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Salt stress have negative impact on crop productivity, so plant breeders interested in obtaining improved lines with high productivity and salt stress tolerance. This study conducted in two seasons (2016/2017 & 2017/2018) to study genetic behavior of nineteen lines of durum wheat, obtained from Arab Center for Studies of Arid Zones and Dry Lands (ACSAD), at Ras-Sudr in two experiments, the first irrigated by salinity of 3900 ppm and the second with 6300 ppm. Variation of lines showed high significance for all traits and three lines, ACSADs: 1487, 1566 and 1567, recorded the highest values for grain yield; its components and straw yield/plant. Results of phenotypic correlation between traits showed positive and significant correlation between grain yield/plant and each of straw yield/plant, spike length, number of spikelets/spike, number of grains/spike and 1000 kernel weight, indicating their significant on grain yield under stress. Six lines in the first group of cluster analysis showed positive association with grain yield, its components and all tolerance indices except SSPI, also their high yield under both conditions. The principle component analysis and cluster analysis revealed positive and high significant correlation between plant grain yield under both conditions, indicating high performance under non-stress resulted in relatively to high yield under stress. The same correlation occurred between both grain yield/plant under non-stress and stress with each of: STI, MP, GMP, and HM; but negative and significant correlation with ATI and SSPI indices. Two best lines, ACSADs 1566 and 1567 can be selected as improved ones under salinity. |
