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| Allelopathic effects of Sesamum indicum leaves and its chemical components |
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| Abstract: |
| It was documented that sesame（Sesamum indicum） could affect other plant growth and suppress weeds. But the internal mechanisms for those effects was little understood. The allelopathic effects of cutting leaves of sesame on Oryza sativa，Lactuca sativa，Raphanus sativus，and Brassica campestris，were tested in petri dishes in laboratory. Subsequently，the effects of extracts of steam distillation and ether from cutting leaves of sesame on growth of B. campestris and R. sativus were investigated using bioassay tests. The results from petri dishes in laboratory showed that cutting leaves of sesame had significant effects on inhibiting the growth of receptor seedling，as the following order: L.sativa>B. grass>O. sativa，and the scale of these inhibitions was concentration dependent. The results from bioassay tests indicated that extracts of steam distillation and ether from cutting leaves of sesame suppressed the germination rate and root length of B. campestris and R. sativus. However，the seedling height and fresh weight of receptor plants increased at lower concentrations steam distillation and ether exudates，but decreased at higher concentrations. Volatile compounds form cutting leaves of sesame were extracted by solid phase microextraction and analyzed by gas chromatogra-phy-mass spectrometry. Unsaturated lactone class，sulfide and alkaloids were identified in the solid phase microextraction，and these may be the allelochemicals. |
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