Phytotoxicity of 2,4-D and fipronil mixtures to three green manure species

Autor(es)

Ogura, Allan Pretti ; Lima, Jacqueline Zanin ; da Silva, Lais Conceicao Menezes da ; Dias, Mariana Amaral ; Rodrigues, Valeria Guimaraes Silvestre ; Montagner, Cassiana Carolina ; Espindola, Evaldo Luiz Gaeta

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH PART B-PESTICIDES FOOD CONTAMIN; v. N/A, p. 11-pg., 2023-02-16.

Resumo

Sugarcane expansion has been associated with soil contamination by agrochemicals. Pesticides can affect plant growth, and their mixture might have potentiated effects on exposed species. This research aimed to evaluate the influence of fipronil on the phytotoxicity of 2,4-D on three green manure plant species: Canavalia ensiformis, Dolichos lablab, and Lupinus albus. Plants were exposed (for 21 days, at 25 degrees C) to a control soil and five concentrations of each pesticide and their combinations (36 treatments, considering a full-factorial approach). Effect concentrations of 50% growth inhibition (EC50) were estimated. No phytotoxicity effects were identified when plants were exposed to different fipronil concentrations (up to 0.12 mg kg(-1)). All species exposed to 2,4-D showed a decrease in shoot and root length and fresh/dry biomass. L. albus and D. lablab roots showed the highest sensitivity when exposed to 2,4-D among the endpoints (EC50 = 0.02 and 0.05 mg kg(-1), respectively), while C. ensiformis roots were the most tolerant (EC50 = 0.98 mg kg(-1)). However, the interference of fipronil on the toxicity of 2,4-D was not detected in different mixture proportions, indicating no interaction between pesticides. Residues of 2,4-D might also impair other crops' growth, compromise productivity, and limit phytotechnologies for soil recovery. (AU)

• Processo FAPESP: 15/18790-3 - Consequências ambientais da conversão pastagem-cana-de-açúcar e intensificação de pastagens
• Beneficiário: Luiz Antonio Martinelli
• Modalidade de apoio: Auxílio à Pesquisa - Programa de Pesquisa sobre Mudanças Climáticas Globais - Temático
• Processo FAPESP: 17/16961-0 - Emprego de composto orgânico e turfa na retenção de PB, Zn e Cd e avaliação da possível disponibilidade, toxicidade e bioacessibilidade destes metais após retenção
• Beneficiário: Jacqueline Zanin Lima
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 21/14789-1 - Ecotoxicidade e bioacumulação de fármacos: avaliação do tratamento em biorreatores anaeróbios
• Beneficiário: Allan Pretti Ogura
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado