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Glutathione S-transferase activity in aquatic macrophytes and halophytes and biotransformation potential for biocides.
Dos Santos, Rodrigo Nunes; Machado, Bruno Roswag; Hefler, Sônia Marisa; Zanette, Juliano.
Afiliação
  • Dos Santos RN; Universidade Federal do Rio Grande (FURG), Instituto de Ciências Biológicas (ICB), Av. Itália Km 8, Rio Grande, RS, 96203-900, Brazil.
  • Machado BR; Programa de Pós-Graduação em Biologia de Ambientes Aquáticos Continentais, Instituto de Ciências Biológicas, Universidade Federal do Rio Grande (FURG), Rio Grande, RS, 96203-900, Brazil.
  • Hefler SM; Universidade Federal do Rio Grande (FURG), Instituto de Ciências Biológicas (ICB), Av. Itália Km 8, Rio Grande, RS, 96203-900, Brazil.
  • Zanette J; Universidade Federal do Rio Grande (FURG), Instituto de Ciências Biológicas (ICB), Av. Itália Km 8, Rio Grande, RS, 96203-900, Brazil.
J Plant Res ; 134(3): 577-584, 2021 May.
Article em En | MEDLINE | ID: mdl-33682041
Glutathione S-transferase (GST) participates in the biotransformation of many xenobiotics including biocides. Its activity in plants is generally associated with their phytoremediation capabilities. Biocides have been used in agriculture and antifouling paints and they represent risks for the aquatic environment. The present study aimed to: (1) evaluate the basal GST activity in roots, stems, and leaves from thirteen plants (eleven aquatic macrophytes and two halophytes) collected at South Brazil wetlands; (2) estimate the biotransformation potential of Nothoscordum gracile for five biocides using competitive kinetic assays with 1-chloro-2,4-dinitrobenzene (CDNB), a typical GST substrate. The N. gracile, Spartina alterniflora and Cakile maritima presented the highest GST activities among the tested plants. The Lineweaver-Burk plot obtained from the GST competitive kinetic assays confirmed that the biocides chlorothalonil, 4,5-dichloro-N-octyl-3(2H)-isothiazolone (DCOIT), dichlofluanid, and diuron, but not irgarol, compete with the substrate CDNB for GST. Chlorothalonil and DCOIT showed the lowest IC20 values (11.1 and 10.6 µM, respectively), followed by dichlofluanid (38.6 µM) and diuron (353.1 µM). The inhibition of GST-CDNB activity by 100 nM biocide was higher for chlorothalonil, DCOIT, and dichlofluanid (46.5, 49.0, and 45.1%, respectively) than for diuron (6.5%) and irgarol (2.2%). The present study indicates plant species that have significant GST activity and could be potentially used for phytoremediation. The competitive kinetic tests suggest that among the five biocides that were tested, chlorothalonil, DCOIT, and dichlofluanid are probably preferred for biotransformation via GST in plant.
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Poluentes Químicos da Água / Desinfetantes País/Região como assunto: America do sul / Brasil Idioma: En Revista: J Plant Res Assunto da revista: BOTANICA Ano de publicação: 2021 Tipo de documento: Article País de afiliação: Brasil País de publicação: Japão
Texto completo
Adicionar na Minha BVS
Imprimir
XML
PubMed Links
Buscar no Google

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Poluentes Químicos da Água / Desinfetantes País/Região como assunto: America do sul / Brasil Idioma: En Revista: J Plant Res Assunto da revista: BOTANICA Ano de publicação: 2021 Tipo de documento: Article País de afiliação: Brasil País de publicação: Japão