بررسي تنوع ژنتيكي گونه مرتعي BROMUS TOMENTELIUS با استفاده از روش هاي آماري چند متغيره

Investigation of genetic variation of Bromus tomentellus, using statistical multivariate methods

In order to investigate genetic variation in Bromus tomentellus species twelve genotypes of the species available in forage gene bank which were collected from different parts of the country were surveyed for eleven morphological traits. The data were analysed using RCBD analysis of variance. After confident result of differences between populations for the morphological traits, the genotypes were classified based on the mentioned traits. Correlations between all combinations of genotypes were also estimated. Principal components analysis (P.C.A.) presented two components, containing about 98 percentage of the total existing variation of the data. The two main components were used to produce scatter plot of the populations. Path analysis showed that leaf length, flowering date, and plant vigor were the most important factors affecting plant yield, and had dirrect effects of 1.044, 1.114 and 0.56 respectively. Applying UPGMA method of cluster analysis on the studied attributes, four groups of clusters were obtained. Regarding the morphological characteristics the least and the most similar populations were identified to be used in the future breeding projects.