Soil bacterial communities of Sahara and Gibson deserts: Physiological and taxonomical characteristics

Belov, A.A.; Cheptsov, V.S.; Vorobyova, E.A.

Авторы: Belov Andrey A., Cheptsov Vladimir S., Vorobyova Elena A.
Журнал: AIMS MICROBIOLOGY
Том: 4
Номер: 4
Год издания: 2018
Первая страница: 685
Последняя страница: 710
DOI: 10.3934/microbiol.2018.4.685
Аннотация: The investigation of the Gibson (Australia) and the Sahara (Egypt) Desert soils bacterial communities’ structure and estimation of strain survivability under different environmental factors was the purpose of this research. For the first time, screening of bacterial resistance to wide spectra of principally different stress-conditions was performed. Experiments were conducted with culturable bacterial communities. Strains were identified using 16S rRNA sequencing, and stress-tolerance was estimated by growing strains in various nutrient media. In order to characterize the community, the epifluorescent microscopy and multisubstrate testing were also performed. High bacterial abundance in the desert soils was detected, and there was seen a significant proportion of culturable cells. The close numbers of psychrotolerant and mesophilic bacteria in arid ecosystems were revealed. The representatives of the Actinobacteria phylum were dominate in the microbial communities, besides Firmicutes, Proteobacteria, and Bacteroidetes phyla representatives were identified. Tolerance of the axenic bacterial cultures, isolated from arid desert ecotopes, to temperature, pH, salts (KCl, NaCl, MgSO4, NaHCO3), strong oxidizers (Mg(ClO4)2), and antibiotics (ampicillin, cephalexin, chloramphenicol, tetracycline, doxycycline, kanamycin, rifampicin) was studied. The bacterial isolates were characterized by polyextremotolerance and the ability to maintain metabolic activity in vitro, while influenced by a wide range of physicochemical and biotic factors.
Добавил в систему: Белов Андрей Антонович

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Soil bacterial communities of Sahara and Gibson deserts: Physiological and taxonomical characteristicsстатья

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