3. Assessment of traits association in rapeseed (Brassica napus) under the rainfed environment

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Tahira, Ihsan Ullah Khan, Mubashir Ahmad Khan, Sundas Waqar, Waqas Manzoor Bhutta, Aqsa Saeed


During Rabi 2016-17, the impact of various plant traits on seed yield of twenty advanced rapeseeds (Brassica napus) lines, including flowering, maturity, height, pod length, branches, number of pods, number of seeds pod-1, thousand seed weight, and oil content, were evaluated in a field experiment conducted at NARC. The genotypic coefficient of variation (GCV) and phenotypic coefficient of variation (PCV) confirmed the presence of considerable genetic variability in the base population. Seed yield (kg/ha) exhibited high (86.8%) heritability in broad sense (h2b) along with very high genetic advance (332%) inferring the presence of additive genes action for the expression of this character. Correlation coefficient presented that seed yield was positively significantly correlated with branches plant-1, pods plant-1 and oil contents at the genotypic level and with pods plant-1 at the phenotypic level. The results of path coefficient analysis revealed positive direct effects of days to 50% flowering, days to maturity, branchesplant-1, pods plant-1 and 1000 seed weight.

Keywords: Association analysis; Correlation; Genetic advance; Heritability; Path coefficient; Rapeseed and seed yield; Pakistan


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