ناصر صباغ نیا

The objective of this study was to apply the three-dimensional plots of stress selection indices to screen tolerant genotypes of durum wheat. Fourteen genotypes were grown under both drought stress and potential conditions using a randomized complete block design with four replicates. Eight drought tolerance indices were used as well as yield performance under potential (YP) and stress (YS) conditions for drawing three-dimensional plots. Genotypes G1, G4, G5, G6, and G13 were found the most favorable genotypes according to YP, YS and SSI, while genotypes G3 and G8 displayed the highest performance based on STI. Using modified STI indices, K1STI and K2STI did not alter pervious results and produced similar findings. The three-dimensional plots based on average statistics (MP, GMP and HM) as well as YP and YS identified G3 and G8 as the best genotypes, while according to TOL, genotypes G3 and G4 were selected as the most favorable genotypes. Although genotypes performed differently in potential (YP) and stress (YS) conditions, which justifies screening them for both conditions simultaneously, we could find some genotypes which responded good in both conditions like genotypes G3 and G4. Therefore, most of studied indices could discriminate drought tolerant genotypes with high yield using the three-dimensional plots.