RESUMO
From the methanol seed extract of Rollinia occidentalis five acetogenins were isolated, sylvaticin (1), rolliniastatin-1 (2), rolliniastatin-2 (3), motrilin (4) and desacetyluvaricin (5), and evaluated for their toxicity and nutritional alterations on Spodoptera frugiperda Smith (Lepidoptera: Noctuidae). All but one of the compounds produced more than 90% mortality on early larval instars at 50 and 100 microg per g of diet. Sylvaticin caused 15 and 60% mortality at 50 and 100 microg/g, respectively, while the methanol seed extract reached 35 and 50% at 100 and 250 microg/g, respectively. The addition of R. occidentalis methanolic seed extract (100 and 250 microg/g) and sylvaticin (100 microg/g) to the larval diet brought about significant changes to the nutritional indices in connection with larvae fed the control diet. This is the first report on the isolation of acetogenins from R. occidentalis and their insecticidal effects on S. frugiperda.
Assuntos
Acetogeninas/toxicidade , Inseticidas/toxicidade , Extratos Vegetais/toxicidade , Rollinia/química , Animais , Cromatografia Líquida de Alta Pressão , Cromatografia em Camada Fina , Larva/efeitos dos fármacos , Metanol , Sementes/química , Solventes , SpodopteraRESUMO
From an Argentine collection of the tropical tree Rollinia emarginata (Annonaceae), vomifoliol, dehydrovomifoliol, blumenol C, loliolide, 7-epiloliolide, vanillin, dihydroactinolide, as well as other common plant constituents were obtained, and identified by their NMR and MS features compared with authentic samples. Antifeedant and toxic actions were exerted to the polyphagous moth Spodoptera frugiperda by the ethanol extract of the plant, at 250 ppm in the larval diet. Additionally, in greenhouse studies, a 200 ppm aqueous solution of the extract produced a post-emergency herbicidal effect on the annual weed common lambsquarter (Chenopodium album).