Genetic Study of Yield and some Agronomic Traits in Bread Wheat Using Biplot of Diallel Data

To study the genetics of yield and some agronomic traits in bread wheat، the bi-plot of diallel data was used. Parents (Gascogne، Ghods، Gaspard، Pishtaz، Alborz، Toos and Sardari) and their crosses (without reciprocal crosses) were investigated for two cropping seasons (2009- 2010 and 2010- 2011) using a randomized complete block design with three replications in research field of Islamic Azad University، Karaj Branch. Average over years was used for analysis. Analysis of variances indicated significant differences among genotypes for all traits. For evaluation of cultivars genetic potential، the GGE bi-plot graphical method was used. The measured traits were grain yield per plot، spike weight، 1000 kernel weight، fertile tiller number، spike length، awn length، peduncle length and plant height. General and specific combining ability for all traits were significant. Gascogne was the best general combiner and the Gascogne × Gaspard and Ghods × Pishtaz had the highest SCA. These results were confirmed by the biplot analysis. Alvand cultivar was the best tester for 1000 kernel weight. Gaspard and Sardari cultivars were the best testers for grain yield.