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The virulence of numerous Gram-negative bacteria is under the control of a quorum sensing process based on synthesis and perception of  N -acyl homoserine lactones.  Rhodococcus erythropolis , a Gram-positive bacterium, has recently been proposed as a biocontrol agent for plant protection against soft-rot bacteria, including  Pectobacterium . Here, we show that the γ-lactone catabolic pathway of  R. erythropolis  disrupts  Pectobacterium  communication and prevents plant soft-rot. We report the first characterization and demonstration of  N -acyl homoserine lactone quenching  in planta . In particular, we describe the transcription of the  R. erythropolis  lactonase gene, encoding the key enzyme of this pathway, and the subsequent lactone breakdown. The role of this catabolic pathway in biocontrol activity was confirmed by deletion of the lactonase gene from  R. erythropolis  and also its heterologous expression in  Escherichia coli . The γ-lactone catabolic pathway is induced by pathogen communication rather than by pathogen invasion. This is thus a novel and unusual biocontrol pathway, differing from those previously described as protecting plants from phytopathogens. These findings also suggest the existence of an additional pathway contributing to plant protection.

plos one

In Planta Biocontrol of Pectobacterium atrosepticum by Rhodococcus erythropolis Involves Silencing of Pathogen Communication by the Rhodococcal Gamma-Lactone Catabolic Pathway