ESTIMATION GENE EFFECTS BASED ON JOINT SCALING TEST AND SOME GENETIC PARAMETERS IN FOUR MAIZE CROSSES

Abstract

In order to estimate the components of genetic variation, phenotypic (PCV) ,genotypic(GCV) coefficient of variation, genetic gain and its percentage, an experiment was conducted at the field of Field Crop Dept.College of Agric.-Univ.of Baghdad four crosses (FI01301×Rustico) , (AntignaoHi39× Nostred ) , (Lo1391 ×Rustico) and ( Rusticocangini× Rustico) produced from crossing of genetically different six inbred lines of maize (Zae mays L.). Genetic parameters were estimated according to the Joint scaling test using the randomized complete block design with four replications. The components genetic variance, Additive and dominance of the maize grain and other trait , were estimated. The results showed that the values of chi square was significant for all traits of all crosses, thus the simple additive – dominance model in four crosses exhibited lack of good fit for all traits, indicates the role of non-allelic interaction. Dominance gene action was higher than additive for most traits. Therefore the hybridization would be more effective than population selection to improve these traits for these crosses