گزینش ژنوتیپ‌های گندم (Triticum aestivum L.) بر اساس پایداری عملکرد و سازگاری

In order to decrease effect of genotype × environment interaction, yield and yield stability should be considered simultaneously. In present study, 24 bread wheat genotypes were evaluated in Gorgan and Gonbad agricultural stations in 2012-13 and 2013-14 cropping seasons. Experiments were conducted based on complete block designs with three replications at 6th December and February. Combined analyses of variance confirmed that the effects of year, location, genotype, year × genotype, location × genotype and year × location × genotype interactions were statistically significant (P<0.99). For determining stable genotypes, non parametric and simultaneous selection of yield and yield stability (Ysi) methods were used. Based on NPi(1)، NPi(2)، NPi(3) and NPi(4) non parametric methods genotypes 2, 9, 24 were selected as high yielding and the most stable genotypes. These genotypes had less than grain yield mean. Results of  Si(1), Si(2) methods showed that genotypes 9 and 17 had the highest stability, while genotypes2 and 8 were also stable genotype in Si(3) and Si(6) methods. According to simultaneous selection for yield and yield stability (Ysi) genotypes 22, 14, 20 and 19 were determined as stable genotypes. These genotypes had grain yield more than grand mean yield. Simultaneous selection for yield and yield stability (Ysi) method selected genotypes with high grain yield and high stability. Finally, results of stability analyses revealed that genotype 22 with mean grain yield of 3932 kg.ha-1 was the most stable genotype.