Authentication and characterization of a candidate antagonistic bacterium against soft rot of Amorphophallus konjac

► The Serratia marcescens restraining the bacterial soft rot of konjac was firstly reported. ► The active substances of the Serratia marcescens were firstly analysed by HPLC-MS. ► The Serratia marcescens was obtained from the tissue of the edge of the ill and heath.