Soil drying as a model for the action of stress factors on the natural bacterial population

The drying of soil samples reduced the abundance (especially of predominant species) and the diversity of bacteria isolated from these samples, making easier the isolation of rare bacterial species. Some bacterial species that were minor before soil drying became dominant in dried soil samples. In g...

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Bibliographic Details
Published in:	Mikrobiologija (Moskva. 1932) Vol. 72; no. 6; p. 854
Main Authors:	Rokitko, P V, Romanovskaia, V A, Malashenko, Iu R, Chernaia, N A, Gushcha, N I, Mikheev, A N
Format:	Journal Article
Language:	Russian
Published:	Russia (Federation) 01-11-2003
Subjects:	Bacteria - isolation & purification Bacteria - radiation effects Bacterial Physiological Phenomena Desiccation Gamma Rays Soil Microbiology Species Specificity
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Summary:	The drying of soil samples reduced the abundance (especially of predominant species) and the diversity of bacteria isolated from these samples, making easier the isolation of rare bacterial species. Some bacterial species that were minor before soil drying became dominant in dried soil samples. In general, soil drying allowed the diversity of soil bacteria to be determined more adequately. The bacteria that were isolated from dried soil samples turned out to be resistant to gamma radiation (with LD90 = 2.8-4.6 kGy) and desiccation. It is concluded that soil drying may serve as a model for the action of stress factors on natural bacterial populations. The hypothesis that periodic desiccation was the primary cause of formation of bacterial radioresistance in nature is discussed.
ISSN:	0026-3656