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Ahstract. The haeterial strahl FLB300 wa.'1 enriched "-ilh 3fluorobenzoate (L~ sole carbon source. Besides bcm:llale all isomeric monofluoro ben7.0ate•s were u tilized. Regiosdoctive 1.2-dioxygenatioo rather than !.6-dioxygt:llation yielded 4fluo rocatechol and minimized the prod ut,;tion of toxi<; 3flunrocateehol. D egradation of 4-fluorot,;alechol was mt:dialed by reactions of onho d ea\'agt: paLhway activities. Chemotaxonomic and r-RNA dala excluded stmin FLB300 from a phylogent:tically defined gen us Ps(!udomonas and suggested its allocation 10 the alpha-2 subclass of Proteo bacleria in a new genus of the. Agrobacterium-Rhizobium branch. Key word!O: 3-Fluorobenzoate-4-Fluorocatechol-Orthop.'lthway-Chemo taxonomy-rRNA analysis-Quinone patlt:rn analys is-Polyamine patlern analY5is Agrobacterium-Rhizobium branch FluoroSllbsrjruted ammal;c compou nds are produced by the plastics, agricultural a nd pharmaceutical industries (Banks 1979, 1982; Filler 1979; \Ve1ch 1987; Gajewski et al. 19RR). Despite their \\.'idespread u se general knowledge of the biochem istry and physiology of these compound~ is rather limited when compared with chlorinated chemicals. Flu orobcnzoatcs hllve f requently beel) used as model compou nds for b.'"IctcriaJ merabousm o f fluOIinated aromatics (Engesser et a l. 19RO; Harper and Blakley 1971 a-c;

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