Data/hora: 02/06/2024 09:27:20

Provedor de dados: | 5
País: | France
Título: | Effect of Bentazon on Growth and Physiological Responses of Marine Diatom: Chaetoceros gracilis
Autores: | Hourmant, Annick; Amara, Anis; Pouline, Patrick; Durand, Gael; Arzul, Genevieve; Quiniou, Francoise.
Data: | 2009-02
Ano: | 2009
Palavras-chave: | Photosynthesis; Marine diatom; Growth; Chlorophylls; Chaetoceros gracilis; Carotenoids; Bentazon; ATP.
Resumo: | The herbicide bentazon (CASRN 25057-89-0) is extensively used in agriculture in Brittany (France) to replace atrazine. Bentazon is not readily adsorbed by soil and therefore it enters adjacent freshwater ecosystems, making its way to estuarine and marine waters areas. Information regarding its effects on marine ecosystems is scarce. Phytotoxicity assessments were conducted in the laboratory on the common diatom Chaetoceros gracilis using both the active ingredient and its formulated product (Basamais). The 3 day EC50 Using cell counts were, respectively, 150 mg/L and 60 mu g/L for bentazon active ingredient and for bentazon-formulated while cellular volume was increased. Although bentazon is known as a photosystem II inhibitor, it produced an increase of pigment (chlorophylls a, c, and carotenoids) content, ATP synthesis, rates of photosynthesis and respiration, and TBARS formation. Therefore, pigments cannot be used as biomarkers of toxicity. Algal cell recovery from bentazon effects occurred after 6-9 days, suggesting a tolerance mechanism.
Tipo: | Text
Idioma: | Inglês

Identificador:

http://archimer.ifremer.fr/doc/2009/publication-6637.pdf

DOI:10.1080/15376510802290892

Editor: | Taylor &amp; Francis
Relação: | http://archimer.ifremer.fr/doc/00000/6637/
Formato: | application/pdf
Fonte: | Toxicology Mechanisms and Methods (1537-6524) (Taylor &amp; Francis), 2009-02 , Vol. 19 , N. 2 , P. 109-115
Fonte: | 2009 Taylor &amp; Francis, Informa