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Ten mutants of Anabaena PCC7120 were successfully constructed to express two genetic traits, ammonia production and the resistance to the Diuron herbicide, using transposon induced mutagenesis and UV-radiation. The ranges for heterocyst frequency and ammonia production of mutants were 4.2%-6.8% and 2.3-6.6 µmol mg dry wt-1 h-1 respectively. The herbicide-resistance threshold for all mutants was 2.0 mg L-1 , above which the mutants started to decline in health as observed microscopically. Thefatcat:4yqa4kt275ee3mhyk7r7ysyvfm