Document Detail


Dose-dependent effects of the herbicide mesotrione on soil cyanobacterial communities.
MedLine Citation:
PMID:  23014935     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
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.
Authors:
Olivier Crouzet; Jarosław Wiszniowski; Florence Donnadieu; Frédérique Bonnemoy; Jacques Bohatier; Clarisse Mallet
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2012-09-27
Journal Detail:
Title:  Archives of environmental contamination and toxicology     Volume:  64     ISSN:  1432-0703     ISO Abbreviation:  Arch. Environ. Contam. Toxicol.     Publication Date:  2013 Jan 
Date Detail:
Created Date:  2012-12-27     Completed Date:  2013-09-06     Revised Date:  2014-08-08    
Medline Journal Info:
Nlm Unique ID:  0357245     Medline TA:  Arch Environ Contam Toxicol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  23-31     Citation Subset:  IM    
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MeSH Terms
Descriptor/Qualifier:
Cyanobacteria / drug effects*,  physiology
Cyclohexanones / toxicity*
Dose-Response Relationship, Drug
Herbicides / toxicity*
Risk Assessment
Soil / chemistry
Soil Microbiology*
Soil Pollutants / toxicity*
Chemical
Reg. No./Substance:
0/Cyclohexanones; 0/Herbicides; 0/Soil; 0/Soil Pollutants; 48TR68G21T/mesotrione

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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