Stilbenes from Deguelia rufescens var. urucu (Ducke) A. M. G. Azevedo leaves: effects on seed germination and plant growth

Journal of the Brazilian Chemical Society

Lívia T. Lobo²  Geilson A. Da Silva²  Manolo C. C. De Freitas²  Antonio Pedro S. Souza Filho¹  Milton N. Da Silva²  Alberto C. Arruda²  Giselle M. S. P. Guilhon²  Lourivaldo S. Santos²  Alberdan S. Santos²  Mara S. P. Arruda² 

[1] ,Universidade Federal do Pará Instituto de Ciências Exatas e Naturais Programa de Pós-Graduação em QuímicaBelém PA ,Brazil

关键词: Deguelia rufescens var. urucu;    stilbenes;    allelopathy;    allelochemicals;    phytotoxicity;    germination and growth inhibitions;   

DOI  :  10.1590/S0103-50532010001000007

来源: SciELO

【 摘 要 】

The Amazon biodiversity may provide plants whose chemical substances are capable of controlling weeds. In this study we report the isolation and identification of five stilbenes from the leaves of "timbó vermelho" (Deguelia rufescens var. urucu): 4-methoxylonchocarpene (1); 3,5-dimethoxy-4´-hydroxy-3´-prenyl-trans-stilbene (2), lonchocarpene (3), 3,5-dimethoxy-4´-O-prenyl-trans-stilbene (4) and pterostilbene (5). Compounds 2 and 4 are new natural products although 2 has been previously cited as synthesis product. Potential allelopathic activity for 1, 2 and 4 was evaluated over seed germination and plant growth of Mimosa pudica weed. The observed effects on seed germination did not vary significantly (p > 0.05) when the analysis of phytotoxicity was performed with the substances alone, the maximum inhibition did not exceed 20%. The most intense inhibitions on radicle and hypocotyl development were found for compound 4 (p < 0.05). When tested in pairs, showed antagonism for seed germination and synergism for radicle and hypocotyl development.

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