Journal
CHEMISTRY & BIODIVERSITY
Volume 10, Issue 8, Pages 1539-1548Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cbdv.201200367
Keywords
Rapanea umbellata; Allelopathy; Catechin; Lutein; Phytotoxic activity
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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.
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