Investigation of phenolic compounds with allelopathic potential in leaves of a tree invader of restinga (Terminalia catappa L.) Erika Guisante Rojas, Marcos Paulo Oliveira Silva, Mara Angelina Galvão Magenta, Walber Thoma

Abstract

Terminalia catappa L., popularly known as amendoeira-da-praia, cuca and chapéu-de-sol, is an exotic species used for afforestation in countries with tropical and subtropical climates, especially in coastal regions due to its adaptability in areas with wind and salinity. Literature data indicate that among the constituents present in polar extracts obtained from their leaves are mainly polyphenolic compounds, especially tannins. As grants to test their allelopathic potential relative to other plant species, extraction process was performed by obtaining the aqueous fraction from the leaves of T. catappa and further studies will be performed with phytochemicals in order to investigate the presence of tannins. Reactions were performed with 10% acetic acid, 10% lead acetate, Stiasny reagent and ferric chloride 2%. The results show positivity for gallic tannins such as gallic acid. Literature data indicate that the presence of gallic acid points to allelopathic effects. At a later stage, seeds of restinga plant species will be exposed to different concentrations of aqueous fraction obtained from this species with objective of investigate the effects on their germination by these substances.