摘要 : This study determined the chemical contents of dichloromethane bark extract of. murncoides that inhibited the seed germination in T. recurvata. Dichloromethane bark extract was subjected to two consecutive fractionations. The inhi... 展开 This study determined the chemical contents of dichloromethane bark extract of. murncoides that inhibited the seed germination in T. recurvata. Dichloromethane bark extract was subjected to two consecutive fractionations. The inhibition (%) of T. recurvata seed germination was determined for each resulting fractions. Using gas chromatography-mass spectrometry (GCMS), the components of primary fraction with the highest inhibition were analyzed, as well as secondary fractions derived from this primaryfraction. The primary fraction G (CH2Cl2:AcOEt (v/v 1:1)) had the highest inhibitory effects on T. recurvata seed germination. The secondary fractions Gl (Hex:CH2Cl2 (mean concentration v/v 3:7)), G5 (CH2:C12:AcOEt (v/v 7:3)) and G7 (MeOH) were most inhibitory. Among the compounds of active primary fraction and secondary fractions G5 and G7, 7-hexadecanoic acid were identified as compounds with -possible allelopathic activity. However, these were not present in secondary fraction Gl, it had the allelochemical 3,7,11,15-tetramethyl-2-hexadecen-1-ol. Results indicated that there were three active secondary fractions with different chemical composition but none of these inhibited the seed germination of T. recurvata. The inhibitory effects of dichloromethane extract of I. murucoides tends to diminish with fractionation, it is possible that the activity of components may be greater when they act together than when they act individually, However, further research is needed in this direction. 收起