Allelopathic potential of Rapanea umbellata leaf extracts.
The stressful conditions associated with the Brazilian savanna (Cerrado) environment were supposed to favor higher levels of allelochemicals in Rapanea umbellata from this ecosystem. The allelopathic potential of R. umbellata leaf extracts was studied using the etiolated wheat coleoptile and standard phytotoxicity bioassays. The most active extract was selected to perform a bioassay-guided isolation, which allowed identifying lutein (1) and (-)-catechin (2) as potential allelochemicals. Finally, the general bioactivity of the two compounds was studied, which indicated that the presence of 1 might be part of the defense mechanisms of this plant.
Departamento de Botanica, Universidade Federal de São Carlos, Rodovia Washington Luís, km 235, São Carlos - São Paulo, CEP 13565-905, Brazil.
Paula
P
Novaes
Maristela
M
Imatomi
Rosa M
RM
Varela
José M G
JM
Molinillo
Rodney
R
Lacret
Sonia C J
SC
Gualtieri
Francisco A
FA
Macías
D001681:Biological Assay; D002392:Catechin / Q000737:chemistry* / Q000494:pharmacology; D018548:Cotyledon / Q000187:drug effects* / Q000254:growth & development; D020128:Inhibitory Concentration 50; D014975:Lutein / Q000737:chemistry* / Q000494:pharmacology; D009682:Magnetic Resonance Spectroscopy; D010675:Pheromones / Q000737:chemistry / Q000494:pharmacology; D010936:Plant Extracts / Q000737:chemistry* / Q000494:pharmacology*; D018515:Plant Leaves / Q000737:chemistry*; D029623:Primulaceae / Q000737:chemistry*; D014908:Triticum / Q000187:drug effects* / Q000254:growth & development
D010675:Pheromones; D010936:Plant Extracts; D002392:Catechin; D014975:Lutein
Allelopathy; Catechin; Lutein; Phytotoxic activity; Rapanea umbellata