Estimates of genetic variability parameters and interrelationships of morpho-physiological traits in yellow sarson (Brassica rapa L. var. yellow sarson)
Abstract
The objective of investigation was to assess the heterosis, heritability in broad sense, inbreeding depression and inter-relationships among the quantitative traits in six intra-specific crosses developed in yellow sarson. The experimental material comprised six parental genotypes, 12 F1 and F2 populations, grown in complete randomized block design with three replications. Data on ten morpho-physiological traits were recorded. Results revealed significant differences for all yield and quality characters indicated the presence of sufficient genetic variability for effective selection. In all cross combinations, hybrids performed better than their respective parents and significant positive standard and better parent heterosis was observed for the trait seed yield per plant. Based on high mean performance and heterotic values, hybrids and their corresponding parental lines under this study can be exploited further for commercial hybrid production. Positive Inbreeding depression in F1-2 families ranged from 0.01 to 31.38 percent for length of fruiting zone in Ragni x NDYS-425 and primary branches per plant in Jagrati x YST-151 cross, respectively. High heritability (95.73 cm) coupled with high genetic advance were noticed for length of fruiting zone (Ragni x YST-151) and for seed yield per plant in Jagrati x YST-151, NDYS-427 x YST-151, Pusa Gold x Jagrati and Ragni x NDYS-425 crosses. Seed yield per plant showed highly significant and positive association with primary branches per plant and siliqua length.
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