Navegando por Autor "Venâncio, Stéphany de Campos"

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    Dissertação
    Atividade nematicida de extratos de Brugmansia suaveolens sobre Meloidogyne incognita
    (Universidade Estadual do Norte do Paraná, 2026) Venâncio, Stéphany de Campos; Alves, Viviane Sandra; https://orcid.org/0000-0003-2381-8115; http://lattes.cnpq.br/3794580975938452; Alves, Viviane Sandra; https://orcid.org/0000-0003-2381-8115; http://lattes.cnpq.br/3794580975938452; Poletto, Rodrigo de Souza; https://orcid.org/0000-0002-7034-7865; http://lattes.cnpq.br/8774064317309922; Silva, Santino Aleandro da; https://orcid.org/0000-0002-1019-1926; http://lattes.cnpq.br/8341476195396585
    Meloidogyne incognita stands out as one of the most aggressive and widely distributed species in tropical regions, causing severe damage to plant root systems. The need for alternatives to synthetic nematicides drives research into plant-based compounds with biological potential and lower environmental impact. In this context, the present study aimed to evaluate the nematicidal activity of aqueous and hydroalcoholic extracts from leaves and flowers of Brugmansia suaveolens (Solanaceae) on second-stage juveniles (J2) of M. incognita. The experiments were conducted under controlled laboratory conditions, using J2 obtained from infected tomato roots, processed with sodium hypochlorite solution and filtered through 250 and 500 mesh sieves. The suspensions containing J2 were exposed to two types of extracts (aqueous and hydroalcoholic) at different concentrations, and a negative control was performed with distilled water. The mortality of the juveniles was evaluated after 24 hours of exposure, and the data obtained were submitted to analysis of variance and Tukey's test (p<0.05). The aqueous extracts caused higher mortality of M. incognita J2, with the flower extract causing up to 98% mortality in all concentrations evaluated and showing no significant difference. The aqueous leaf extract, on the other hand, showed dose-dependent mortality, with values varying according to the dose tested. For the hydroalcoholic extracts, mortality was observed in the extracts obtained from flowers and leaves, with values ranging from 46 to 59% mortality. Analysis by gas chromatography coupled with mass spectrometry (GC-MS) for the detection and identification of volatile chemical constituents present in B. suaveolens extracts confirmed significant differences between the extracts, both in terms of the extraction method and the part of the plant used.