GT biplot analysis for yield and related traits in some sunflower (Helianthus annuus L.) genotypes

Abstract

In order to investigate the genotype-trait interaction in the form of a randomized complete block design (RCBD) on ten sunflower genotypes in four regions of Karaj, Birjand, Firoozabad and Arak in the cropping years 2018–2019. The results of combined analysis of variance at the probability level of 0.01 showed that the genotypes were significantly different in terms of the studied traits. The effect of genotype × environment was also significantly different in all traits except plant height, leaf width and grain yield. Genotype × year × environment was also significant in all traits except plant height and stem diameter. The results of comparison of the mean by Duncan method also identified Azargol, Zaria and Armaverski genotypes as genotypes with favorable rank. Armaverski and Azargol genotypes were identified as desirable genotypes in all studied regions in the study of polygon diagrams. Genotype ranking chart based on ideal genotype also introduced Zargol and Azargol genotypes as genotypes with suitable yield and desirability. The grouping diagram of genotypes in terms of traits also grouped the studied genotypes in Karaj, Birjand and Firoozabad regions into four groups in terms of traits and the studied genotypes in Arak region into three groups. • The genotype × trait (GT biplot) interaction was one of the GGE biplot methods to study genotype – trait interaction data. • GT biplot is an appropriate tool for identifying cultivars and trait interactions. • An experiment was conducted to investigate the interaction of genotype and trait on ten sunflower genotypes in four regions of Karaj, Birjand, Firoozabad and Arak in two cropping years. • The effect of genotype × environment was also significant. Genotype × year × environment was also significant.