PJB-2024-242
Genetic analysis of quantitative and qualitative traits in Brassica napus L. using F2 progenies of diallel crosses through Hayman’s approach
Faiz Ur Rehman, Muhammad Saleem Khan, Mansoor Ali Shah, Sikandar Aziz, Muhammad Ali Shah and Syed Majid Rasheed
Abstract
This study was aimed at assessing a detailed genetic analysis of five parental populations of Brassica napus L. along with its F2 population using Hayman’s approach. A significant contribution of F2 crosses was noted for important traits, including BKUC7 x BKUC8 for days to 50% flowering (67 days), BKUC3 x BKUC7 for maximum plant height (105.5 cm) and siliqua plant-1 (86), BKUC3xBKUC8 for highest oil content (42.6%) and BKUC4 x BKUC8 for high protein content (27.4%). The results showed that self-combination of BKUC4 and BKUC8 had the least glucosinolate concentration (52.2%) while the highest level was of oleic acid (55.0%). Likewise, the lowest erucic acid concentration (41.7%) was recorded for BKUC2xBKUC4. A negative inbreeding depression for days to 50% flowering initiation (-2.48%) and glucosinolate (-17.79%) and linoleic acid (-43.13%) concentrations was recorded for P4, while that of erucic acid (-27.31%) was noted for P1. BKUC2 x BKUC3 has shown a desired negative heterosis of -14.86% and -19.43% for days to 50% flowering and erucic acid concentration, respectively. Similarly, BKUC2 x BKUC8 has shown a positive heterosis for oil content (13.18%). Protein content (4.83%) and oleic acid concentration (3.15%) were evident for BKUC4 x BKUC8, while BKUC2 x BKUC7 displayed a desired negative heterosis up to -21.14% for GSL. Statistical analysis has shown a significant role of GCA and SCA for all traits except siliqua plant-1, which validates the active role of additive and non-additive genetics. Over-dominance and partial dominance gene action were mainly observed for all traits in this study. Overall, a high heritability and desirable positive and negative heterosis for most important traits, like oil content, erucic acid and glucosinolate concentrations, protein content, and days to 50% flowering were observed in our study. In conclusion, our findings provide new insights for future breeding studies on the F2 progenies of diallel crosses of B. napus L
To Cite this article:
Rehman, F.U., M.S. Khan, M.A. Shah, S. Aziz, M.A. Shah and S.M. Rasheed. 2025. Genetic analysis of quantitative and qualitative traits in Brassica napus L. using F2 progenies of diallel crosses through Hayman’s approach. Pak. J. Bot., 57(4): DOI: http://dx.doi.org/10.30848/PJB2025-4(17)
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