Genotype x environment interactions and stability analysis for yield of bread wheat
1997
Kara, S.M. (Karadeniz Technical Univ., Ordu (Turkey). Faculty of Agriculture)
Genotype x environment interaction is of great interest in breeding plant cultivars for variable environments. A number of parameters have been proposed and used in measuring stability of genotypes tested across a range of environments. In this study, the yield data of 12 bread wheat (Triticum aestivum L. subsp. aestivum) genotypes tested over five environments were used to evaluate different stability parameters and rank correlations among them. From the information on mean yield and comparative stability parameters, Kate A.1 was judged as the most stable genotype. The mean yield was significantly correlated only with coefficient of determination (r2i). The linear regression (bi) statistic showed significant positive correlation with r2i, genotype variance (S2i) and coefficient of variability (CVi). The ecovalence stability index (W2i) and stability variance were perfectly correlated (r = 1.00) and the relative rankings of cultivars for the two parameters were exactly the same. The S2i and CVi statistics rank correlated well with each other
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