Banca de QUALIFICAÇÃO: STEFANE DA SILVA RODRIGUES

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
DISCENTE: STEFANE DA SILVA RODRIGUES
DATA: 20/02/2026
HORA: 14:00
LOCAL: https://meet.google.com/bch-whqd-qmz
TÍTULO: Insecticidal properties of Caryocar brasiliense essential oil and nanoemulsion against Bemisia tabaci MEAM1 in soybean plants and their inhibitory effects on acetyl-coenzyme A carboxylase
PALAVRAS-CHAVES: botanical insecticides, whitefly, natural products, nanotechnology, molecular docking
PÁGINAS: 48
GRANDE ÁREA: Ciências Agrárias
ÁREA: Agronomia
RESUMO:

The intensive use of synthetic insecticides has contributed to the development of resistance in insect pests and has caused environmental impacts, reinforcing the need for sustainable alternatives. Here, we develop nanoemulsions containing essential oil from the pulp of Caryocar brasiliense fruits and evaluate their insecticidal effect in Bemisia tabaci Middle East Asia Minor 1 (MEAM1) on soybean leaves. The essential oil was predominantly composed of esters, with ethyl hexanoate (92.82±0.56%) as the major compound. The nanoemulsion showed statistically similar efficacy to the synthetic insecticide thiamethoxam 24 h after treatment of soybean leaves at doses of 10,000 and 20,000 ppm without causing phytotoxicity, unlike the in natura essential oil that caused damage to the leaves at the highest concentration. The lethal concentrations required to reduce the number of individuals by 50% (LC50) for the nanoemulsion were 12368.0, 7162.8, 5364.9, and 3251.6 ppm at 48, 72, 96, and 120 h of exposure, respectively, whereas those for the in natura essential oil were 12617.5, 1102.3, 711.2, and 253.5 ppm, indicating that the greatest toxicity of the essential oil occurred over longer periods. Despite this, the nanoemulsion showed a superior phytosanitary profile, not inducing phytotoxicity symptoms in soybean leaves, releasing bioactive compounds gradually, and contributing to greater persistence over extended periods. Molecular docking analyses revealed the interaction of ethyl hexanoate with the acetyl-CoA carboxylase enzyme, suggesting that interference in lipid biosynthesis is a possible mechanism of action. These findings demonstrate the insecticidal potential of the essential oil from the pulp of C. brasiliense fruits, highlighting nanoemulsification as a promising strategy to reconcile biological efficacy in an economically viable way.

MEMBROS DA BANCA:
Presidente - 3015136 - FRANCISCA DIANA DA SILVA ARAUJO
Externo ao Programa - 2061108 - ELISON FABRICIO BEZERRA LIMA
Externo ao Programa - 2271211 - ESTEFENSON MARQUES MORAIS
Externo ao Programa - 3406304 - JACKSON LIMA AMARAL