مطالعه سيتوژنتيكي برخي از گونه هاي آگروپايرون در ايران

Agropyron is one of the most resistant plant to biotic and abiotic stresses. It has important role to produce forage yield in rangelands. In a breeding program of agropyron species, cytogenetic study involving karyotypic analysis of different genotypes were carried out. In karyotypic analysis 17 agropyron genotypes of 11 species collected from different part of Iran were studied. The karyotypic characters including long arm length (L), short arm length(S), satellite present, total chromosome length (TL), L/S and S/L, percentage form (TF), chromatin length and class form of chromosome were determind. In this experiment 2 genotypes (Agropyron libaniticus and Agropyron intermedium) were diploid (2n = 2x = 14), 9 genotypes were tetraploid (2n-4x = 27), 3 genotypes were hexaploid (2n = 6x = 42) and 3 genotypes were octaploid. Cluster analysis of tetraploid genotypes based on the karyotypic characters classified the genotypes into 4 clusters. According to principal component analysis the chromosomes 7, 6, 9, 5 and 8 had most variation, respectively.