Parametric and non-parametric stability analyses for grain yield of bread wheat (Triticum aestivum l) genotypes in Kahramanmaraş conditions of Turkey

Grain yield of 11 bread wheat genotypes, tested in a randomised complete block design with 3 replications over 6 years under Kahramanmaraş conditions was analysed by using seven parametric and 2 non-parametric stability criteria. The objectives were to assess genotype by environment interactions and to determine stable genotypes. The fallowing nine stability statistics were calculated: Eberhart and Russell's (1966) regression coefficient (bjj and deviation from regression (S2di), Pinthus's (1973) coefficients of determination (R2), Francis and Kannenberg's (1978) coefficient of variability and genotypic variance (S2I), Tai's (1971) environmental effects (OI) and deviation from the linear response (A-I), Nassar and Huehn's (1987) ranks over environments (S/2)), mean of absolute rank differences (S/! )). Furthermore, three-dimensional plots of mean response versus each parametric stability statistic and two-dimensional plots of mean grain yield versus non-parametric stability statistics were shown to visually evaluate the yield potential and stability estimates of the genotypes. According to these stability parameters genotype 2 (URES/BOW'S") was the most stable genotype for grain yield.

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