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Production of organic acids by bacteria isolated from soil, rhizosphere and mycorrhizosphere of pine (Pinus sylvestris L.).

The bacteria studied released into the medium ten to eleven organic acids. Soil organisms excreted mainly pyruvic and alpha-ketoglutaric acids, while strains from the root zone--gluconic acid and unidentified uronic acid (y2). Mean indices of total production of the organic acids by bacteria were in the following order: rhizosphere less than soil less than mycorrizosphere. Bacteria from the root zone released into the medium very large amounts of pyruvic, gluconic, and uronic (y2) acids--in some instances several times higher than bacterial dry mass.