Evaluation of the antioxidant activity of the methanol, water and n-hexane extracts of Drosera intermedia, determined by the Folin-Ciocalteau (F-C), trolox equivalent antioxidant capacity (TEAC) and oxygen radical antioxidant capacity (ORAC) assays showed that the methanol extract had the highest antioxidant activity (F-C: 378.6 ± 31.5 μmolGAE/mgextract; TEAC: 332.2 ± 29.1 μmolTE/mgextract; ORAC: 64.7 ± 7.8 μmolTE/mgextract). Antimicrobial activity was tested against seven bacterial and eight yeast strains using the agar diffusion assay, followed by the determination of minimum inhibitory concentrations (MIC). All tested D. intermedia extracts demonstrated strong antimicrobial properties with a broad spectrum of activity. However, the n-hexane extract exhibited much greater activity than water and methanol extracts. The most susceptible microorganisms to the n-hexane extract were Staphylococcus epidermidis ATCC 12228 and Candida albicans YP0175, for which a MIC value of 13.0 μg/mL was scored.
As helicônias apresentam inflorescências com potencial de comercialização, pois além da beleza de cores e formas, produzem flores em quantidade e têm uma resistência excepcional após o corte. O Brasil, principalmente a região Nordeste, apresenta condições favoráveis para o desenvolvimento e produção de flores tropicais. Sabe-se que um dos principais problemas que acometem as helicônias são a ocorrência de nematoides e fungos. O sucesso econômico e ecológico do manejo dos fitonematoides requer a adoção de práticas combinadas, e neste contexto, o controle biológico poderá se constituir numa alternativa viável. Trinta e quatro amostras de solo da rizosfera de Heliconia spp. de diversos ecossistemas do sul da Bahia foram processadas para a identificação e isolamento de fungos nematófagos. , respectivamente). Aos 45 dias de aclimatação foi inoculado, nas helicônias, um coquetel preparado com os três fungos mais promissores. Verificouse que 30 dias após a primeira aplicação houve uma redução populacional significativa (P < 0,05) de R. reniformis (em solo e raízes) nas duas espécies de helicônias comparado ao tratamento testemunha. A mortalidade de R. reniformis após a segunda e terceira aplicação do coquetel não foi significativa para solo e raízes de H. rostrata, porém, em H. richardiana a redução acentuada de nematoides presentes nas raízes ocorreu após a terceira aplicação.Palavras-chave: controle biológico, nematoide reniforme, Heliconia spp., Arthrobotrys, Monacrosporium.Predacious fungi from the rhizosphere of heliconias as potential antagonists to Rotylenchulus reniformis. The heliconias have inflorescences with commercial potential, as well as the beauty of colors and forms, produce flowers in quantity and have exceptional strength after harvest. Brazil, especially the Northeast, has favorable conditions for the development and production of tropical flowers. We known that one of the main problems that affect the heliconias are the occurrence of nematodes and fungi. The economic and ecological success of the management of nematodes requires the adoption of combined practice, and in this context, biological control may constitute a viable alternative -four soil samples from the rhizosphere of Heliconia spp. diverse ecosystems of southern Bahia were processed for identification and isolation of nematophagous fungi. In vitro experiments were conducted with the objective to evaluate the potential of the fungi most frequent (Arthrobotrys conoides, A. musiformis, A. oligospora, Monacrosporium thaumasium and M. eudermatum) in the control of Meloidogyne incognita race 1. The most promising in vitro tests (A. musiformis , M. thaumasium and A. oligospora) were used in the experiment in a greenhouse, where Heliconia richardiana H. rostrata planted in soil naturally infested with Rotylenchulus reniformis (920 and 612 nematodes/100 cm 3 , respectively). At 45 days of acclimation was inoculated in heliconias, a cocktail prepared with the three fungi most promising. It was found that 30 days after the first application t...
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