Adaptation and Stability Analysis in Some Bread Wheat Genotypes

Authors : Şevket Metin KARA

Pages : 413-420

View : 13 | Download : 11

Publication Date : 2000-06-01

Article Type : Research Paper

Abstract :Genotype x environment interaction is a challenging issue to plant breeders in improving high-yielding, stable genotypes for variable environments. Several methods of measuring stability of genotypes tested across a range of environments have been proposed. The grain yields of fifteen bread wheat insert ignore into journalissuearticles values( Triticum aestivumL.); genotypes grown at eight different locations were used to assess adaptation and stability characteristics of the genotypes and to study associations among these parameters. According to most of the parameters used in the present study, Kiraç 66, Es-kbvd-15 and Ank-92-1 appeared to have a good level of general adaptation to all environments. Mean yield was highly correlated with S i 2 , b i , b i , and a i . The regression coefficients b i , b i , and a i were perfectly rank correlated insert ignore into journalissuearticles values(r=1.00); with each other as well as with S i 2 and CV i . Eberhart and Russell`s Sd i 2 statistic was highly associated insert ignore into journalissuearticles values(r=0.93**); with Tai`s l i . The stability statistics S i insert ignore into journalissuearticles values(2); and S i insert ignore into journalissuearticles values(3); of Hühn showed a good rank correlation with CV i , W i 2 , and Sd i 2 . The statistics based on the ranks of genotypes over environments, such as S i insert ignore into journalissuearticles values(2); and S i insert ignore into journalissuearticles values(3); , would be a potential alternative to the parametric approaches currently used.
Keywords : Bread Wheat, Triticum aestivum L, Genotype x Environment Interaction, Adaptation, Stability parameters