Genetic Study of Yield and Related Traits in Corn (Zea mays L) Using Graphical Diallel Analysis

In order to study the genetic control of yield and related traits in corn, a diallel mating with 14 inbreed lines were used. Parents and their F1 generations were evaluated, using RCB design with 3 replications (2007) in Karaj seed and plant improvement institute. Hayman & Jinks method were used to data analysis. Variance analysis indicated that additive and non-additive gene effects were important in traits control. According to average degree of dominance over-dominance gene effect observed for yield, ear length and kernel weight per ear and for one hundred kernel weight and ear diameter were partial dominance. Also the increaser alleles for traits were dominant. Broad sense heritability and narrow sense heritability for yield was 0.67 and 0.25 respectively. For other traits broad sense heritability estimated between 0.65 and 0.85, and narrow sense heritability estimated between 0.29 and 0.55.