Seasonal variation in allelopathic potential of the leaves of Copaifera langsdorffii Desf.

Autor(es)

Danilo Miralha Franco ^[1] ; Luiz Leonardo Saldanha ^[2] ; José de Sousa Lima Neto ^[3] ; Lourdes Campaner dos Santos ^[4] ; Anne Ligia Dokkedal ^[5] ; Luiz Fernando Rolim de Almeida ^[6]

Afiliação do(s) autor(es)

^[1] Universidade Estadual Paulista. Departamento de Botânica - Brasil

^[2] Universidade Estadual Paulista. Departamento de Ciências Biológicas - Brasil

^[3] Universidade Estadual Paulista. Departamento de Química Orgânica - Brasil

^[4] Universidade Estadual Paulista. Departamento de Química Orgânica - Brasil

^[5] Universidade Estadual Paulista. Departamento de Ciências Biológicas - Brasil

^[6] Universidade Estadual Paulista. Departamento de Botânica - Brasil

• Tipo de documento: Artigo Científico
• Fonte: Acta Botanica Brasilica; v. 30, n. 2, p. 157-165, 2016-03-15.

Resumo

ABSTRACT The deciduous plant Copaifera langsdorffii contains important medicinal compounds which may also be allelopathic and inhibitory to plant growth. The species is endemic to the Brazilian Cerrado where there is pronounced climatic seasonality. In this study we demonstrate the allelopathic capacity of extracts from the leaves of C. langsdorffii and pre-purified fractions of the extract. Analysis by HPLC-PAD-ESI-MS confirmed the presence of quercetin-3-O-α-rhamnoside and kaempferol-3-O-α-rhamnoside as major components, as well as phenolic acid derivatives of gallic acid. The extracts from samples collected during the wet season were rich in flavonoids and reduced the seed germination rate, root emergence time, and root growth of Sorghum bicolor seedlings. Leaves of C. langsdorffii collected in both the wet and the dry season did not differ in the overall phytotoxic potential of their extracts, but differences detected in tested subfractions seem to indicate subtle seasonal changes in chemical composition. These results indicate that changes in the seasonal water status of the Cerrado induces differential synthesis of compounds with higher allelopathic activity. (AU)

• Processo FAPESP: 10/15585-6 - Efeito do déficit hídrico no potencial alelopático de copaíba (Copaifera langsdorffii Desf.)
• Beneficiário: Luiz Fernando Rolim de Almeida
• Modalidade de apoio: Auxílio à Pesquisa - Regular