Study of morphological traits and genetic variation in different genotypes of upland cotton (gossypium hirsutum) in Iran

In order to study the genetic variation in upland cotton genotypes, 35 genotyes were evaluated in Hashemabad Cotton Research Station of Gorgan in 1997 and 1998. Genotypes showed high variation for morphological and quantitative traits, as 12 traits in 1997 an 11 traits in 1998 were found significant. Two years results also showed significant differences among the genotypes Varamin had the highest and the lowest yields, respectively. For earliness, cultivars Shirpan 603 and 539, Beli Izvor and strain No. 254 were evaluated as early, and Sahel and Varamin as late varieties. Clustering of genotypes were done by cluster analysis and principal component analysis (PCA) methods. Both methods showed the same results for clustering of the genotypes in four groups. It is clear that distant groups would be shown more heterosis in hibridization proceedures.