Genetic Variability, Correlations and Heritability Estimates for Various Biochemical Traits in Rapeseed ( Brassica napus L.)

摘要

To estimate genetic variability, correlations and heritability among various Brassica napusgermplasm, an experiment was conducted comprising fifteen rapeseed genotypes during 2014-2015 at NewDevelopmental Farm, The University of Agriculture Peshawar Pakistan. Rapeseed genotypes were laid out ina randomized complete block design (RCBD) with three replications. Data were recorded on following qualitytraits viz., oil content (%), protein content (%), glucosinolates content (μmolg 1) and erucic acid content (%).Analysis of variance revealed significant difference (P=0.01) for all the traits, except erucic acid content (%).Mean values for quality traits ranged between 48.51–53.17, 17.87–21.79, 59.82–95.93, 44.52–57.28 for oil content(%), protein content (%), glucosinolates content (μmolg 1) and erucic acid content (%), respectively. GenotypeCA4 displayed maximum mean value (53.17 %) for oil content and minimum value of 17.87 %and 59.82 (μmolg 1)for protein content and glucosinolate content, respectively. Whereas, genotype PGR17 exhibited maximum meanvalue of 21.79 % and 95.93 (μmolg 1) for protein content and glucosinolate content, respectively. On the otherhand PGR17 revealed minimum mean value (48.51 %) for oil content. The maximum mean value (57.28%) forerucic acid was recorded for genotype CH6 and minimum (44.52 %) was recorded for genotype CH1. Themaximum broad sense heritability was observed for glucosinolates content (0.45), protein content (0.34)followed by erucic acid content (0.25) and oil content (0.24). Highly significant positive phenotypic correlationfor protein content was observed with glucosinolates content whereas, highly significant negative associationfor oil content was examined with protein content and glucosinolates content. Based on the results of thisstudy, genotype “CH-4” performs superiorly with maximum oil content and low glucosinolates content. Hence,could be used as parentage in future breeding program.