[Rhodobaca barguzinensis sp. nov., a new alkaliphilic purple nonsulfur bacterium isolated from a soda lake of the Barguzin Valley (Buryat Republic, eastern Siberia)].
A novel strain, alga-05, of alkaliphilic purple nonsulfur bacteria was isolated from sediments of a small saline (60 g/l) soda lake near Lake Algin (Barguzin Valley, Buryat Republic, Russia). These bacteria contain bacteriochlorophyll a and carotenoids of the alternative spirilloxanthin group with predominating demethylspheroidenone. They are facultative anaerobes; their photosynthetic structures are of the vesicular type and arranged along the cell periphery. Growth of this strain is possible in a salinity range of 5-80 g/l NaCl, with an optimum at 20 g/l NaCl. Best growth occurred at 20-35 degrees C. Analysis of the 16S rRNA gene sequences demonstrated that the studied isolate is closely related to the alkaliphilic purple nonsulfur bacterium Rhodobaca bogoriensis (99% similarity) isolated from soda lakes of the African Rift Zone. According to the results of DNA-DNA hybridization, strain alga-05 has a 52% similarity with the type species of the genus Rhodobaca. On the basis of the obtained genotypic data and some phenotypic properties (dwelling in a hypersaline soda lake of Siberia, moderate halophily, ability to grow at relatively low temperatures, etc.), the isolated strain of purple bacteria was described as a new species of the genus Rhodobaca, Rca. barguzinensis sp. nov.
Boldareva
E N
EN
Akimov
V N
VN
Boĭchenko
V A
VA
Stadnichuk
I N
IN
Moskalenko
A A
AA
Makhneva
Z K
ZK
Gorlenko
V M
VM
D000693:Anaerobiosis; D025541:Bacteriochlorophyll A / Q000302:isolation & purification; D002338:Carotenoids / Q000302:isolation & purification; D003470:Culture Media; D005618:Fresh Water / Q000382:microbiology; D019015:Geologic Sediments / Q000382:microbiology; D012329:RNA, Bacterial / Q000235:genetics; D012336:RNA, Ribosomal, 16S / Q000235:genetics; D016992:Rhodobacter / Q000737:chemistry / Q000145:classification / Q000166:cytology / Q000302:isolation & purification* / Q000502:physiology; D017385:Sequence Homology; D012800:Siberia; D012965:Sodium Chloride; D014871:Water Microbiology
D025541:Bacteriochlorophyll A; D003470:Culture Media; D012329:RNA, Bacterial; D012336:RNA, Ribosomal, 16S; D002338:Carotenoids; D012965:Sodium Chloride