were found greater followed by SCA and GCA. Results further enunciated that due to the preponderance of GCA and RCA effects, the contribution of additive and maternal effects was more important in the expression of these traits. Parental genotypes Abasin-95 and Punjab Sarsoon were found as best general combiners and performed better in combination with other genotypes for the majority of the traits. The F1 hybrids NIFA Gold × Rustam Canola, Rustam Canola × Punjab Sarsoon, Punjab Sarsoon × Abasin-95 and Dunkled × Rainbow exhibited best mean performance and renowned SCA for yield traits. The variances due to σ2SCA were higher than σ2GCA and σ2RCA. The ratios of σ2GCA/σ2SCA were noted to be less than unity which revealed that all the traits were controlled non-additively and hence, the delayed selection in later segregating generations might be more effective. Based on the GCA and SCA effects and mean performance, the promising parental genotypes and F1 hybrids could be further utilized in future breeding programs to develop the rapeseed genotypes with good yield potential and oil quality traits.
To Cite this article:
Gul, S., R. Uddin, N.U. Khan, S.U. Khan, S. Ali, N. Ali, M.S. Khan, M. Ibrahim, R. Goher, M. Saeed and D. Hussain. 2019. Heterotic response and combining ability analysis in F1 diallel populations of Brassica napus L. Pak. J. Bot., 51(6): DOI: http://dx.doi.org/10.30848/PJB2019-6(36)
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