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    STUDIA BIOLOGIA - Issue no. 1 / 2019  

  Abstract:   Halophilic archaea within the class Halobacteria are known to be drought- and ultraviolet irradiation-resistant. Moreover, in recent years numerous haloarchaea have been noted as polyextremophiles. Among these, Halobacterium salinarum NRC-1 was reported to be resistant to ultraviolet light and radiation. Ultraviolet light is classified into three types according to their wavelength: the long-wavelength, poorly-penetrating UV-A, the mid-wavelength UV-B that indirectly inflict the damage of intracellular components and the short-wavelength UV-C that directly incurs DNA damage (Jones & Baxter, 2017). Studies on the strain NRC-1 have led to the elucidation of several UV resistance mechanisms, but it was not clear whether many of them are clearly associated with resistance. In this study, we isolated 8 halophilic strains capable of growing under UV light irradiation from 810 different kinds of commercially available salt samples. The 16S rRNA gene sequence analysis revealed that the isolates were closely related to the genus Halobacterium, Halorubrum, Haloterrigena, and Haloparvum, respectively. During the log phase cultivation, these strains were UV-irradiated for 60 seconds. Our results suggested that the tested haloarchaeal isolates were equally or even more UV-resistant than the standard Halobacterium NRC-1 strain.

Keywords: haloarchaea, ultraviolet light, ultraviolet resistant.
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