title: Cucurbitane glucosides from Momordica charantia leaves as oviposition deterrents to the leafminer, Liriomyza trifolii.
abstract: The American serpentine leaf mining fly, Liriomyza trifolii, whose larva feeds on more than 120 plant species is well characterized by its high degree of polyphagy. Observations on the oviposition behavior by L. trifolii demonstrated that among cucurbitaceous plants, Momordica charantia is rarely attacked by L. trifolii. The methanol extract of M. charantia leaves strongly deterred the females from ovipositing on kidney bean leaves treated at a concentration of 1 g leaf equivalent extract/ml. Analysis of the polar fraction of the methanol extract of M. charantia leaves resulted in the isolation of a novel cucurbitane glucoside, 7-O-beta-D-glucopyranosyl-3,23-dihydroxycucurbita-5,24-dien-19-al, named momordicine IV, along with another known compound, momordicine II. Momordicine II and IV deterred oviposition by L. trifolii significantly when bioassays were carried out on kidney bean leaves treated at 75.6 and 20.3 microg/cm2 leaf surface, respectively. There was no synergistic effect on oviposition deterrent when the two compounds were combined in their natural abundance.
authors.affiliation: Department of Bioresources Science, Faculty of Agriculture, Kochi University, B200 Monobe, Nankoku 783-8502, Japan. daniel_bisrat98@yahoo.com
authors.forename: Daniel Bisrat
authors.initials: DB
authors.lastname: Mekuria
authors.forename: Takehiro
authors.initials: T
authors.lastname: Kashiwagi
authors.forename: Shin-ichi
authors.initials: S
authors.lastname: Tebayashi
authors.forename: Chul-Sa
authors.initials: CS
authors.lastname: Kim
mesh_terms: D000596:Amino Acids / Q000302:isolation & purification / Q000494:pharmacology; D000818:Animals; D001181:Arthropods / Q000502:physiology*; D005260:Female; D005960:Glucosides / Q000302:isolation & purification / Q000494:pharmacology*; D029777:Momordica charantia / Q000737:chemistry* / Q000254:growth & development; D010058:Oviposition / Q000187:drug effects*; D018515:Plant Leaves / Q000737:chemistry
chemical_list: D000596:Amino Acids; D005960:Glucosides; C014427:cucurbitine