Total 10 promising genotypes of Brassica juncea L. were evaluated through regression analysis for their stability at five different locations across Punjab province in Pakistan during 2013-14. Combined analysis of variance (ANOVA) depicted highly significant genotype × environment (G × E) interaction (GEI). The average seed yield of thes e five locations, ranged from 1359 to 2 532 kg ha-1. Out of all the tested genotypes, six genotypes produced higher seed yield relative to overall mean value (1930 kgha-1). Highest average seed yield 2532 and 2370 kg ha-1 was recorded at Faisalabad and Khanpur respectively, followed by experimental area of Agronomy Section (1738 kg ha-1). The regression coefficient (bi) of B. juncea genotypes ranged from 0.399 to 1.433. Genotype ZBJ-09007 was the most stable and adapted genotype due to above average performan ce (2204kg ha-1), bi- value nearer to unity (bi = 0.932) and less deviation from regression (S2di = 0.099), therefore, this genotype has broader adaptability and recommended for general cultivation in diverse regions across the Punjab. The genotype s ZBJ-10020 and ZBJ -11030 with significant b value (b>1 *) were considered highly responsive hence suitable for favorable environments with appropriate production practices.
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