Evaluation of Acetobacter spp. as a novel inoculant to improve silage management

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Acetobacter pasteurianus was isolated from bunker-made untreated corn silage as the predominant bacterium. The presence of A. pasteurianus was confirmed by denaturing gradient gel electrophoresis, and in other bunker-made corn silages produced in different regions including Beijing, China. Using the isolate, the effects of A. pasteurianus on fermentation, aerobic stability and bacterial community were determined. Addition of A. pasteurianus before ensiling improved aerobic stability in corn but not in grass and rice silage, whereas addition of A. pasteurianus after silo opening accelerated aerobic spoilage in corn silage. These results indicate that A. pasteurianus can inhabit bunker-made corn silage, and may show significant interactions with other bacterial species associated with anaerobic storage and aerobic deterioration.