PJB-2003-25
SELECTION OF STABLE RAPESEED (BRASSICA NAPUS L.) GENOTYPES THROUGH REGRESSION ANALYSIS
NAAZAR ALI, FARZAD JAVIDFAR* AND M. Y. MIRZA
Abstract
Twenty-five elite genotypes of winter rapeseed were evaluated through regression analysis for their phenotypic stability in seven cold and six mild cold regions of Iran. Sufficient GE interaction was exhibited by the genotypes for seed yield which is pre-requisite to regression and stability analysis Across the 13 environments, Alice and Olera genotypes were at par and produced 3.40 t/ha. Thirteen genotypes showed above average mean performance. Erumia (cold) and Islamabad (mild cold) regions with yield of 4.35 t/ha were found suitable for this germplasm. Both linear as well non-linear components of GE interaction were significant and reflected the differential response of the tested genotypes to different environmental changes. Regression coefficients ranged from 0.29 to 1.35 in Syn-1 and DP-94-8 respectively. Four genotypes (Symbol, Fornax, Parade and Okapi) had b-values close to unity with average performance and low deviation from regression (S2d), and were suitable for wider range of environments. Orient, Cocktail, Alice, Olera, Reg x Cob and SML-046 were found suitable for favourable environments due to their regression coefficients greater than unity, above average performance and low S2d. Due to below average response (b
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