This study was carried out on nine wheat genotypes. The aforementioned parents were crossed in 9x9 diallel schema excluding reciprocals giving adequate seeds of total thirty-six crosses in 2021/2022 growing season. In 2022/2023 season the nine parents and their resulting 36 F1 crosses were sown on 21th November 2022 at two adjacent experiments. Results indicated that genotypes mean squares were significant for all studied traits under drought and normal irrigation treatment. General and specific combining ability mean squares were highly significant for all studied traits in both environments. The ratios between GCA and SCA exceeded the unity for all studied traits except, spike length and number of spike plant-1. The parental 3 was a good general combiner for no of spikes per plant and grain yield/ plant while parental variety P7 was the best general combiner for plant height, no of kernels per spike and 1000 kernel weight. The highest desirable SCA effects were obtained with P1×P7 for plant height, P1×P5 for no. of spike per plant, P3×P8 for no. of kernels per spike, P6×P7 for 1000 kernel weight, P6×P9 for grain yield under drought stress. The mean squares due to genotypes of (SI) were highly significant SI for most studied traits except spike length. Data indicated that genotypes P5, P6, P1×P5, P2×P4, P2×P5, P3×P4, P3×P7, P3×P9, P4×P7 and P6×P9 had the largest values for STI, YP,YS, MP, GMP and HM. Grain yield under stress conditions (YS) was significantly and positively correlated with STI, MP, GMP, HM, TOL and YI. |
