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Genetic studies and heritability estimates of yield contributing traits of Brassica napus L.


The International Journal of Biological Research (TIJOBR)

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Mazhar Ullah Bashir1*, Rabail Afzal1, Muhammad Rizwan Gulzar1, Ahtsham Bilal1, Sana Zia1, Ifrah Amjad1, Azka Muneer1, Aqib Manzoor1and Muhammad Kamran1

-Corresponding author: aamizg167@gmail.com
Submitted Accepted Published
Feb 02,2018 Sep 10,2018 Dec 20,2018

2018 / Vol: 1 / Issue: 1


Abstract


The present research was conducted to find out genetic basis and heritability estimates of yield contributing traits of Brassica napus L. Seven lines ZM-R-10, OSCAR, ZM-R-30, ZM-R-16, ZM-R-17, ZM-R-5, ZM-R-21 and three testers Hyola-401 and Winer of Brassica napus were crossed in Line x Tester scheme. Twenty-one crosses and their parents were evaluated in field by following randomized complete block design with three replications. The seed of the germplasm was sown in field maintaining row to row and plant to plant distance 75 and 25 cm, respectively. Experiment was performed during the crop season of 2016-17 and 2017-18. Data were recorded on quantitative traits i.e. plant height, number of silique per plant, silique length, number of seeds per siliqua, 1000 seed weight and seed yield per plant. The recorded data were subjected to analysis of variance. Data for the traits showing significant genotypic difference were subjected to Line x Tester analysis for estimation of combining ability effects. Heritability and heterosis was estimated by statistical technique. Analysis of variance showed significant differences for all the traits in crosses parent, lines, and testers. It indicated the existence of considerable genetic variability in breeding material. Plant height ranged from 251cm to 142cm, number of silique per plant from 235cm to 61cm, silique length front 7.02cm to 5.31cm, number of seeds per silique 30 to 16, seed weight from 7.04g to 4.04g and seed yield per plant from 27.68g to 10.13g. Among lines ZM-R-17, ZM-R-30 and ZM-R-21 and testers Hyola-401 and Winer had positive and significant general combining ability for most of the traits. ZM-R-30 × Hyola-401, ZM-R-16 × Hyola-401, ZM-R-5 × Hyola-401 and OSCAR × Hyola-401 while ZM-R-5 × Winer had highest means for most of the yield related traits. OSCAR × Winer, ZM-R-16 × Hyola-401, ZM-R-5 × Glarchi, ZM-R-5 × Hyola-401 and ZM-R-21 × Glarchi had positive and significant specific combining ability. ZM-R-5 × Winer, ZM-R-30 × Glarchi and ZM-R-30 × Hyola-401 had maximum heterosis for yield and its related traits. The variances due to specific combining ability (SCA) was more than general combining ability (GCA) which showed the role of non-additive gene action for these traits. Narrow sense heritability estimates ranged from 0.01 to 0.45. Plant height, silique length, and 1000 seed weight had low heritability. Number of siliquae per plant, number of seeds per silique showed medium heritability. Seed yield per plant, number of primary branches per plant showed high heritability among all the traits. Phenological traits were also showed variation in growth habit, leaf shape, siliqua shape, siliqua colour and seed colors.

Key words: Heritability, combining ability, Brassica napus L.



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