Scholarly Journal of Agricultural Science Vol. 3(8), pp. 299-304, August 2013
Available online at http:// www.scholarly-journals.com/SJAS
ISSN 2276-7118 © 2013 Scholarly-Journals
Genetic analysis of oil content and quality parameters in Indian mustard (Brassica juncea (L.) Czern and Coss)
Oil quality Laboratory, Department of Genetics and Plant Breeding, SVP, University of Agriculture and Technology, Meerut, India-250110. E-mail: firstname.lastname@example.org.
A two-year study was carried out during rabi 2006 to 2007 and 2007 to 2008 with 24 parents and 80 F1 crosses of Indian mustard to assess the nature of variability and association for fatty acid profile and oil content. Analysis of variance indicated significant differences for all the quality characters investigated. The environmental effects were significant for erucic and oleic acid content and the influence of environmental factors appeared to be less on other characters. The genotype × environment interactions were non-significant for all the characters, hence, the data were pooled over the years and discussed on the basis of mean of two years. The coefficients of variation at phenotypic level varied from 4.6% for oil content to 50.9% for oleic acid. The genotypic coefficients of variability were high for oleic, palmitic + stearic, erucic and linolenic acid, erucic acid and palmitic acid + stearic acid had the least genotypic variation (GCV: 16.3 to 16.9%). The heritability in broad-sense was relatively high for oleic (61.5%) and erucic acid (56.3%). The high heritability was associated with high genetic advance only for oleic acid suggesting the role of additive gene action in the inheritance of this character. Erucic acid negatively and significantly correlated with the rest of the fatty acids except linolenic acid and significant correlation with oleic (r = -0.536) and eicosenoic acid (r = -0.260). Although, oil content had very low direct effect (-0.011) on erucic acid but its positive association was the result of its strong positive indirect effect through oleic acid (0.435), which was partially neutralized by negative indirect effects (-0.112) through linolenic acid. The implications of these results in the quality-breeding programme were discussed in this paper.
Key words: Indian mustard, correlation coefficients, path analysis, fatty acid content, oil content.