Salinity is a major restriction to crop production in worldwide and breeding for salinity tolerance maybe result in
improving wheat seed yield on saline soils in arid and semi-arid areas agriculture. A population of plants disomic
for 4D/4B recombined chromosomes in the genetic background of T. turgidum was used to investigate the salinity
tolerance of chromosome 4D. Three salt treatments (control, intermediate and high) were applied in and field
condition on 23 wheat recombinant lines. The obtained data were analyzed using a genotype × trait (GT) biplot
method based on site regression model. The biplot method facilitates a visual evaluation of superior lines, traits and
grouping of lines and traits. The GT biplot explained 81% of the total variation of the standardized data. According
to polygon view of biplot there were six vertex lines (3, 18, 165 and 46 and parents Lang. 4D and Capp. 4B). Also
among 23 studied genotypes, lines 3 and 46 had good characteristics regarding high seed yield and salt tolerance.
The biplot vector view indicate that there were a strong positive association between H-Yield and H-Biom (in high
salt treatment), between I-Yield and I-Biom (in intermediate salt treatment), and between C-Yield and C-Biom (in
control salt). In other word, seed yield and biomass of intermediate and high salt treatments were correlated
positively with each other but they do not have any positive correlation with seed yield and biomass of control salt
treatment.
