مطالعه كاريوتيپي و مورفولوژيكي جمعيتهايي از گياه مرتعي بروموس BROMUS TOMENTELCUS

Twelve populations of Bromus tomentellus which were collected from different parts of the country were studied for various morphologic and karyotypic characteristics. The recorded data were analysed using appropriate model of analysis of variance. Obtaining confident result of differences between the populations for the morphologic and karyotypic characteristics, complementary analysis were performed on the data. The populations were classified for the different karyotypic characteristics and correlations between all combinations of the populations were estimated based on the karyotypic characteristics. Cluster analysis was used to classify the populations based on the morphological and karyotypic characteristics. The least and the most similar populations were identified based on the two sets of the data. A number of statistics were estimated for assymetry assesment of the karyotypes. Regarding the results of analysis of variance on the morphologic data, the populations were significantly different for all of the studied characters. The populations, their chromosomes and their interactions were significantly different for most of the karyotypic attributes. The populations were highly correlated based on the total length of the chromosomes but weak correlations were observed based on the long arm to short arm ratio for some combinations of the populations. Using cluster analysis results, the most distant populations based on the karyotypic characters which may cause infertility in their progenies due to incompatibility were recognized. The most distant populations based on their morphologic characters which may produce enough genetic variation in breeding projects were also identified.