Analysis of the diversity of diazotrophic bacteria in peat soil by cloning of the nifH gene View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

2009-04

AUTHORS

E. V. Zadorina, N. V. Slobodova, E. S. Boulygina, T. V. Kolganova, I. K. Kravchenko, B. B. Kuznetsov

ABSTRACT

The diversity of nitrogen-fixing microorganisms in the soil of an oligotrophic Sphagnum peat bog was studied by molecular cloning of fragments of the nifH gene encoding one of the main components of the nitrogenase complex. The fragments were amplified from the DNA isolated from the peat samples collected at the same site in January (library I) and November (library II), 2005. Analysis of the nifH sequence libraries revealed high diversity of diazotrophic bacteria in peat soil: the first library consisted of 237 clones and 55 unique sequence types, the second one included 171 clones and 52 sequence types. Comparison of the two clone libraries showed that the composition and population structure of the nitrogen-fixing community depended greatly on the sampling time; they shared only 11 phylotypes. The sequences of representatives of the class Alphaproteobacteria prevailed in both libraries (27% and 57% of clones in libraries I and II, respectively). Representatives of the classes Deltaproteobacteria and Chlorobea were minor components of library I (6% and 7% of clones, respectively), whereas they prevailed in library II (18% and 24% of clones, respectively). Members of the class Chloroflexi were present only in library I, while members of the classes Bacilli, Clostridia, and Methanomicrobia were present only in library II. Our studies demonstrated that, for complete evaluation of the diversity of natural nitrogen-fixing communities, nifH libraries should consist of at least 200–300 clones. More... »

PAGES

218-226

References to SciGraph publications

Identifiers

URI

http://scigraph.springernature.com/pub.10.1134/s0026261709020131

DOI

http://dx.doi.org/10.1134/s0026261709020131

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1008480435


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