The effects of ultraviolet radiation on the moderate halophile Halomonas elongata and the extreme halophile Halobacterium salinarum

E. L. Martin, R. L. Reinhardt, L. L. Baum, M. R. Becker, J. J. Shaffer, T. A. Kokjohn

Research output: Contribution to journalArticle

27 Citations (Scopus)

Abstract

Both the moderately halophilic bacterium, Halomonas elongata, and the extremely halophilic archaea, Halobacterium salinarum, can be found in hypersaline environments (e.g., salterns). On complex media, H. elongata grows over a salt range of 0.05-5.2 M, whereas, H. salinarum multiplies over a salt range of 2.5-5.2 M. The purpose of this study was to illustrate the effect that solar (UV-A and UV-B) and germicidal radiation (UV-C) had on the growth patterns of these bacteria at varied salt concentrations. Halomonas elongata grown on a complex medium at 0.05, 1.37, and 4.3 M NaCl was found to be more sensitive to UV-A and UV-B radiation, as the salt concentration of the medium increased. Halobacterium salinarum grown on a complex medium at 3.0 and 4.3 M NaCl did not show a significant drop in viability after 39.3 kJ·m-2 of UV-A and UV-B exposure. When exposed to UV-C, H. elongata exhibited substantially more sensitivity than H. salinarum. In H. elongata, differential sensitivity to UV-C was observed. At 0.05 M NaCl, H. elongata was less sensitive to UV-C than at 1.37 and 4.3 M NaCl. Both bacteria showed some photoreactivation when incubated under visible light following both UV- A, UV-B, and UV-C exposure. Mutagenesis following UV-C exposure was demonstrated by both organisms.

Original languageEnglish (US)
Pages (from-to)180-187
Number of pages8
JournalCanadian journal of microbiology
Volume46
Issue number2
StatePublished - Mar 13 2000

Fingerprint

Halobacteriales
Halomonas
Halobacterium salinarum
Radiation Effects
Ultraviolet radiation
Salts
Bacteria
Mutagenesis
Radiation
Archaea
Light
Growth

Keywords

  • Extreme halophile
  • Germicidal UV
  • Halobacterium
  • Halomonas
  • Moderate halophile
  • Mutagenesis
  • Solar UV

ASJC Scopus subject areas

  • Microbiology
  • Immunology
  • Applied Microbiology and Biotechnology
  • Molecular Biology
  • Genetics

Cite this

The effects of ultraviolet radiation on the moderate halophile Halomonas elongata and the extreme halophile Halobacterium salinarum. / Martin, E. L.; Reinhardt, R. L.; Baum, L. L.; Becker, M. R.; Shaffer, J. J.; Kokjohn, T. A.

In: Canadian journal of microbiology, Vol. 46, No. 2, 13.03.2000, p. 180-187.

Research output: Contribution to journalArticle

Martin, E. L. ; Reinhardt, R. L. ; Baum, L. L. ; Becker, M. R. ; Shaffer, J. J. ; Kokjohn, T. A. / The effects of ultraviolet radiation on the moderate halophile Halomonas elongata and the extreme halophile Halobacterium salinarum. In: Canadian journal of microbiology. 2000 ; Vol. 46, No. 2. pp. 180-187.
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