Journal
EURASIAN SOIL SCIENCE
Volume 48, Issue 3, Pages 268-275Publisher
MAIK NAUKA/INTERPERIODICA/SPRINGER
DOI: 10.1134/S1064229315030035
Keywords
intestines; symbionts; enzyme activity; humic acids; decomposition; stimulation of growth
Categories
Funding
- Russian Foundation for Basic Research [11-04-00580a, 12-04-01652a, 12-04-31720 mol_a]
- Russian Federation [MK-5939.2013.4]
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Several hundred bacterial strains belonging to different taxa were isolated and identified from the digestive tracts of soil and compost earthworms. Some physiological and biochemical properties of the bacteria were characterized. The majority of intestinal bacteria in the earthworms were found to be facultative anaerobes. The intestinal isolates as compared to the soil ones had elevated activity of proteases and dehydrogenases. In addition, bacteria associated with earthworms' intestines are capable of growth on humic acids as a sole carbon source. Humic acid stimulated the growth of the intestinal bacteria to a greater extent than those of the soil ones. In the digestive tracts, polyphenol oxidase activity was found. Along with the data on the taxonomic separation of the intestinal bacteria, the features described testified to the presence of a group of bacteria in the earthworms intestines that is functionally characteristic and is different from the soil bacteria.
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