Abstract：
:Phytotoxicity-directed extraction and fractionation of the aerial parts of Mikania micrantha H.B.K. led to the isolation and identification of three sesquiterpenoids: dihydromikanolide, deoxymikanolide, and 2,3-epoxy-1-hydroxy-4,9-germacradiene-12,8:15,6-diolide. These sesquiterpenoids inhibited both germination and seedling growth of tested species with deoxymikanolide possessing the strongest phytotoxicity. In a bioassay against lettuce (Lectuca sativa L.), deoxymikanolide reduced radicle elongation at low concentration (IC50 = 47 microg/ml); dihydromikanolide showed a weaker effect (IC50 = 96 microg/ml), and 2,3-epoxy-1-hydroxy-4,9-germacradiene-12,8:15,6-diolide exhibited the least effect (IC50 = 242 microg/ml). Deoxymikanolide caused yellowish lesions at the root tips of lettuce at a concentration of 50 microg/ml, and a 250 microg/ml solution killed lettuce seedlings. A bioassay against the monocot ryegrass (Lolium multiforum) revealed similar results on radicle elongation, which implied that the growth inhibition by these compounds was not selective. To evaluate their phytotoxicity to plants in natural habitats, three common companion tree species in south China, Acacia mangium, Eucalyptus robusta, and Pinus massoniana, were also tested and similar results were obtained. This is the first report on the isolation of 2,3-epoxy-1-hydroxy-4,9-germacradiene-12,8:15,6-diolide as a naturally occurring product.
journal_name
J Chem Ecoljournal_title
Journal of chemical ecologyauthors
Shao H,Peng S,Wei X,Zhang D,Zhang Cdoi
10.1007/s10886-005-5805-0keywords:
subject
Has Abstractpub_date
2005-07-01 00:00:00pages
1657-68issue
7eissn
0098-0331issn
1573-1561journal_volume
31pub_type
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doi：10.1007/BF00990412
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pub_type： 杂志文章
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pub_type： 杂志文章
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更新日期：1981-07-01 00:00:00
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更新日期：2015-06-01 00:00:00
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pub_type： 杂志文章
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更新日期：2008-05-01 00:00:00
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pub_type： 杂志文章
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更新日期：1990-08-01 00:00:00
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更新日期：1987-04-01 00:00:00
