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Abstract  Background The native potatoes ( Solanum tuberosum  subsp.  tuberosum  L.) grown in Chile (Chiloé) represent a new, unexplored source of endophytes to find potential biological control agents for the prevention of bacterial diseases, like blackleg and soft rot, in potato crops. Result The objective of this study was the selection of endophytic actinobacteria from native potatoes for antagonistic activity against  Pectobacterium carotovorum  subsp.  carotovorum  and  Pectobacterium atrosepticum,  and their potential to suppress tissue maceration symptoms in potato tubers. This potential was determined through the quorum quenching activity using a  Chromobacterium violaceaum  ATCC 12472 Wild type (WT) bioassay and its colonization behavior of the potato plant root system ( S. tuberosum ) by means of the Double labeling of oligonucleotide probes for fluorescence in situ hybridization (DOPE-FISH) targeting technique. The results showed that although  Streptomyces  sp. TP199 and  Streptomyces  sp. A2R31 were able to inhibit the growth of the pathogens, only the  Streptomyces  sp. TP199 isolate inhibited  Pectobacterium  sp. growth and diminished tissue maceration in tubers ( p  ≤ 0.05).  Streptomyces  sp. TP199 had metal-dependent acyl homoserine lactones (AHL) quorum quenching activity in vitro and was able to colonize the root endosphere 10 days after inoculation. Conclusions We concluded that native potatoes from southern Chile possess endophyte actinobacteria that are potential agents for the disease management of soft rot and blackleg.

bmc microbiology

Antagonistic activity of endophytic actinobacteria from native potatoes (Solanum tuberosum subsp. tuberosum L.) against Pectobacterium carotovorum subsp. carotovorum and Pectobacterium atrosepticum