Muhammad Amin, Tila Mohammad, Abdul Jabbar Khan, Muhammad Irfaq, Akhtar Ali, and Ghulam Rasul Tahir

pp. 1147 - 1150

Abstract

Ten promising wheat genotypes were evaluated for grain yield stability under varied environments
at nine locations in the North West Frontier Province, Pakistan. The interaction between genotypes and
environments (G x E) was found significant in this study. None of the regression coefficients (b_i
) was significantly different from variety; therefore, stable performance of the genotypes could not be predicted on ‘b_i’
alone. In this study, deviations from regression (S²
d) and average grain yields were used to identify the
superior genotypes. Above average grain yields were observed in genotypes, CT-99022, SAW-98063, CT99155 and Saleem-2000. Although cultivar Saleem-2000 produced high yield, on the basis of high S²
d value
seemed to be sensitive upon environmental changes. Based on grain yield performance, low deviation from
regression and b_i
 values the genotype CT-99022 is more suitable for favourable and CT-99155 for unfavourable environments. Stable performance was expressed by SAW-98063 because of higher grain yield, regression coefficient (b_i
 = .983) and low deviation from regression (S²
d = 0.065).