Purple non-sulfur photosynthetic bacteria monitor environmental stresses

Mariann Kis, Gábor Sipka, Emese Asztalos, Zsolt Rázga, P. Maróti

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

Heavy metal ion pollution and oxygen deficiency are major environmental risks for microorganisms in aqueous habitat. The potential of purple non-sulfur photosynthetic bacteria for biomonitoring and bioremediation was assessed by investigating the photosynthetic capacity in heavy metal contaminated environments. Cultures of bacterial strains Rhodobacter sphaeroides, Rhodospirillum rubrum and Rubrivivax gelatinosus were treated with heavy metal ions in micromolar (Hg2+), submillimolar (Cr6+) and millimolar (Pb2+) concentration ranges. Functional assays (flash-induced absorption changes and bacteriochlorophyll fluorescence induction) and electron micrographs were taken to specify the harmful effects of pollution and to correlate to morphological changes of the membrane. The bacterial strains and functional tests showed differentiated responses to environmental stresses, revealing that diverse mechanisms of tolerance and/or resistance are involved. The microorganisms were vulnerable to the prompt effect of Pb2+, showed weak tolerance to Hg2+ and proved to be tolerant to Cr6+. The reaction center controlled electron transfer in Rvx. gelatinosus demonstrated the highest degree of resistance against heavy metal exposure.

Original languageEnglish
Pages (from-to)110-117
Number of pages8
JournalJournal of Photochemistry and Photobiology, B: Biology
Volume151
DOIs
Publication statusPublished - Jul 31 2015

Fingerprint

heavy metals
Heavy Metals
bacteria
monitors
Bacteria
Heavy Ions
microorganisms
pollution
metal ions
heavy ions
Electrons
Rhodospirillum rubrum
Bacteriochlorophylls
Rhodobacter sphaeroides
Environmental Biodegradation
habitats
Environmental Monitoring
hypoxia
Ecosystem
flash

Keywords

  • Anaerobism
  • Biomonitoring
  • Bioremediation
  • Fluorescence induction
  • Heavy metal toxicity
  • Purple bacteria

ASJC Scopus subject areas

  • Radiation
  • Radiology Nuclear Medicine and imaging
  • Radiological and Ultrasound Technology
  • Biophysics

Cite this

Purple non-sulfur photosynthetic bacteria monitor environmental stresses. / Kis, Mariann; Sipka, Gábor; Asztalos, Emese; Rázga, Zsolt; Maróti, P.

In: Journal of Photochemistry and Photobiology, B: Biology, Vol. 151, 31.07.2015, p. 110-117.

Research output: Contribution to journalArticle

Kis, Mariann ; Sipka, Gábor ; Asztalos, Emese ; Rázga, Zsolt ; Maróti, P. / Purple non-sulfur photosynthetic bacteria monitor environmental stresses. In: Journal of Photochemistry and Photobiology, B: Biology. 2015 ; Vol. 151. pp. 110-117.
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