Genetic study of some morphophysiological traits in bread wheat lines under dryland conditions using diallel crossing

To study genetic of some characters in bread wheat lines under dryland conditions, a diallel crossing design was conducted. Six lines were crossed unilaterally in spring of 2001. In the following year, parents and F1s were evaluated in RCB design with three replications in the Agricultural Research Field of Lorestan University. Plant height, heading date, leaf angle, leaf rolling, chlorophyll fluorescence, flag leaf length, awn length, plant biomass weight, number of seed per spike and spike harvest index were measured. Analysis of variance showed significant differences for all characters except for number of seed per spike and spike harvest index. Data were analyzed by Griffing (method II and model II) and Hayman's methods (Morley and lones method). General combining ability (GCA) was significant for all characters except for chlorophyll fluorescence. Specific combining ability (SCA) was also significant for all characters except for plant height, awn length and plant biomass weight. In general, genes additive effects revealed the effectiveness of selection for plant height. Additive and non additive effects together were effective for selection in segregating population for heading date, leaf rolling, flag leaf length and awn length. Finally non-additive effects were effective for chlorophyll fluorescence and leaf angle