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.