title: Getting More Ecologically Relevant Information from Laboratory Tests: Recovery of Lemna minor After Exposure to Herbicides and Their Mixtures.
abstract: Recovery after exposure to herbicides-atrazine, isoproturon, and trifluralin-their binary and ternary mixtures, was studied under laboratory conditions using a slightly adapted standard protocol for Lemna minor. The objectives of the present study were (1) to compare empirical to predicted toxicity of selected herbicide mixtures; (2) to assess L. minor recovery potential after exposure to selected individual herbicides and their mixtures; and (3) to suggest an appropriate recovery potential assessment approach and endpoint in a modified laboratory growth inhibition test. The deviation of empirical from predicted toxicity was highest in binary mixtures of dissimilarly acting herbicides. The concentration addition model slightly underestimated mixture effects, indicating potential synergistic interactions between photosynthetic inhibitors (atrazine and isoproturon) and a cell mitosis inhibitor (trifluralin). Recovery after exposure to the binary mixture of atrazine and isoproturon was fast and concentration-independent: no significant differences between relative growth rates (RGRs) in any of the mixtures (IC10Mix, 25Mix, and 50Mix) versus control level were recorded in the last interval of the recovery phase. The recovery of the plants exposed to binary and ternary mixtures of dissimilarly acting herbicides was strictly concentration-dependent. Only plants exposed to IC10Mix, regardless of the herbicides, recovered RGRs close to control level in the last interval of the recovery phase. The inhibition of the RGRs in the last interval of the recovery phase compared with the control level is a proposed endpoint that could inform on reversibility of the effects and indicate possible mixture effects on plant population recovery potential.
authors.affiliation: Faculty of Sciences, Department of Biology and Ecology, University of Novi Sad, Dositej Obradović Square 3, 21 000, Novi Sad, Serbia. varja.knezevic@dbe.uns.ac.rs.
authors.forename: Varja
authors.identifier: http://orcid.org/0000-0003-0957-2032
authors.initials: V
authors.lastname: Knežević
authors.affiliation: Faculty of Sciences, Department of Biology and Ecology, University of Novi Sad, Dositej Obradović Square 3, 21 000, Novi Sad, Serbia.
authors.forename: Tanja
authors.initials: T
authors.lastname: Tunić
authors.affiliation: Faculty of Sciences, Department of Biology and Ecology, University of Novi Sad, Dositej Obradović Square 3, 21 000, Novi Sad, Serbia.
authors.forename: Pero
authors.initials: P
authors.lastname: Gajić
authors.affiliation: Faculty of Sciences, Department of Biology and Ecology, University of Novi Sad, Dositej Obradović Square 3, 21 000, Novi Sad, Serbia.|Department of Biology, University of Waterloo, 200 University Avenue West, Waterloo, ON, N2L 3G1, Canada.
authors.forename: Patricija
authors.initials: P
authors.lastname: Marjan
authors.affiliation: Faculty of Sciences, Department of Biology and Ecology, University of Novi Sad, Dositej Obradović Square 3, 21 000, Novi Sad, Serbia.
authors.forename: Danko
authors.initials: D
authors.lastname: Savić
authors.affiliation: Faculty of Sciences, Department of Biology and Ecology, University of Novi Sad, Dositej Obradović Square 3, 21 000, Novi Sad, Serbia.
authors.forename: Dina
authors.initials: D
authors.lastname: Tenji
authors.affiliation: Faculty of Sciences, Department of Biology and Ecology, University of Novi Sad, Dositej Obradović Square 3, 21 000, Novi Sad, Serbia.
authors.forename: Ivana
authors.initials: I
authors.lastname: Teodorović
mesh_terms: D035961:Alismatales / Q000187:drug effects*; D006540:Herbicides / Q000633:toxicity*; D007753:Laboratories; D018675:Toxicity Tests / Q000379:methods*; D014874:Water Pollutants, Chemical / Q000633:toxicity*
chemical_list: D006540:Herbicides; D014874:Water Pollutants, Chemical