Haloarcula

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Haloarcula
Scientific classification
Domain: Archaea
Kingdom: Euryarchaeota
Phylum: Euryarchaeota
Class: Halobacteria
Order: Halobacteriales
Family: Halobacteriaceae
Genus: Haloarcula
Torreblanca et al. 1986 emend. Oren et al. 2009[1]
Species

In taxonomy, Haloarcula is a genus of the Halobacteriaceae.

Description and significance[edit]

Haloarcula species are extreme halophilic archaea. They are distinguished from other genera in the Halobacteriaceae family by the presence of specific derivatives of TGD-2 polar lipids. Currently, seven recognized species are in the genus: H. vallismortis, H. marismortui, H. hispanica, H. japonica, H. argentinensis, H. mukohataei, and H. quadrata. H. quadrata was first isolated when researchers were attempting to culture Haloquadratum walsbyi, a haloarchaeon that was thought to be unculturable until 2004. H. quadrata has predominantly flat, square-shaped, somewhat pleomorphic cells.[2]

Haloarcula species grow optimally at 40–45 °C. Growth appears in sheets of up to 65 cells often in the shape of a square or triangle.

Ecology[edit]

Haloarcula species are found in neutral saline environments such as salt lakes, marine salterns, and saline soils. Like other members of the Halobacteriaceae family, Haloarcula requires at least 1.5 M NaCl for growth, but grow optimally in 2.0 to 4.5 M NaCl.[1]

References[edit]

  1. ^ a b See the NCBI webpage on Haloarcula. Data extracted from the "NCBI taxonomy resources". National Center for Biotechnology Information. Retrieved 2007-03-19. 
  2. ^ Oren, A.; Ventosa, A.; Gutierrez, M. C.; Kamekura, M. (1999). "Haloarcula quadrata sp. nov., a square, motile archaeon isolated from a brine pool in Sinai (Egypt)". International Journal of Systematic Bacteriology. 49 (3): 1149–1155. doi:10.1099/00207713-49-3-1149. PMID 10425773. 

Further reading[edit]

  • Torreblanca M, Rodriquez-Valera F, Juez G, Ventosa A, Kamekura M, Kates M (1986). "Classification of non-alkaliphilic halobacteria based on numerical taxonomy and polar lipid composition, and description of Haloarcula gen. nov. and Haloferax gen.nov". Syst. Appl. Microbiol. 8: 89–99. doi:10.1016/s0723-2020(86)80155-2. 
  • Oren A, Ventosa A (2000). "International Committee on Systematic Bacteriology Subcommittee on the taxonomy of Halobacteriaceae. Minutes of the meetings, 16 August 1999, Sydney, Australia". Int. J. Syst. Evol. Microbiol. 50: 1405–1407. PMID 10843089. 
  • Javor B, Requadt C, Stoeckenius W (1982). "Box-shaped halophilic bacteria". J. Bacteriol. 151 (3): 1532–1542. PMC 220435Freely accessible. PMID 6286602. 

External links[edit]