Evaluation of salinity tolerance in wheat recombinant inbred lines using salinity stress tolerance indices

In order to determine response of wheat recombinant inbred lines to salt stress, a study conducted with 319 bread wheat recombinant inbred line (RIL F7) derived from a cross between Roshan cultivar (salt tolerant) and Falat cultivar (salt sensitive), with their parent and 3 check (Arg, Bam and Kavir) were studied in an alpha lattice design with 2 rep and two location (normal and salt affected) in Yazd during 2012. In order to evaluation of inbred lines to salinity tolerance, 8 indices including SSI, TOL, MP, GMP, Harm, STI, SDI and MSTI were calculated based on inbred lines yield in normal and stress environments. Correlation analysis show that MP, TOL, STI and GMP had highest correlation coefficient with seed yield in normal condition, while Harm, MSTI, GMP, STI and MP had highest correlation coefficient with seed yield in stress condition. Principal component analysis for salinity tolerance indices identify two components, first component called yield stability and tolerance to salinity stress, the second component called sensitivity to salt stress and yield potential. MP, GMP and STI were the best indices for identifying superior lines. Using biplot of two first principal components, inbred lines 313, 164, 151, 5, 33, 41, 115, 117, 42, 20, 107 and 132 were identified with high seed yield and salt tolerance.