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- W2324398045 abstract "Orobanche cumana is a serious threat for cultivation of sunflower in Europe and Asia. Germination of the parasite is induced by metabolites released from the host root system. The first germination stimulant from sunflower root exudate was recently identified as dehydrocostus lactone, a sesquiterpene lactone. Bioassay-guided fractionation of root exudates now showed the release of additional sesquiterpene lactones. Besides dehydrocostus lactone, costunolide, tomentosin, and 8-epixanthatin were purified and identified spectroscopically. All four compounds induced germination of O. cumana at nano- to micromolar concentrations. Costunolide and dehydrocostus lactone concentrations above 1 μM reduced the activity, and application of 100 μM inhibited germination irreversibly. Seeds of Phelipanche ramosa could not be induced with costunolide. O. cumana seeds also germinated with GR24, a synthetic strigolactone. No bioactive fraction of sunflower contained compounds of this type. This supports previous findings that sesquiterpene lactones instead of strigolactones trigger the sunflower/O. cumana interaction." @default.
- W2324398045 created "2016-06-24" @default.
- W2324398045 creator A5011133919 @default.
- W2324398045 creator A5091524199 @default.
- W2324398045 date "2013-10-24" @default.
- W2324398045 modified "2023-10-12" @default.
- W2324398045 title "New Sesquiterpene Lactones from Sunflower Root Exudate as Germination Stimulants for Orobanche cumana" @default.
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- W2324398045 doi "https://doi.org/10.1021/jf402392e" @default.
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