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BioMed Research International
Volume 2013, Article ID 503805, 10 pages
http://dx.doi.org/10.1155/2013/503805
Research Article

Brazilian Cerrado Soil Actinobacteria Ecology

1Department of Biology, Federal University of Lavras (UFLA), Campus Universitário, 37.200-000 Lavras, MG, Brazil
2Department of Food Science, Federal University of Lavras (UFLA), Campus Universitário, 37.200-000 Lavras, MG, Brazil

Received 15 October 2012; Revised 4 December 2012; Accepted 19 December 2012

Academic Editor: George Tsiamis

Copyright © 2013 Monique Suela Silva et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

A total of 2152 Actinobacteria strains were isolated from native Cerrado (Brazilian Savannah) soils located in Passos, Luminárias, and Arcos municipalities (Minas Gerais State, Brazil). The soils were characterised for chemical and microbiological analysis. The microbial analysis led to the identification of nine genera (Streptomyces, Arthrobacter, Rhodococcus, Amycolatopsis, Microbacterium, Frankia, Leifsonia, Nakamurella, and Kitasatospora) and 92 distinct species in both seasons studied (rainy and dry). The rainy season produced a high microbial population of all the aforementioned genera. The pH values of the soil samples from the Passos, Luminárias, and Arcos regions varied from 4.1 to 5.5. There were no significant differences in the concentrations of phosphorus, magnesium, and organic matter in the soils among the studied areas. Samples from the Arcos area contained large amounts of aluminium in the rainy season and both hydrogen and aluminium in the rainy and dry seasons. The Actinobacteria population seemed to be unaffected by the high levels of aluminium in the soil. Studies are being conducted to produce bioactive compounds from Actinobacteria fermentations on different substrates. The present data suggest that the number and diversity of Actinobacteria spp. in tropical soils represent a vast unexplored resource for the biotechnology of bioactives production.