Identification of Superiorvarieties of Cotton (Gossypiumhirsutum L.) under Drought Stress and normal Conditions using GGEBiplot and GTBiplotmethod in Birjand

The purpose of present study was identifying superior cotton varieties (Gossypiumhirsutum L.) under drought stress and normal conditions using GGEBiplot and GTBiplot. The experiment was conducted in a randomized complete block design with three replications and 14 treatments under normal and stress conditions in the research station of Birjand University in 2013-2014. Cotton genotypes were: Armaghan, Oltan, Bakhtegan, Sahel, Soyecra, Shirpan603, Khordad, Deltapyn25, Mehr, Varamin, N-200, SB35, SP371, 84-39-T3. In evaluation of genotypes among traits using GTBiplot the genotype Deltapine25 was recognized as superior genotype under stress, normal and both normal and stress environments conditions for most traits including yield and yield components. Comparison of genotypes using GGEbiplot based on cotton yield showed that the genotype Deltapine25was also superior cultivar under normal and stress conditions. Based on polygons GGEbiplot, Deltapine25 and Khordad were detected as high performance genotype under both normal and stressenvironments. Also, based no cotton yield GGEbiplot introduced the Deltapine25 as an ideal genotypes.