The present research was conducted to analyze the grain yield and yield components of advanced rain fed wheat genotypes during the farming year 2010-2011 in the Agricultural Researches and Natural Resources Station of Ardebil (one of the coldest areas in Iran). Results indicated that except for total number of tillers and number of fertile tillers, there is a significant difference between the understudy wheat genotypes at 1% or confidence interval of 99% in terms of all evaluated traits. This this could indicate the high genetic diversity among the genotypes for selection of the respective traits. There was a significant difference between the respective genotypes in terms of total plant weight (biomass) at 1%. Mean using Duncan’s method at 5% suggested that the genotype No. 13 had the highest total biomass and was ranked in class A, along with genotypes No. 1, No. 8, and No. 16. Furthermore, grain yields of genotypes varied in the range 3.19 to 5.79 kg per plot. The highest grain yields were reported for genotypes No. 17, No. 13, and No. 3 with 5.79, 5.77, and 5.76 kg/plot, respectively. These genotypes were categorized in class A. The higher yields of these genotypes might result from genetic features of genotype and their capability in transferring larger amount of matters to the plant sink.
