Ecotoxicological assessment of propiconazole using soil bacterial and fungal growth assays

Fernández-Calviño, David; Rousk, Johannes; Bååth, Erland; Bollmann, Ulla Elisabeth, et al. (2017-07-01). Ecotoxicological assessment of propiconazole using soil bacterial and fungal growth assays. Applied Soil Ecology, 115,, 27 - 30
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DOI:
| Published | English
Authors:
Fernández-Calviño, David ; Rousk, Johannes ; Bååth, Erland ; Bollmann, Ulla Elisabeth , et al.
Department:
BECC: Biodiversity and Ecosystem services in a Changing Climate
MEMEG
Microbial Ecology
Research Group:
Microbial Ecology
Abstract:

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:
Biocides ; Ecotoxicology ; Fungicides ; Microbial activity ; Soil microorganisms ; Microbiology ; Ecology
ISSN:
0929-1393
LUP-ID:
6afe5b77-23b6-41c9-bf3b-01f7c5cf661d | Link: https://lup.lub.lu.se/record/6afe5b77-23b6-41c9-bf3b-01f7c5cf661d | Statistics

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