Heliophilum fasciatum gen. nov. sp. nov. and Heliobacterium gestii sp. nov.: endospore-forming heliobacteria from rice field soils.
Arch Microbiol
; 165(4): 226-34, 1996 Apr.
Article
em En
| MEDLINE
| ID: mdl-8952943
ABSTRACT
Two new taxa of phototrophic heliobacteria are described Heliobacterium gestii sp. nov. and Heliophilum fasciatum gen. nov. sp. nov. Both organisms were isolated from dry paddy soils. Cells of H. gestii were motile spirilla; cells of H. fasciatum formed cell bundles that were motile as units. Both organisms produced endospores; H. gestii endospores contained dipicolinic acid and elevated levels of calcium. As with other heliobacteria, bacteriochlorophyll g was produced in both organisms and no intracytoplasmic photosynthetic membranes were observed. Growth of H. gestii and H. fasciatum occurred under both photoheterotrophic and chemotrophic conditions; nitrogen fixation also occurred in both organisms. H. gestii and H. fasciatium showed a phylogenetic relationship to the "low GC" line of gram-positive Bacteria, but H. fasciatum was distinct from H. gestii and all other heliobacteria. The ability of H. gestii and H. fasciatum to form endospores might be a significant ecological advantage for survival in their rice soil habitat.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Bactérias
/
Fenômenos Fisiológicos Bacterianos
/
Bactérias Formadoras de Endosporo
Idioma:
En
Revista:
Arch Microbiol
Ano de publicação:
1996
Tipo de documento:
Article
País de afiliação:
Noruega