title: A Potent Phytotoxic Substance in Aglaia odorata Lour.
abstract: Aglaia odorata Lour. (Meliaceae) was found to have very strong allelopathic activity and a bioherbicide PORGANIC(™) was developed from its leaf extracts. However, the phytotoxic substances causing the strong allelopathic activity of the plants have not yet been determined. Therefore, we investigated allelopathic properties and phytotoxic substances in A. odorata. Aqueous EtOH extracts of A. odorata leaves inhibited root and shoot growth of garden cress (Lepidum sativum), lettuce (Lactuca sativa), alfalfa (Medicago sativa), timothy (Phleum pratense), ryegrass (Lolium multiflorum), and Echinochloa crus-galli with the extract concentration-dependent manner. The extracts were then purified and a major phytotoxic substance with allelopathic activity was isolated and identified by spectral data as rocaglaol. Rocaglaol inhibited the growth of garden cress and E. crus-galli at concentrations > 0.3 and 0.03 μm, respectively. The concentrations required for 50% inhibition ranged from 0.09 to 2.5 μm. The inhibitory activity of rocaglaol on the weed species, E. crus-galli, was much greater than that of abscisic acid. These results suggest that rocaglaol may be a major contributor to the allelopathic effect of A. odorata and bioherbicide PORGANIC(™) .
authors.affiliation: Department of Applied Biological Science, Faculty of Agriculture, Kagawa University, Miki, Kagawa, 761-0795, Japan. hisashi@ag.kagawa-u.ac.jp.
authors.forename: Hisashi
authors.initials: H
authors.lastname: Kato-Noguchi
authors.affiliation: Department of Applied Biological Science, Faculty of Agriculture, Kagawa University, Miki, Kagawa, 761-0795, Japan.
authors.forename: Masahiko
authors.initials: M
authors.lastname: Suzuki
authors.affiliation: Department of Applied Biological Science, Faculty of Agriculture, Kagawa University, Miki, Kagawa, 761-0795, Japan.
authors.forename: Kazutaka
authors.initials: K
authors.lastname: Noguchi
authors.affiliation: Department of Chemistry, Faculty of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku, Yokohama, 223-8522, Japan.
authors.forename: Osamu
authors.initials: O
authors.lastname: Ohno
authors.affiliation: Department of Chemistry, Faculty of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku, Yokohama, 223-8522, Japan.
authors.forename: Kiyotake
authors.initials: K
authors.lastname: Suenaga
authors.affiliation: Department of Plant Production Technology, Faculty of Agricultural Technology, King Mongkut's Institute of Technology Ladkrabang, Bangkok, 10520, Thailand.
authors.forename: Chamroon
authors.initials: C
authors.lastname: Laosinwattana
mesh_terms: D031602:Aglaia / Q000737:chemistry*; D001572:Benzofurans / Q000737:chemistry / Q000302:isolation & purification / Q000494:pharmacology*; D004305:Dose-Response Relationship, Drug; D031747:Echinochloa / Q000187:drug effects* / Q000254:growth & development; D031220:Lepidium sativum / Q000187:drug effects* / Q000254:growth & development; D008968:Molecular Conformation; D010936:Plant Extracts / Q000737:chemistry*; D018515:Plant Leaves / Q000737:chemistry*
chemical_list: D001572:Benzofurans; D010936:Plant Extracts; C510144:rocaglaol
keywords: Aglaia; Allelopathy; Bioherbicide; Growth inhibitor; Meliaceae; Rocaglaol