Abstract

This study was carried out in order to investigate the genetic structure of the twenty-eight maize hybrids established from eight maize inbred lines. The seed of the F₁ population along with their parents were planted in Iran in 2008, using RCBD with three replications. Estimation of gene effects and some of the genetic parameters and graphic plot drawing of Hayman-Jinks method were accomplished. Statistics a and b for all traits was significant. Considering the average degree of dominance, as well as the Hayman graphical plot, dominance effects were observed for grain yield and plant growth period traits over dominance, complete dominance for grain diameter and additive gene action with partial dominance for ASI, grain filling period, grain number in row, grain number in ear, grain row number in ear, ear diameter, grain depth, 1000 grain weight and hektolitr weight traits.

Key words: Maize, genetic parameters, graphic plot