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Screening for violacein production using C. violaceum CV026 cross streaking. E. carotovora GS101 and E. carotovora PNP22 were used as positive and negative controls, respectively. (a) Observation of purple pigment formation on the biosensor streak line indicates the production of exogenous short chained AHL molecules by the E. asburiae (L1) isolate; negative purple pigmentation for L2 isolate and (b) both L3 and L4 isolates indicate no AHL production from these isolates.
