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Updated: Aug 7, 2026

Plant-Microbe Interaction: Transcriptional Response of Bacillus Mycoides to Potato Root Exudates
Published on: July 2, 2018
Bacteriocin-like substance inhibits potato soft rot caused by Erwinia carotovora
Florencia Cladera-Olivera1, Geruza R Caron, Amanda S Motta
1Laboratório de Bioquímica e Microbiologia Aplicada, Departamento de Ciência de Alimentos, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil.
Abstract:
Soft rot is a major problem encountered in potatoes during postharvest storage. The soft rot bacterium Erwinia carotovora was inhibited by a novel bacteriocin-like substance (BLS) produced by Bacillus licheniformis P40. The BLS caused a bactericidal effect on E. carotovora cells at 30 microg mL(-1). Transmission electron microscopy showed that BLS-treated cells presented wrinkled bacterial surfaces and shrinkage of the whole cell, indicating plasmolysis. Erwinia carotovora cells treated with BLS were analyzed by FTIR showing differences in the 1390 cm(-1) and 1250-1220 cm(-1) bands, corresponding to assignments of membrane lipids. BLS was effective in preventing E. carotovora spoilage on potato tubers, reducing the symptoms of soft rot at 240 microg mL(-1) and higher concentrations. Soft rot development was completely blocked at 3.7 mg mL(-1). This BLS showed potential to protect potato tubers during storage.
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