Tolerance of cyanobacteria to the toxicity of BDE-47 and their removal ability

Annie Chalifour, Nora Fung Yee Tam

Research output: Contribution to journalArticlepeer-review

18 Citations (Scopus)

Abstract

Polybrominated diphenyl ethers are ubiquitous and toxic contaminants in aquatic environments. The effect of polybrominated diphenyl ether BDE-47 on five species of cyanobacteria, along with their removal ability was investigated. Four species, namely Synechocystis sp., Oscillatoria planctonica, Microcystis flos-aquae and Nostoc sp., were exposed to BDE-47 at concentrations ranging from 0.05 to 1.0 mg L−1 for 14 days, while the exposure time for Pseudanabaena sp. was 30 days. The first four species were very tolerant to BDE-47 while growth and photosynthesis of Pseudanabaena were significantly inhibited by BDE-47 at concentrations over 0.1 mg L−1. However, this species could recover from the toxicity of high concentrations of BDE-47 after 30 days of exposure, indicating the development of some “resistance” after pre-exposure to 1.0 mg L−1 BDE-47. The “resistant” cells had a higher growth rate, photosynthesis and glutathione S-transferase activity than normal Pseudanabaena cells. The sensitivity of Pseudanabaena to BDE-47 toxicity was affected by its initial filament density, with cultures having a low filament density (2.3 × 106 filaments mL−1) being up to 14–15 times more sensitive than cultures with a high filament density (13 × 106 filaments mL−1). All cyanobacteria could remove 70–82% of BDE-47 in their media, with more than 60% of BDE-47 accumulated in cells. This is the first study showing the high tolerance of different cyanobacteria species to BDE-47 toxicity and their removal ability. The study also revealed that the sensitive Pseudanabaena could acquire a “resistance” to BDE-47, which was transferred to the next generation.

Original languageEnglish
Pages (from-to)451-461
Number of pages11
JournalChemosphere
Volume164
DOIs
Publication statusPublished - 1 Dec 2016
Externally publishedYes

Keywords

  • Cyanobacteria
  • F/F
  • Organic contaminant
  • Polybrominated diphenyl ethers
  • Toxicity mechanism

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