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Abstract
Different doses of gamma rays and chemical mutagen have been applied as seed treatment of four plant strains. Seed treatment with 60 Gy gamma irradiation and 0.001 M Na-azide were selected to be used with the two maize strains G4 and Rg11 for further experimentation. Growth parameters and endogenous hormone levels indicated that strain Rg11 is more suitable than G4 under normal irrigation, whereby G4 did better performance under drought stress. The changes at the molecular levels showed variations in the protein banding patterns and the nucleic acid DNA, in response to the applied mutagenic treatments. It has been recommended to cultivate the maize strain G4, in consequence to seed irradiation with 60 Gy gamma rays, for drought resistance