Biotechnology of Anoxygenic Phototrophic Bacteria

2016 ◽  
pp. 139-154 ◽  
Author(s):  
Niels-Ulrik Frigaard
Keyword(s):  
Phototrophic Bacteria ◽  
Anoxygenic Phototrophic Bacteria

Anoxygenic phototrophic bacteria of the high-altitude meromictic Lake Gek-Gel, Azerbaijan

Microbiology ◽  
2008 ◽  
Vol 77 (5) ◽  
pp. 602-609 ◽  
Author(s):  
O. N. Lunina ◽  
M. V. Kevbrina ◽  
V. N. Akimov ◽  
N. V. Pimenov
Keyword(s):  
High Altitude ◽  
Phototrophic Bacteria ◽  
Meromictic Lake ◽  
Anoxygenic Phototrophic Bacteria

scholarly journals Abundance and Spatial Distribution of Aerobic Anoxygenic Phototrophic Bacteria in Tama River, Japan

Water ◽  
2020 ◽  
Vol 12 (1) ◽  
pp. 150
Author(s):  
Yuki Sato-Takabe ◽  
Setsuko Hirose ◽  
Tomoyuki Hori ◽  
Satoshi Hanada
Keyword(s):  
Spatial Distribution ◽  
Phototrophic Bacteria ◽  
Anoxygenic Phototrophic Bacteria ◽  
Epifluorescence Microscopy ◽  
Free Living ◽  
Aerobic Anoxygenic Phototrophic Bacteria ◽  
Riverine Environment ◽  
Global Oceans ◽  
Total Bacteria ◽  
Aggregation Form

Aerobic anoxygenic phototrophic bacteria (AAnPB) are widely distributed and regarded as key players driving the carbon cycle in surface water of global oceans, coastal and estuary areas and in other freshwater environments (e.g., ponds and lakes). However, the abundance and spatial distribution of AAnPB in rivers is much less well-known. Here we investigated the variation of the absolute cell abundances of the total bacteria, AAnPB and cyanobacteria, at four different sites in Tama River, Japan, and the spatial distribution (i.e., free-living or particle-attached existence form) of AAnPB at two out of the four sites using infra-red epifluorescence microscopy. Free-living cell abundances for the total bacteria, AAnPB and cyanobacteria were 1.6–3 × 105, 1.5–4.4 × 104 and <3.2 × 104 cells mL−1, respectively. The free-living AAnPB accounted for 6.1%–19.6% of the total bacterial abundance in the river. The peaks of the AAnPB and cyanobacteria abundances were found at the same site, suggesting that the AAnPB could potentially coexist with cyanobacteria. Meanwhile, the particle-attached AAnPB were observed at the two sites of the river, accounting for 52.2% of the total bacteria abundance in the particle. Our results showed the existence and aggregation form of AAnPB in the riverine environment.

scholarly journals Diel changes and diversity of pufM expression in freshwater communities of anoxygenic phototrophic bacteria

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Lívia Kolesár Fecskeová ◽  
Kasia Piwosz ◽  
Martina Hanusová ◽  
Jiří Nedoma ◽  
Petr Znachor ◽  
...  
Keyword(s):  
Phototrophic Bacteria ◽  
Diel Cycle ◽  
Anoxygenic Phototrophic Bacteria ◽  
Individual Species ◽  
The Czech Republic ◽  
Dna And Rna ◽  
Highly Active ◽  
Expression Activity ◽  
Římov Reservoir ◽  
Detailed Picture

AbstractThe anoxygenic phototrophic bacteria (APB) are an active component of aquatic microbial communities. While DNA-based studies have delivered a detailed picture of APB diversity, they cannot provide any information on the activity of individual species. Therefore, we focused on the expression of a photosynthetic gene by APB communities in two freshwater lakes (Cep lake and the Římov Reservoir) in the Czech Republic. First, we analyzed expression levels of pufM during the diel cycle using RT-qPCR. The transcription underwent a strong diel cycle and was inhibited during the day in both lakes. Then, we compared DNA- (total) and RNA-based (active) community composition by sequencing pufM amplicon libraries. We observed large differences in expression activity among different APB phylogroups. While the total APB community in the Římov Reservoir was dominated by Betaproteobacteria, Alphaproteobacteria prevailed in the active library. A different situation was encountered in the oligotrophic lake Cep where Betaproteobacteria (order Burkholderiales) dominated both the DNA and RNA libraries. Interestingly, in Cep lake we found smaller amounts of highly active uncultured phototrophic Chloroflexi, as well as phototrophic Gemmatimonadetes. Despite the large diversity of APB communities, light repression of pufM expression seems to be a common feature of all aerobic APB present in the studied lakes.

Sign in / Sign up

Export Citation Format

Share Document