RANK CORRELATIONS AMONG SOME STABILITY PARAMETERS FOR GRAIN YIELD IN BREAD WHEAT

doi:10.12816/ejpb.2020.199310

RANK CORRELATIONS AMONG SOME STABILITY PARAMETERS FOR GRAIN YIELD IN BREAD WHEAT

Document Type : Original research

10.12816/ejpb.2020.199310

Abstract

The present study aimed to evaluate twelve bread wheat genotypes across 9 environments (the combinations of 3 seasons x 3 sowing dates) during 2015/2016, 2016/2017 and 2017/2018 at Kom ombo Agriculture Research Station, Agriculture Research center, Aswan Governorate, Egypt.Significant differences were observed among bread wheat genotypes for grain yield (ton/ha). Combined analysis of variance of grain yield across the nine environments showed a highly significant (p < 0.01) mean squares due to genotypes (G), environments (E) and genotypes x environments interaction (GEI), indicating differential response of genotypes across studied environments and the validity of stability analysis. Six parametric of stability statistics were performed ( , b_i , S²_di , R_i², W_i² and S²_i). Stability analyses for grain yield of wheat genotypes revealed that the genotypes: Line#2, Sakha 95 and Line#1 were more stable than others, expressed in 5, 4, and 3 out of all 6 stability statistics used, respectively. Thus, these genotypes could be suggested to be more stable than others for these measures. They have a low contribution to GEI. Therefore, the above mentioned genotypes could be recommended as stable and/or incorporated in any future breeding programs aiming to produce lines of bread wheat. Rank correlation among stability measures showed that ecovalance (W²_i%) was positively correlated with coefficient of regression (b_i), deviation mean squares from regression (S²_di) and coefficient of determination (R²)

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