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

Franco, Danilo Miralha [UNESP]; Saldanha, Luiz Leonardo [UNESP]; Lima Neto, Jose de Sousa [UNESP]; Santos, Lourdes Campaner dos [UNESP]; Dokkedal, Anne Ligia [UNESP]; Rolim de Almeida, Luiz Fernando [UNESP]

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

Arquivos

S0102-33062016000200157.pdf (4.17 MB)

Data

2016-04-01

Autores

Franco, Danilo Miralha

Saldanha, Luiz Leonardo

Lima Neto, Jose de Sousa

Santos, Lourdes Campaner dos

Dokkedal, Anne Ligia

Rolim de Almeida, Luiz Fernando

Editor

Soc Botanica Brasil

Tipo

Artigo

Direito de acesso

Acesso aberto

Resumo

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-alpha-rhamnoside and kaempferol-3-O-alpha-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.