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Four atrazine-resistant mutants from the purple bacterium Rhodopseudom onas viridis were isolated. Sequence analysis revealed three different mutant strains carrying mutations in the herbicide-binding pocket: i) M AV 2: L 212-Glu → Lys, ii) M AV 3: L216-Phe → Ser and iii) MAV 4 = MAV 5: L217-Arg → His, L220-Val → Leu. Except M AV 3 all Rps. viridis mutants are different from those selected by their resistance towards the closely related triazine terbutryn.