فهرست مطالب m. khodambashi emami

Half diallel crosses of nine Iranian wheat cultivars were used for graphical analysis and estimation of genetic parameters related to yield and its components. Parents with F2 generations were evaluated in a randomized complete blocks design with three replications. The analysis of variance revealed significant differences among genotypes for all traits except tiller number and grain weight per main spike. The test of Jinks and Hayman revealed that assumptions are valid for flag leaf length, plant height, grain yield per plant, main spike length and peduncle length, but for flag leaf width and peduncle weigth when one parent was excluded, the assumptions were fulfiled. According to the estimations of average degree of dominance and results of graphical analysis, the gene actions for flag leaf length, flag leaf width, plant height, grain yield per plant, main spike length, peduncle length and peduncle weight were partial dominance

Half diallel crosses of nine Iranian wheat cultivars were used to estimate the general and specific combining ability effects and other genetic parameters related to yield and its components. Parents with F2 generations were evaluated at Research Farm, College of Agriculture, University of Shahrekord, in a randomized complete block design with 3 replications. Partitioning of genotypes mean squares to GCA and SCA mean squares based on Griffing’s method 2 and mixed model indicated high significant differences among cultivars in their GCA values for all traits. There were significant differences among crosses in their SCA values for all traits except for flag leaf length, main spike length, plant height and grain yield per plant. The high ratio of GCA to SCA mean squares implied the importance of additive gene effects in the appearance of flag leaf length , main spike length, plant height and grain yield per plant. For flag leaf width, grain number per main spike and peduncle length , the contributions of additive gene effects and for peduncle weight, the contributions of non- additive gene effects were higher. According to the estimates of average degree of dominance, the gene actions for flag leaf length, flag leaf width, plant height, grain yield per plant, main spike length, peduncle length and peduncle weight were partial dominance. The GCA effects indicated that Sefid – Aliabad cultivar was the suitable general combiner for flag leaf length , flag leaf width, plant height , grain yield per plant , main spike length and peduncle length.