germacrene a/helianthus

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Identification and functional characterization of a new sunflower germacrene A synthase (HaGAS3).

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Sesquiterpenes and sesquiterpene lactones are major natural compounds found in linear and capitate glandular trichomes of sunflower, Helianthus annuus L. In addition to two recently identified germacrene A synthases HaGAS1 and HaGAS2, found in capitate trichome gland cells, reverse transcription-PCR

Identification, functional characterization and developmental regulation of sesquiterpene synthases from sunflower capitate glandular trichomes.

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BACKGROUND Sesquiterpene lactones are characteristic metabolites of Asteraceae (or Compositae) which often display potent bioactivities and are sequestered in specialized organs such as laticifers, resin ducts, and trichomes. For characterization of sunflower sesquiterpene synthases we employed a

Lettuce costunolide synthase (CYP71BL2) and its homolog (CYP71BL1) from sunflower catalyze distinct regio- and stereoselective hydroxylations in sesquiterpene lactone metabolism.

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Sesquiterpene lactones (STLs) are terpenoid natural products possessing the γ-lactone, well known for their diverse biological and medicinal activities. The occurrence of STLs is sporadic in nature, but most STLs have been isolated from plants in the Asteraceae family. Despite the implication of the

Localization of sesquiterpene lactone biosynthesis in cells of capitate glandular trichomes of Helianthus annuus (Asteraceae).

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Capitate glandular trichomes (CGT) of sunflower, Helianthus annuus, synthesize bioactive sesquiterpene lactones (STLs) within a short period of only a few days during trichome development. In the current project, the subcellular localization of H. annuus germacrene A monooxygenase (HaGAO), a key

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