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Article Dans Une Revue Archives of Environmental Contamination and Toxicology Année : 2013

Dose-dependent effects of the herbicide mesotrione on soil cyanobacterial communities.

Résumé

This study aimed to investigate the dose-response effects of an herbicide on soil photosynthetic microbial communities, particularly cyanobacteria, using a microcosm approach. Pure mesotrione (active ingredient), and Callisto (a commercial formulation of this triketone herbicide), were spread at different rates on soil microcosm surfaces. Soil Chlorophyll concentrations were quantified to assess the photosynthetic biomass, and the genetic structure and diversity of the cyanobacterial community were investigated by a group-specific polymerase chain reaction followed by denaturing gradient gel electrophoresis. Dose-dependent responses were evidenced for both functional and structural parameters. No effect was detected in soils treated with 1 × AR (1-fold recommended application rate) irrespective of the herbicide formulation. At 10 × AR (10-fold recommended application rate), only Callisto treatment induced significant decreases of photosynthetic biomass, whereas structural parameters were less affected. At the 100 × AR (100-fold recommended application rate), both pure mesotrione and Callisto had strong negative impacts on soil chlorophyll concentrations and cyanobacterial genetic structure and diversity. At both the 10 × AR and 100 × AR treatments, Callisto induced significant stronger effects than pure mesotrione. In addition, indicators of photosynthetic biomass, compared with structural parameters of cyanobacterial communities (within 14 days), responded (within 7 days) more quickly to herbicide stress. The results of this study underscore the relevance of soil photosynthetic microbial communities to develop indicators for herbicide risk assessment.

Dates et versions

hal-00815290 , version 1 (18-04-2013)

Identifiants

Citer

Olivier Crouzet, Jarosław Wiszniowski, Florence Donnadieu, Frédérique Bonnemoy, Jacques Bohatier, et al.. Dose-dependent effects of the herbicide mesotrione on soil cyanobacterial communities.. Archives of Environmental Contamination and Toxicology, 2013, 64 (1), pp.23-31. ⟨10.1007/s00244-012-9809-9⟩. ⟨hal-00815290⟩
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