| Autor: |
da Silva UP; a Laboratory of Analysis and Synthesis of Agrochemicals, Department of Chemistry , Universidade Federal de Viçosa , Viçosa , Brazil., Furlani GM; a Laboratory of Analysis and Synthesis of Agrochemicals, Department of Chemistry , Universidade Federal de Viçosa , Viçosa , Brazil., Demuner AJ; a Laboratory of Analysis and Synthesis of Agrochemicals, Department of Chemistry , Universidade Federal de Viçosa , Viçosa , Brazil., da Silva OLM; b Instituto de Botânica , Universidade de São Paulo , São Paulo , Brazil., Varejão EVV; a Laboratory of Analysis and Synthesis of Agrochemicals, Department of Chemistry , Universidade Federal de Viçosa , Viçosa , Brazil. |
| Abstrakt: |
Euphorbia heterophylla L. is regarded as a major weed worldwide. Its high aggressiveness in agricultural environment prompted us to investigate the allelopatic activity and chemical constitution of extracts from roots of this plant. Hexane extract showed low phytotoxic activity. Methanol extract at 2.0 mg mL -1 inhibited 100% of germination, root and shoot growth of the indicator plants Sorghum bicolor and Lactuca sativa . β -sitosterol, stigmasterol, and esters of lupeol, germanicol, taraxasterol, pseudotaraxasterol, α -amyrin and β -amyrin were isolated from the hexane extract and their structures elucidated on the basis of MS and 1 H, 13 C and DEPT-135 NMR data. GC-MS analysis of the derivatized methanol extract allowed for identifying a series of allelopathic organic acids potentially involved in allelopathic interactions of E. heterophylla . This is the first study on the allelopathic activity of extracts and identification of metabolites from roots of E. heterophylla . |
