On the red coloration of saltern crystallizer ponds

Aharon Oren, Noga Stambler, Zvy Dubinsky

Research output: Contribution to journalArticlepeer-review

26 Scopus citations

Abstract

To assess, respectively, the contribution of red bacteria of the Halobacterium-Haloferax-Haloarcula group and of the β-carotene-rich green alga Dunaliella salina to the red colour of saltern crystallizer ponds, we studied the optical properties of the brines of NaCl-saturated saltern ponds in Eilat, Israel, and quantified the pigments present in their biota. The absorption spectrum of the brines, as measured using the opal glass method to reduce the interference by scattering, or using an integrating sphere, nearly corresponded to the in vivo absorption spectrum of bacterioruberin-containing red archaeobacteria. However, extracts of the microbial community in organic solvents were dominated by β-carotene, a pigment occurring in high concentrations in the Dunaliella cells present, and bacterioruberin contributed only between 13 and 28 per cent of the total visible light absorption by the extracts. The apparent discrepancy between these results can be explained by the very small in vivo optical cross-section of β-carotene, which is densely packed in globules inside the D. salina cells.

Original languageEnglish
Pages (from-to)77-89
Number of pages13
JournalInternational Journal of Salt Lake Research
Volume1
Issue number2
DOIs
StatePublished - 1 Dec 1992
Externally publishedYes

Keywords

  • Dunaliella
  • Halobacterium
  • bacterioruberin
  • solar salterns
  • β-carotene

ASJC Scopus subject areas

  • Agricultural and Biological Sciences (all)

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