title: Cucurbitane triterpenoid oviposition deterrent from Momordica charantia to the leafminer, Liriomyza trifolii.
abstract: Females of Liriomyza trifolii, a polyphagous leafminer, are often deterred from ovipositing on Momordica charantia leaves. The methanol extract of M. charantia leaves showed strong oviposition deterrent activity against L. trifolii females on the host plant leaf when it was dipped in the methanol extract at a concentration of 1 g of fresh leaf equivalent/ml. Bioguided fractionation of the methanol extract of the leaves of M. charantia led to the isolation of a new cucurbitane triterpenoid, 7,23-dihydroxy-3-O-malonylcucurbita-5,24-dien-19-al, along with another known compound, momordicine I. Both 7,23-dihydroxy-3-O-malonylcucurbita-5,24-dien-19-al and momordicine I respectively had significant ovipositing deterrent effect towards the adult females of L. trifolii on host plant leaves treated at concentrations of 3.25 and 33.60 microg/cm2.
authors.affiliation: Department of Bioresources Science, Faculty of Agriculture, Kochi University, Japan.
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: D000818:Animals; D001681:Biological Assay; D004175:Diptera / Q000187:drug effects*; D005260:Female; D000432:Methanol / Q000737:chemistry; D029777:Momordica charantia / Q000737:chemistry*; D010058:Oviposition / Q000187:drug effects*; D027805:Phaseolus / Q000737:chemistry; D018515:Plant Leaves / Q000737:chemistry*; D013261:Sterols / Q000737:chemistry* / Q000494:pharmacology*; D014315:Triterpenes / Q000737:chemistry* / Q000494:pharmacology*
chemical_list: C506901:7,23-dihydroxy-3-O-malonylcucurbita-5,24-dien-19-al; D013261:Sterols; D014315:Triterpenes; C506900:momordicine I; D000432:Methanol