Evaluation Of Allelopathic Potential, Antimicrobial And Antioxidant Activities Of Pyrostegia Venusta (ker Gawl.) Miers (bignoniaceae) Leaf Organic Extracts [avaliação Do Potencial Alelopático, Atividade Antimicrobiana E Antioxidante Dos Extratos Orgânicos Das Folhas De Pyrostegia Venusta (ker Gawl.) Miers (bignoniaceae)]

This paper presents the results of allelopathic, antimicrobial and antioxidant activities of organic extracts (hexane, ethyl acetate and methanol) from the leaves of Pyrostegia venusta (Ker Gawl.) Miers (Bignoniaceae). Allelopathic activity was assessed based on Cucumis sativus (cucumber) development for the parameters main root length, number of secondary roots and hypocotyl length. All tested extracts affected the first two parameters, while the hypocotyl length was not affected only by the ethyl acetate extract. For antimicrobial activity, assessed by MIC assay, hexane extract showed moderate inhibition for Staphylococcus aureus (0.9 mg mL-1) and strong inhibition for Enterococcus hirae (0.5 mg mL-1). Ethyl acetate extract showed strong activity against Candida albicans (0.3 mg mL-1), whereas methanolic extract was not active against the tested microorganisms. 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