Banca de QUALIFICAÇÃO: SIRLEY ÁVILA QUEIROZ

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
STUDENT : SIRLEY ÁVILA QUEIROZ
DATE: 28/12/2023
TIME: 14:00
LOCAL: https://meet.google.com/wav-mpdv-dmu
TITLE:

GENOTOXICITY OF GLYPHOSATE TO TAMBAQUI (Colossoma macropomum) IN CHRONIC EXPOSURE

KEY WORDS:

Ecotoxicology, environmental intoxication, monitoring, genetic degeneration, micronucleus

PAGES: 39
BIG AREA: Ciências Biológicas
AREA: Ecologia
SUBÁREA: Ecologia de Ecossistemas
SUMMARY:

Agricultural pesticides are chemical products widely used in agriculture in order to combat unwanted pest attacks that can drastically reduce the productivity of a plantation. However, when these agrochemicals are used incorrectly, they can cause irreversible contamination of the environment. Glyphosate is the most used product in the world to combat weeds that block the normal growth of main crops. Glyphosate acts on plants by binding and blocking the activity of the enzyme (5-enolpyruvylshikimate-3-phosphate - EPSP) by inhibiting the synthesis of aromatic amino acids (phenylalanine, tyrosine and tryptophan). The preliminary results of this research indicated that the Lethal Concentration 50 (LC50-48h) of glyphosate for tambaqui was 14.32 mg/L. In different water depth scenarios, glyphosate was shown to pose a low risk for environmental intoxication at specific concentrations. In waters 0.30 m deep, the Risk Quotient (RQ) index was less than 0.01397 mg/L, indicating low risk at concentrations between 0.00312 and 0.2 mg/L. In waters 2.0 m deep, glyphosate maintained its low risk classification, but with the need for caution in use. After chronic exposure (4.77 mg/L) for thirty days and after applying the Mann-Whitney test, a significant difference was observed between the fish exposed to glyphosate and the control group, suggesting potential genetic damage caused by the herbicide. Additionally, cellular changes such as notched, micronucleus, binucleus, vacuolated and bebbled were evaluated. However, when applying the Kruskal-Wallis test, no significant difference was observed between the cellular changes caused by glyphosate. This study highlights the importance of responsible use of herbicides such as glyphosate, given their genotoxic potential in fish and the associated environmental risk. Careful management is crucial to minimize negative impacts on aquatic life and the ecosystem as a whole.

COMMITTEE MEMBERS:
Presidente - 1427035 - WILSON GOMEZ MANRIQUE
Interna - 1523620 - RUBIANI DE CASSIA PAGOTTO
Externa ao Programa - 2421710 - MAYRA ARAGUAIA PEREIRA FIGUEIREDO - UNIR