Assessment of interrelationship between agronomic traits of wheat genotypes under rain-fed conditions using double and triple biplots of genotype, trait and yield

In this study, the methods of genotype × trait (GT) and genotype by yield× trait biplot (GYT) were used to identify interrelationships between different traits and the best wheat genotypes selection based on multiple traits. During the 2017-2018 cropping season, fifteen cultivars/ promising lines along with a durum wheat cultivar, Zahab, were tested on field’s farms at two sites, Delfan and Khorramabad (Imanabad region). The results of ANOVA for the evaluated traits showed significant differences among genotypes for plant height, day to heading and maturity, grain yield and harvest index. According to the mean grain yield of the genotypes at both experimental sites, the maximum grain yield was obtained for Varan, Sadra, Ivan and Azar2/Sabalan/… genotypes with mean grain yield of 3374, 3207.5, 3054 and 2866.5 kg/ha, respectively. Based on GT-Biplot polygon, Varan and Sadra cultivars were displayed high GY, SSM, TKW and PH at two experimental sites. The vector view of GT biplot showed high correlation between grain yield with 1000-kernel weight, plant height and harvest index at experimental sites. Based on results of GYT biplot, Varan and Sadra cultivars were the best genotypes in combining grain yield with all traits evaluated. The high correlations between combinations of 1000-kernel weight and plant height with grain yield were observed, suggesting the importance of these traits in combining with grain yield to increase genotypes productivity.