Genetic Diversity of some wheat Germplasm Based on Morpho-Phenological Traits

In order to evaluate the yield and some morpho-phenological traits of wheat genotypes and their genetic diversity, 115 wheat genotypes were assessed based on field and laboratory experiments and RCBD design with 3 replications in Gonbad-kavous University in 2015-16. According to the results, there was significant difference between all measured traits except grain length. Though the number of tillers per square meter has positive correlation with the highest grain yield (0.794, p<0.01). Based on the results of step wise regression, the total number of tillers per square meter has been the greatest effect on grain yield. The results of path analysis showed that the highest direct effect on grain yield/m3 was related to the harvest index (0.640) and the total number of tillers per cubic meter had the most indirect effect on grain yield through biological yield (0.458). in addition, 115 wheat genotypes were clustered into two groups which had similarities in terms of genealogy and some measured traits. Therefore, it could be concluded that the harvest index and the number of tillers per m3 are the most suitable indirects selection for improving yield of seeds in screening programs.