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Ecotoxicological assessment of propiconazole using soil bacterial and fungal growth assays

Author:
  • David Fernández-Calviño
  • Johannes Rousk
  • Erland Bååth
  • Ulla Elisabeth Bollmann
  • Kai Bester
  • Kristian Koefoed Brandt
Publishing year: 2017-07-01
Language: English
Pages: 27-30
Publication/Series: Applied Soil Ecology
Volume: 115
Document type: Journal article
Publisher: Elsevier

Abstract english

Effects of the fungicide propiconazole on soil microorganisms were tested using [3H] leucine incorporation and [14C] acetate in ergosterol incorporation to measure bacterial and fungal growth inhibition, respectively. Growth was compared to basal respiration (BR) and substrate-induced respiration (SIR) in soil microcosms established according to the OECD 217 guideline. Fungal growth was most sensitive with IC50 values remaining around 300 mg kg−1 during 40 days of incubation. SIR was initially less sensitive (IC50 1300 mg kg−1), but IC50 values progressively decreased over time to reach 380 mg kg−1 after 40 days. Bacterial growth was affected at concentrations ≥200 mg kg−1, but exhibited more complex dose-response relationships possibly due to a combination of direct toxicity, bacterial community adaptation, and competitive release from the more severely affected fungi. BR was either stimulated or not affected by propiconazole. Our results indicate that group-specific endpoints targeting microbial growth will improve ecotoxicological assessment of toxicants for environmental risk assessment.

Keywords

  • Microbiology
  • Ecology
  • Biocides
  • Ecotoxicology
  • Fungicides
  • Microbial activity
  • Soil microorganisms

Other

Published
  • Microbial Ecology
  • ISSN: 0929-1393
Erland Bååth
E-mail: erland [dot] baath [at] biol [dot] lu [dot] se

Professor emeritus

MEMEG

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