Analysis of qualitative and quantitative G x E interaction to assess the performance of genotypes of mustard (Brassicajuncea L.) in rainfed conditions of Kashmir valley

To detect the presence of qualitative and quantitative G x E interactions the 33 genotypes of mustard were evaluated for eight quantitative traits during rabi 2005–06, 2006–07, 2007–08 and 2008–09 and data were subjected to regression analysis and also the analysis to detect the presence of qualitative and quantitative G x E interactions. The presence of qualitative and quantitative G x E interaction was trait and genotypic specific and on the basis of that the behaviour of genotypes with respect to their performance was determined. The 12 genotypes, namely, IC-241657, EC 365604, IC 261702, 1C 310803, IC 261720, IC261681, EC 367883, EC 383412, IC 261764, IC 310805, IC 312486 and IC 261736 were identified to be significantly above average and also significantly superior to the check Pusa Jaikisan in terms of mean seed yield. The performance of three genotypes, namely, IC 261720, IC 261681 and IC 261736 was identified to be stable using regression analysis and also qualitative and quantitative G x E interaction analysis concept. Six genotypes, EC 365604, IC 261702, IC 310803, EC 383412, IC 261764 and IC 312486 were identified to be instable using both techniques i. e. regression analysis and qualitative and quantitative interaction analysis. The genotype IC 310805 was identified to be stable one using regression analysis, whereas it failed to qualify the stability test of qualitative and quantitative interaction analysis concept. The genotypes IC 241657 and EC 367883 exhibited instability for seed yield using regression analysis techniques, whereas their performance was stable by qualitative and quantitative interaction concept. Thus, genotypes had specific adaptability to the specific environment rather than possessing general adaptation.