Response of Bread Wheat Recombinant Inbred Lines to Drought Stress and Their Grouping

In order to study the response of bread wheat recombinant inbred lines to drought stress and their grouping an experiment was conducted in split plot based on randomized complete block design with three replications at Islamic Azad University, Tabriz Branch the Agriculture Research Station. Main factor consist of different levels of irrigation (80, 120 and 160 mm evaporation water from class A evaporation pan) and sub factor included the lines. Result of analysis of variance revealed significant differences among different levels of irrigation for the most of the traits. Mean comparisons showed that drought stress reduced the value of these traits. Significant differences were observed among lines for all the traits except non fertile tiller number. Line × stress interaction was non significant for all of the traits studied. Cluster analysis using WARD algorithm based on the traits under study assigned the lines into two separate groups. Discriminate analysis confirms this grouping. Factor analysis based on principle component analysis and varimax rotation, showed that the first four factors accounted for about 88.69 percent of the total variation. The result revealed that yield and its components and plant height were important traits for selection of promising lines.