title: Levels of a terpenoid glycoside (blumenin) and cell wall-bound phenolics in some cereal mycorrhizas.
abstract: Four cereals, Hordeum vulgare (barley), Triticum aestivum (wheat), Secale cereal (rye), and Avena sativa (oat), were grown in a defined nutritional medium with and without the arbuscular mycorrhizal fungus Glomus intraradices. Levels of soluble and cell wall-bound secondary metabolites in the roots of mycorrhizal and nonmycorrhizal plants were determined by high-performance liquid chromatography during the first 6 to 8 weeks of plant development. Whereas there was no difference in the levels of the cell wall-bound hydroxycinnamic acids, 4-coumaric and ferulic acids, there was a fungus-induced change of the soluble secondary root metabolites. The most obvious effect observed in all four cereals was the induced accumulation of a terpenoid glycoside. This compound was isolated and identified by spectroscopic methods (nuclear magnetic resonance, mass spectrometry) to be a cyclohexenone derivative, i.e. blumenol C 9-O-(2'-O-beta-glucuronosyl)-beta-glucoside. The level of this compound was found to be directly correlated with the degree of root colonization.
mesh_terms: D018554:Avena / Q000382:microbiology; D002236:Carbohydrate Conformation; D002240:Carbohydrate Sequence; D002473:Cell Wall / Q000737:chemistry; D003512:Cyclohexanones / Q000032:analysis* / Q000737:chemistry / Q000302:isolation & purification; D004187:Disaccharides / Q000032:analysis* / Q000737:chemistry / Q000302:isolation & purification; D002523:Edible Grain / Q000382:microbiology*; D001467:Hordeum / Q000382:microbiology; D008969:Molecular Sequence Data; D015394:Molecular Structure; D009090:Mucorales / Q000737:chemistry* / Q000302:isolation & purification; D010636:Phenols / Q000032:analysis*; D012434:Secale / Q000382:microbiology; D013729:Terpenes; D014908:Triticum / Q000382:microbiology
chemical_list: D003512:Cyclohexanones; D004187:Disaccharides; D010636:Phenols; D013729:Terpenes; C096644:blumenin