Haloarcula

Haloarcula
Scientific classification
Domain: Archaea
Kingdom: Euryarchaeota
Phylum: Euryarchaeota
Class: Halobacteria
Order: Halobacteriales
Family: Halobacteriaceae
Genus: Haloarcula
Binomial name
Haloarcula
Torreblanca et al. 1986
Species
  • H. amylolytica
  • H. argentinensis
  • H. hispanica
  • H. japonica
  • H. marismortui
  • H. quadrata
  • H. vallismortis

In taxonomy, Haloarcula is a genus of the Halobacteriaceae.

Description and significance

Haloarcula are extreme halophilic archaeons. They are distinguished from other genera in the Halobacteriaceae family by the presence of specific derivatives of TGD-2 polar lipids. There are currently seven recognized species 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. Haloarcula quadrata, has predominantly flat, square-shaped, somewhat pleomorphic cells.[1]

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

Ecology

Haloarcula are found in neutral saline environments like salt lakes, marine salterns, and saline soils. Like other members of the Halobacteriaceae family, Haloarcula require at least 1.5 M NaCl for growth, but grow optimally in 2.0 to 4.5 M NaCl.[2]

References

  1. ↑ 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. doi:10.1099/00207713-49-3-1149.
  2. ↑ See the NCBI webpage on Haloarcula. Data extracted from the "NCBI taxonomy resources". National Center for Biotechnology Information. Retrieved 2007-03-19.

Further reading

Scientific journals

Scientific databases

External links


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