PROIMI   05436
PLANTA PILOTO DE PROCESOS INDUSTRIALES MICROBIOLOGICOS
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Diversity of iron depositing bacteria in Tierra del Fuego wetlands and their potential of humic substances degradation
Autor/es:
SCHMIDT B; SANCHEZ LA; SIÑERIZ F.; SZEWZYK U.
Lugar:
Leipzig
Reunión:
Congreso; 5th Congress of European Microbiologists -FEMS 2013; 2013
Institución organizadora:
Federation of European Microbiological Societies FEMS
Resumen:
Abstract topic: Metals and microbes Diversity of iron depositing bacteria in Tierra del Fuego wetlands and their potential of humic substances degradation Background: In Tierra del Fuego/Argentina iron rich water bodies, peat bogs and other wet carbon rich soils are common. There, on a small scale contact between aerobic and anaerobic zones leads to an extensive conversion of iron between ferric and ferrous state. Iron depositing bacteria are catalyzing the oxidation side of the iron cycle and were subject of this study. Objectives: Communities of neutrophilic iron bacteria from sampling sites in Tierra del Fuego were analyzed with respect to species composition and their role in cycling of iron and carbon. Of special interest was their capability to degrade high molecular weight organic compounds which are stored in large amounts in humid soils and peat bogs exposed to cold climate. Methods: Samples of microbial mats and biofilms were examined by microscopy and molecular methods. Media for Isolation were developed. Resulting pure cultures were tested for their degradation potential of humic substances. Conclusions: Microscopic examination showed high abundance and broad morphological diversity of iron bacteria. A wide variety of iron bacteria from different phylogenetical groups was isolated. Many of these isolates have not been in pure culture before and are now available for phylogenetic and physiologic studies under laboratory conditions. Some showed the ability to grow on peat extract or humic substances as sole organic carbon source.