Academic journal article Iranian Journal of Public Health

Taxonomic Classification of Newly Isolated Archaeal Strain from Urmia Hypersalin Lake

Academic journal article Iranian Journal of Public Health

Taxonomic Classification of Newly Isolated Archaeal Strain from Urmia Hypersalin Lake

Article excerpt

Background: Urmia Hypersaline Lake which is located in the Northwest of Iran has been explored with great extreme haloarchaeal diversity in recent years. Extreme halophilic Archaea are widely distributed in hypersaline habitats such as salterns and lakes. During the course of biodiversity studies in Urmia Lake, we have isolated several extreme halophilic Archaea some of which could represent as new taxa.

Methods: Among these strains, we chose strain DA50 for further characterization. As our studies demonstrated, this strain showed 16S rRNA gene sequence similarity with Na- trialba aegyptia 40T (92.9%). We also performed some bio- chemical, morphological and physiological tests for afore- mentioned strain according to minimal standards in order to characterize the isolate.

Results: Cells of this strain were pleomorphic. This micro- organism was VP negative, MR positive and catalase positive. Profile of DA50 for acid production, and hydrolize of galac- tose, sucrose, starch, fructose, lactose, ribose, mannitol, glyc- erol, maltose and glucose was analyzed. Furthermore, using these sugars as sole source of carbon in its metabolism has been surveyed. Strain DA50 showed optimum growth at 22 NaCl% (w/v), optimum pH for the strain growth was 7 and optimum temperature for growth was between 40 to 50 °C. …

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