Impacts of Streptomyces lavendulae on the Survival of Pectobacterium atrosepticum, the Causal Agent of Potato Blackleg Disease, in Two Soil Types

The aim of the study was to evaluate the impact of Streptomyces lavendulae HHFA1 (Acc. No. HQ702485) on the extent of survival of the blackleg potato pathogen, Pectobacterium atrosepticum P3 (Acc. No. PQ588453), in sandy and clay soil types, along with characterization of the metabolites secreted by S. lavendulae that may be detrimental for the pathogen. The short term survival of P. atrosepticum was significantly recorded in clay as compared to sandy soils. A significant decrease in the survival of P. atrosepticum was observed in S. lavendulae-treated soil compared to non-treated ones, with a strong evidence on long term survival of the pathogen in sandy soil. Meanwhile, the survival of S. avendulae was higher in sandy compared to clay soils. The most abundant metabolites in S. lavendulae (PQ588453) trials were determined by Gas Chromatography-Mass Spectrometry (GC–MS). The results showed Isochiapin B (39.67%), Octadecenoic acid derivatives (9-Octadecenoic acid (Z)-, methyl ester (Isomers), and 9-Octadecenoic acid (Z)- (9.15%)), 1,2-Benzenedicarboxylic acid and their derivatives (1,2-Benzenedicarboxylic acid, and Benzenedicarboxylic acid butyl octyl ester (7.51%)), Retinoic acid, 5,6-epoxy-5,6-dihydro- (Isomers) (7.03%), 1-Dodecanamine, N,N-dimethyl (5.90%), n-Hexadecanoic acid (4.69%), 1-Chloroeicosane (3.09%) and 1-Tetradecanamine, N,N-dimethyl- (3.04%).In retrospect , it could be concluded that, S. lavendulae may be recommended for controlling soil-borne pathogens similar to P. atrosepticum, especially in sandy soils.