INSIBIO   05451
INSTITUTO SUPERIOR DE INVESTIGACIONES BIOLOGICAS
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Effect of UV radiation on bacterioplankton community of hypersaline Andean wetland (4,650 m).
Autor/es:
M.R. FLORES, M.V. FERNANDEZ-ZENNOF, O.F. ORDOÑEZ, M.C. ESTEVEZ AND M.E. FARIAS.
Lugar:
Cairns, Australia
Reunión:
Simposio; 12th International Symposium on Microbial Ecology; 2008
Institución organizadora:
International Society for Microbial Ecology (ISME)
Resumen:
The aim of this work was to study the effect of UV radiation (UVR) on bacterioplankton
comunity from Laguna (L.) Vilama an hypersaline wetland (117 g/l) placed at 4,650 m
altitude in the Argentinean northwest andean Puna desert.
UVR expositions of wetland water were carried out in the laboratory during 24 hr. Samples
were extracted at different times for determination of cultivable bacteria, determined by
plating in two media with different salinities and identified by rDNA 16S gene partial
sequence. Total community composition was studied by DGGE profiles with subsequent
sequencing of the bands. In the same way, DNA damage was determinate messuring
Cyclobutane Pyrimidine Dimers (CPDs) accumulation by western blotting.
Among isolated strains under these experimental conditions, Stenotrophomonas
maltophilia, Bacillus cereus, Bacillus sp., Bacterium sp, Vibrio costicola and Halobacillus
profundi were the most resistant bacteria to UVR. Accumulation of CPDs in
bacterioplankton, under artificial radiation, increased from 10 to 900 CPD MB-1 and
reached more than 1200 CPD MB-1 in the beginning of exposition (control made calf
thymus DNA).
DGGE analisys showed the presence of bands that presented high similitude with Gammaproteobacteria
(Halomonas sp., Idiomarinas sp., Marinobacter sp., and PseudoalteromonasPuna desert.
UVR expositions of wetland water were carried out in the laboratory during 24 hr. Samples
were extracted at different times for determination of cultivable bacteria, determined by
plating in two media with different salinities and identified by rDNA 16S gene partial
sequence. Total community composition was studied by DGGE profiles with subsequent
sequencing of the bands. In the same way, DNA damage was determinate messuring
Cyclobutane Pyrimidine Dimers (CPDs) accumulation by western blotting.
Among isolated strains under these experimental conditions, Stenotrophomonas
maltophilia, Bacillus cereus, Bacillus sp., Bacterium sp, Vibrio costicola and Halobacillus
profundi were the most resistant bacteria to UVR. Accumulation of CPDs in
bacterioplankton, under artificial radiation, increased from 10 to 900 CPD MB-1 and
reached more than 1200 CPD MB-1 in the beginning of exposition (control made calf
thymus DNA).
DGGE analisys showed the presence of bands that presented high similitude with Gammaproteobacteria
(Halomonas sp., Idiomarinas sp., Marinobacter sp., and Pseudoalteromonas, Stenotrophomonas
maltophilia, Bacillus cereus, Bacillus sp., Bacterium sp, Vibrio costicola and Halobacillus
profundi were the most resistant bacteria to UVR. Accumulation of CPDs in
bacterioplankton, under artificial radiation, increased from 10 to 900 CPD MB-1 and
reached more than 1200 CPD MB-1 in the beginning of exposition (control made calf
thymus DNA).
DGGE analisys showed the presence of bands that presented high similitude with Gammaproteobacteria
(Halomonas sp., Idiomarinas sp., Marinobacter sp., and Pseudoalteromonasand Halobacillus
profundi were the most resistant bacteria to UVR. Accumulation of CPDs in
bacterioplankton, under artificial radiation, increased from 10 to 900 CPD MB-1 and
reached more than 1200 CPD MB-1 in the beginning of exposition (control made calf
thymus DNA).
DGGE analisys showed the presence of bands that presented high similitude with Gammaproteobacteria
(Halomonas sp., Idiomarinas sp., Marinobacter sp., and Pseudoalteromonaswere the most resistant bacteria to UVR. Accumulation of CPDs in
bacterioplankton, under artificial radiation, increased from 10 to 900 CPD MB-1 and
reached more than 1200 CPD MB-1 in the beginning of exposition (control made calf
thymus DNA).
DGGE analisys showed the presence of bands that presented high similitude with Gammaproteobacteria
(Halomonas sp., Idiomarinas sp., Marinobacter sp., and Pseudoalteromonas-1 and
reached more than 1200 CPD MB-1 in the beginning of exposition (control made calf
thymus DNA).
DGGE analisys showed the presence of bands that presented high similitude with Gammaproteobacteria
(Halomonas sp., Idiomarinas sp., Marinobacter sp., and Pseudoalteromonas-1 in the beginning of exposition (control made calf
thymus DNA).
DGGE analisys showed the presence of bands that presented high similitude with Gammaproteobacteria
(Halomonas sp., Idiomarinas sp., Marinobacter sp., and PseudoalteromonasHalomonas sp., Idiomarinas sp., Marinobacter sp., and Pseudoalteromonas
sp.), Alpha-proteobacteria (Roseobacter sp.), HGC (Agrococcus jenensis) and an
unculturable Bacteroidetes specie. In the same way, bands intensity corresponding to.), Alpha-proteobacteria (Roseobacter sp.), HGC (Agrococcus jenensis) and an
unculturable Bacteroidetes specie. In the same way, bands intensity corresponding to
Idiomonas marina, Marinobacter sp. and Pseudoalteromonas sp. increased during de
radiation treatment.
According to the found results, the high UVR resistance of L. Vilama bacterioplankton
community was related mainly due to the presence of Gammaproteobacterias group., Marinobacter sp. and Pseudoalteromonas sp. increased during de
radiation treatment.
According to the found results, the high UVR resistance of L. Vilama bacterioplankton
community was related mainly due to the presence of Gammaproteobacterias group.