title: Accumulation of apocarotenoids in mycorrhizal roots of Ornithogalum umbellatum.
abstract: Colonization of roots of Ornithogalum umbellatum by the arbuscular mycorrhizal fungus Glomus intraradices induced the accumulation of different types of apocarotenoids. In addition to the mycorrhiza-specific occurrence of cyclohexenone derivatives and the "yellow pigment" described earlier, free mycorradicin and numerous mycorradicin derivatives were detected in a complex apocarotenoid mixture for the first time. From the accumulation pattern of the mycorradicin derivatives their possible integration into the continuously accumulating "yellow pigment" is suggested. Structure analyses of the cyclohexenone derivatives by MS and NMR revealed that they are mono-, di- and branched triglycosides of blumenol C, 13-hydroxyblumenol C, and 13-nor-5-carboxy-blumenol C, some of which contain terminal rhamnose as sugar moiety.
authors.affiliation: Department of Secondary Metabolism, Leibniz Institute of Plant Biochemistry, Weinberg 3, D-06120 Halle (Saale), Germany. willibald.schliemann@ipb-halle.de
authors.forename: Willibald
authors.initials: W
authors.lastname: Schliemann
authors.forename: Jürgen
authors.initials: J
authors.lastname: Schmidt
authors.forename: Manfred
authors.initials: M
authors.lastname: Nimtz
authors.forename: Victor
authors.initials: V
authors.lastname: Wray
authors.forename: Thomas
authors.initials: T
authors.lastname: Fester
authors.forename: Dieter
authors.initials: D
authors.lastname: Strack
mesh_terms: D002338:Carotenoids / Q000096:biosynthesis*; D003512:Cyclohexanones / Q000737:chemistry / Q000378:metabolism; D007700:Kinetics; D009682:Magnetic Resonance Spectroscopy; D013058:Mass Spectrometry; D015394:Molecular Structure; D038821:Mycorrhizae / Q000737:chemistry / Q000378:metabolism*; D031442:Ornithogalum / Q000737:chemistry / Q000378:metabolism*; D010860:Pigments, Biological / Q000096:biosynthesis; D018517:Plant Roots / Q000737:chemistry / Q000378:metabolism* / Q000382:microbiology*
chemical_list: D003512:Cyclohexanones; D010860:Pigments, Biological; D002338:Carotenoids