Genetic Analysis for Yield Traits using F3 Populations in Rapeseed (Brassica napus L.)
Genetic Analysis for Yield Traits using F3 Populations in Rapeseed (Brassica napus L.)
Fazli Ahad1, Raziuddin1, Nazir Ahmad1,2*, Muhammad Nauman1, Touheed Iqbal3, Nabeel Khan1, Fazli Hameed4 and Quaid Hussain2
ABSTRACT
The present study was conducted to estimate heritability, genetic advance, and correlation coefficient in a set of 31 rapeseed genotypes, comprised of 10 parental lines and their 21 F3 populations. These genotypes were evaluated in a randomized complete block design at The University of Agriculture-Peshawar-Khyber Pakhtunkhwa-Pakistan with three repeats. Significant differences were recorded for days to 50% flowering, plant height, primary branches plant-1, main raceme length, pods main raceme-1, pod length, seeds pod-1, 1000-seed weight, seed yield plant-1 among genotypes, parents and F3 population. Similarly, parents vs. F3 population also showed significant differences for all the studied traits except primary branches plant-1 and pods main raceme-1, which revealed non-significant differences. Among parents DH4, DH5 performed better for seed yield plant-1 (15.2 g), seeds pod-1 (23.7), respectively, while DH8 showed better performance for pods main raceme-1 (76.6), pod length (7.7 cm) and 1000-seed weight (7.3 g). Cross combinations CA5 × DH6, CA5 × DH7, CA2 × DH7 and CA5 × DH3 showed potential performance for pods main raceme-1 (80.9), pod length (8.2 cm), seeds pod-1 (25.7), 1000-seed weight (7.8 g) and seed yield plant-1 (18.4 g). All the studied traits showed moderate (>30%) to high (>60%) broad sense heritability coupled with maximum genetic advance in F3 populations, hence indicated that selection could be effective in the early generation for the improvement of these traits. Correlation analysis indicated that flowering (rp=0.45), primary branches plant-1 (rp=0.49), main raceme length (rp=0.41), seeds pod-1 (rp=0.41) and 1000-seed weight (rp=0.38) had positive and significant association with seed yield plant-1. Genotypes, DH4, DH5, DH8, CA5 × DH6, CA5 × DH7, CA5 × DH3, and CA2 × DH7 displayed well genetic potential for the majority of the traits hence could be used in future rapeseed breeding programs.
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