Abstract
Maize (Zea mays L.) is the most important and profitable crop in the world. Growth and productivity of maize has been declined recently due to improper nutrient management and unfavorable soil conditions which are contributing in food insecurity. That situation exerts a tremendous pressure on agricultural scientists for substantial increase in food production where plant growth promoting rhizobacteria (PGPR) played their part for enhance the growth of maize via different mechanisms and crop-bacteria specificity. A study was conducted to compare the effect of ACC deaminase (1-aminocyclopropane-1-carboxylate deaminase) producing bacteria two b strains (Bacillus sp. MN54 and Burkholderia phytofirmans PsJN) on germination of inoculated and un-inoculated three genotypes of maize (Arfat, Sunehri and Sultan). The germination was recorded after the 9 days of sowing and seedlings will be harvested after 21 days of sowing. The following parameters will be recorded seed germination rate, seedling growth, length of root, length of shoot, root and shoot ratio, relative growth ratio and plant vigor. In addition, models will be presented to explain the phenotypic response of maize varieties to ACC deaminase producing bacteria inoculation. The genotype named Arfat and its combined treatment with bacterial strains Bacillus sp. MN54 and Burkholderia phytofirmans PsJN performed very well in all parameters. In case of Genotype Sunehri the bacterial strain named Burkholderia phytofirmans PsJN performed high in in all parameters. The third genotype named Sultan was inoculated with bacterial strain Bacillus sp. MN54 performed very strongly in all parameters.
 Keywords: ACC Deaminase, ANOVA, Biplot, Correlation
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