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Short-term toxicity assessment of a triazine herbicide (terbutryn) underestimates the sensitivity of soil microorganisms

Fernández-Calviño, David LU ; Rousk, Johannes LU ; Bååth, Erland LU ; Bollmann, Ulla E. ; Bester, Kai and Brandt, Kristian K. (2021) In Soil Biology and Biochemistry 154.
Abstract

Little is known about the impacts of persistent triazine herbicides and biocides on soil microorganisms. Terbutryn toxicity in soil microorganisms was studied using bacterial and fungal growth, substrate induced respiration (SIR) and basal respiration as ecotoxicological end-points. In the short-term (0–7 days), increasing concentrations of terbutryn (0–800 mg kg−1) progressively inhibited bacterial and fungal growth by up to 33–36% (4 h) and 49–55% (7 days), whereas SIR and basal soil respiration remained unaffected. Following long-term (40 days) exposure to terbutryn, both bacterial and fungal growth were inhibited by up to 76–78%, and SIR was inhibited by up to 53%. Hence, our results unexpectedly demonstrate... (More)

Little is known about the impacts of persistent triazine herbicides and biocides on soil microorganisms. Terbutryn toxicity in soil microorganisms was studied using bacterial and fungal growth, substrate induced respiration (SIR) and basal respiration as ecotoxicological end-points. In the short-term (0–7 days), increasing concentrations of terbutryn (0–800 mg kg−1) progressively inhibited bacterial and fungal growth by up to 33–36% (4 h) and 49–55% (7 days), whereas SIR and basal soil respiration remained unaffected. Following long-term (40 days) exposure to terbutryn, both bacterial and fungal growth were inhibited by up to 76–78%, and SIR was inhibited by up to 53%. Hence, our results unexpectedly demonstrate time-cumulative microbial growth inhibition over extended time periods in soil and indicate that current ecotoxicological guidelines may underestimate risks posed by chemicals to soil microorganisms.

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author
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organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Bacterial growth, Ecotoxicological assessment, Fungal growth, Pesticides, Substrate-induced respiration, Time
in
Soil Biology and Biochemistry
volume
154
article number
108130
publisher
Elsevier
external identifiers
  • scopus:85099500077
ISSN
0038-0717
DOI
10.1016/j.soilbio.2021.108130
language
English
LU publication?
yes
id
26ff1d84-1462-4b40-8cbd-e9b5b675edcc
date added to LUP
2021-01-28 09:59:02
date last changed
2024-05-16 03:46:25
@article{26ff1d84-1462-4b40-8cbd-e9b5b675edcc,
  abstract     = {{<p>Little is known about the impacts of persistent triazine herbicides and biocides on soil microorganisms. Terbutryn toxicity in soil microorganisms was studied using bacterial and fungal growth, substrate induced respiration (SIR) and basal respiration as ecotoxicological end-points. In the short-term (0–7 days), increasing concentrations of terbutryn (0–800 mg kg<sup>−1</sup>) progressively inhibited bacterial and fungal growth by up to 33–36% (4 h) and 49–55% (7 days), whereas SIR and basal soil respiration remained unaffected. Following long-term (40 days) exposure to terbutryn, both bacterial and fungal growth were inhibited by up to 76–78%, and SIR was inhibited by up to 53%. Hence, our results unexpectedly demonstrate time-cumulative microbial growth inhibition over extended time periods in soil and indicate that current ecotoxicological guidelines may underestimate risks posed by chemicals to soil microorganisms.</p>}},
  author       = {{Fernández-Calviño, David and Rousk, Johannes and Bååth, Erland and Bollmann, Ulla E. and Bester, Kai and Brandt, Kristian K.}},
  issn         = {{0038-0717}},
  keywords     = {{Bacterial growth; Ecotoxicological assessment; Fungal growth; Pesticides; Substrate-induced respiration; Time}},
  language     = {{eng}},
  publisher    = {{Elsevier}},
  series       = {{Soil Biology and Biochemistry}},
  title        = {{Short-term toxicity assessment of a triazine herbicide (terbutryn) underestimates the sensitivity of soil microorganisms}},
  url          = {{http://dx.doi.org/10.1016/j.soilbio.2021.108130}},
  doi          = {{10.1016/j.soilbio.2021.108130}},
  volume       = {{154}},
  year         = {{2021}},
}