Produção Nacional
Revisado por pares
Responses of the nitrogen-fixing aquatic fern Azolla to water contaminated with ciprofloxacin: Impacts on biofertilization
2017; Elsevier BV; Volume: 232; Linguagem: Inglês
10.1016/j.envpol.2017.09.054
ISSN1873-6424
AutoresMarcelo Pedrosa Gomes, Júlio César Moreira Brito, Marília Mércia Lima Carvalho Carneiro, Mariem Rodrigues Ribeiro Cunha, Queila Souza Garcia, Cléber Cunha Figueredo,
Tópico(s)Aquatic Ecosystems and Phytoplankton Dynamics
ResumoWe investigated the ability of the aquatic fern Azolla to take up ciprofloxacin (Cipro), as well as the effects of that antibiotic on the N-fixing process in plants grown in medium deprived (-N) or provided (+N) with nitrogen (N). Azolla was seen to accumulate Cipro at concentrations greater than 160 μg g −1 dry weight when cultivated in 3.05 mg Cipro l −1 , indicating it as a candidate for Cipro recovery from water. Although Cipro was not seen to interfere with the heterocyst/vegetative cell ratios, the antibiotic promoted changes with carbon and nitrogen metabolism in plants. Decreased photosynthesis and nitrogenase activity, and altered plant's amino acid profile, with decreases in cell N concentrations, were observed. The removal of N from the growth medium accentuated the deleterious effects of Cipro, resulting in lower photosynthesis, N-fixation, and assimilation rates, and increased hydrogen peroxide accumulation. Our results shown that Cipro may constrain the use of Azolla as a biofertilizer species due to its interference with nitrogen fixation processes. • The uptake and effects of Cipro on N-fixing process by Azolla were investigated. • Azolla was seen to accumulate Cipro at concentrations greater than 160 μg g −1 DW. • Cipro interfere with carbon and nitrogen metabolism in plants. • N-fixing was reduced by Cipro. Ciprofloxacin interfere with N-fixing process in Azolla plants, constraining its use as a biofertilizer species.
Referência(s)