Evaluation of Salt Tolerance Indices in Cotton GenotypesUsing GGE Biplot Method

In order to and compare a group of genotypes and new cotton hybrids were selected through numerous experiments in term of qualital and quantital characteristics, This project conducted in a randomized complete block design with three replications in two areas Hashemabad (non- stress) and Anbaralum (salinity stress) during two years 2013-2014. 38 genotypes were compared with two commercial cultivars of Golestan and Sepid (as control) were evaluated. The measured traits included: Seed cotton yield (1st and 2nd harvest), yield components (boll weight, boll number, length and number of sympodial branches), plant height and earliness (first to total yield ratio). The results of analysis of variance showed that there were significant differences among the genotypes in the years and locations of experimental for the majority of studied traits at a level of 5% or 1%. The highest yield in non-stress condition was shown for Er26, Tj82, Tj135 and DB24 genotypes. But the ranking of treatments was different under stress conditions so that Tj174, Er34 and Tj135 genotypes produced the highest yield under stress conditions. In terms of tolerance index, Er26, Er29 and Tj82 genotypes were superior to other genotypes. Two components drawn in chart determined 94% of the variations by the GGE biplot software. Finally, Tj135, Er38 and Tj82 were selected and introduced as the best and most genotypes for salinity tolerance