title: Exudation of allelopathic substances in buckwheat (Fagopyrum esculentum Moench).
abstract: Root exudates of the common buckwheat, especially phenolic compounds, were studied. Their contents, both in the soil during the growing season and in agar medium during germination, were determined by HPLC and GC-MS. The allelopathic activity of the soil from a buckwheat stand was evaluated, as well. Palmitic acid, squalene, epicatechin, vitexin, a gallic acid derivative, and a quercetin derivative were the main compounds of the agar medium. In the soil, palmitic acid methyl ester, vanillic acid, rutin, a gallic acid derivative, and a 4-hydroxyacetophenone derivative were identified. The effects of vitexin, squalene, epicatechin, 4-hydroxyacetophenone, and vanillic and gallic acids were tested on eight plant species. Inhibitive effects were observed in the cases of 4-hydroxyacetophenone and vanillic and gallic acids. Comparisons of the identified compounds and inhibitive effects of soil extracts indicated that palmitic acid and the gallic acid derivative probably have an important function in the allelopathic root response of buckwheat.
authors.affiliation: Faculty of Agriculture, University of South Bohemia, Studentska 13, 37005 Ceske Budejovice, Czech Republic. janak@zf.jcu.cz
authors.forename: Jana
authors.initials: J
authors.lastname: Kalinova
authors.forename: Nadezda
authors.initials: N
authors.lastname: Vrchotova
authors.forename: Jan
authors.initials: J
authors.lastname: Triska
mesh_terms: D019612:Fagopyrum / Q000254:growth & development; D005707:Gallic Acid / Q000378:metabolism / Q000494:pharmacology; D019308:Palmitic Acid / Q000378:metabolism / Q000494:pharmacology; D010636:Phenols / Q000378:metabolism / Q000494:pharmacology; D010937:Plant Growth Regulators / Q000032:analysis / Q000378:metabolism* / Q000494:pharmacology; D018517:Plant Roots / Q000737:chemistry / Q000378:metabolism*; D012987:Soil / Q000032:analysis
chemical_list: D010636:Phenols; D010937:Plant Growth Regulators; D012987:Soil; D019308:Palmitic Acid; D005707:Gallic Acid