ESTIMATION OF GENETIC PARAMETERS AND PATH COEFFICIENT FOR GROWTH TRAITS, YIELD AND ITS COMPONENTS FOR PARENTS AND HYBRID OF MAIZE

Abstract

A field experiment was carried out at the field of Field CropsDepartment, College of Agric., Bagdad Univ. The objectives of experiment wereto estimate the some genetic parameters, phenotypic and genotypic variationcoefficient, genotypic and phenotypic correlation, coheritability, and pathcoefficient for some traits of maize. Five inbred lines of maize (Zea mays L.) wereused (Zm43w (ZE), ZM60, ZM49w, ZM19 and CDCNS) in 2013, for two seasons.On spring season, seeds of inbreds were planted at 17 March. At anthesis fulldiallel cross between inbreds was done. On fall season, F1 seeds of crosses(20cross) resulted from diallel cross and five parents were planted by usingRandomized Completely Block Design with four replications. Results ofstatistical analysis for these crosses and parents were highly significant different.Genetic analysis illustrate that the genetic variation for all traits was more thanenvironment variation. Thus all genetic variation coefficient (GCV) were allclosed of phenotypic variation coefficient (PCV). All values of heritability werehigh. The highest value of coheritability was for number of grains per row withnumber of leaves and leaf area1.071 and 1.044 respectively. All geneticcorrelations were high than phenotypic correlations. The highest value for directeffect was for ear length (0.853). It can be conclude that all traits controlled bygenetic factors and possibility of using ear length and number of grains per rowas selection criteria to improve the grains yield of maize in breeding programs.