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Genetic studies of agronomic characters in Brassica napus L.


The International Journal of Biological Research (TIJOBR)

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H. M. Umair Waqas1*, Farooq Ahmad Khan1, Areeba Jahan1, M. Zubair Khan1, M. Sheraz Rasheed1, H. Ahsin Ali1, Aqsa Liaqat2

1Department of Plant Breeding and Genetics, University of Agriculture Faisalabad, Pakistan.

2Department of Botany, University of Agriculture Faisalabad, Pakistan.

Corresponding author’s email: umairpbg75@gmail.com 

Submitted Accepted Published
May 26,2019 Jul 02,2019 Jul 20,2019

2019 / Vol: 2 / Issue: 2


Abstract


The current experiment was performed for genetic studies of yield contributing traits in Brassica napus L The cross combinations were made using Line × Tester mating scheme using five lines (Rainbow, Duncled, ZM-2, Cyclon, ZMR-23) and three testers (Zafar-2000, DGL, Legend). Hybrids developed through crosses and their parental genotypes were sown in Randomized Complete Block Design (RBCD) in the research area of the Department of Plant Breeding and Genetics, University of Agriculture, Faisalabad. All the plant material was assessed and estimated for combining ability and divergence for the important yield contributing attributes. Data recorded for plant height, days to initiate flowering, days to 50% flowering, no. of primary branches, no. of secondary branches, siliqua length, no. of grains siliqua-1, no. of siliquae plant-1, seed yield plant-1, 1000 grain weight, oil contents % and protein contents %. Hybrids having better performance in yield and yield-related attributes were selected. Among lines Duncled proved to be good general combiner for days to initiate flowering, siliqua length, no. of grains per siliqua and protein contents and ZM-2 proved to be good general combiner for plant height, no. of secondary branches and oil contents. Cyclon showed significant GCA effects for days to 50% flowering, no. of primary branches and 1000 grain weight and ZMR-23 showed significant results for no. of siliquae per plant and seed yield per plant. In the testers Zafar-2000 proved to be good general combiner for plant height and protein contents. No tester showed significant results in desired direction for days to initiate flowering, no of secondary branches and oil contents. Rainbow × DGL proved to be good specific combiner for no. of secondary branches, Rainbow × Legend for no. of siliquae per plant, ZM-2 × Zafar-2000 for days to initiate flowering and days to 50% flowering, ZM-2 × DGL for no. of grains per siliqua, Cyclon × Zafar-2000 for no. of primary branches, siliqua length, seed yield per plant and 1000 grain weight, Cyclon × DGL for plant height, Cyclon × Legend for oil contents and protein contents. Genetic information acquired from this study offer chances to rapeseed breeder for the rapid improvement for early maturing and high yielding varieties and other yield attributing parameters in Brassica napus L. 

Key words: Rapeseed, Gene action, combining ability, heterosis


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