Stability parameters for opium and seed yield in opium poppy (Papaver somniferum)

Abstract

An experiment was conducted during 1995-96 to 1998-99 to evaluate 10 varieties for stability parameters for opium yield, seed yield and morphine content in opium poppy (Papaver somniferum L.). The varieties showed significant differences for all the traits. Joint regression analysis indicated that both predictable and unpredictable components contributed significantly towards the difference in stability of genotypes. However, larger variation in regression coefficients revealed that genotypes had different degree of environmental response. Genotypes studied did not show uniform stability (s² _di) and response (linear) for all the characters. The genotypes 'NBRI 9', 'NBRI 10' and 'BROP 1' were more stable and responsive than other over environment for all 3 traits. The mean performance was found associated with linear (S² _di) component with mean (X) and regression (bi) was noticed.