title: Chemical defenses of Trifolium glanduliferum against redlegged earth mite Halotydeus destructor.
abstract: Trifolium glanduliferum Boiss. was resistant to redlegged earth mite, Halotydeus destructor Tucker (Acari: Penthaleidae), feeding compared with Trifolium subterraneum L. Extracts from T. glanduliferum leaves, obtained with dichloromethane and methanol, acted as feeding deterrents to the redlegged earth mite. Bioassay-directed fractionation of the extracts led to the isolation of several metabolites, coumarin, alpha-and beta-ionone, linalool, medicarpin, that were shown to be deterrent in laboratory experiments. The compounds contributing to the defense of T. glanduliferum were different from those influencing mite feeding on T. subterraneum leaves.
authors.affiliation: Centre for Legumes in Mediterranean Agriculture, Department of Chemistry, University of Western Australia, Nedlands, Western Australia 6907, Australia. swang@ccwa.wa.gov.au
authors.forename: S F
authors.initials: SF
authors.lastname: Wang
authors.forename: T J
authors.initials: TJ
authors.lastname: Ridsdill-Smith
authors.forename: E L
authors.initials: EL
authors.lastname: Ghisalberti
mesh_terms: D000818:Animals; D003374:Coumarins / Q000032:analysis; D035264:Flowers / Q000737:chemistry; D007306:Insecticides; D008752:Methylene Chloride; D008925:Mites; D045792:Norisoprenoids / Q000032:analysis; D010836:Phytol / Q000032:analysis; D010936:Plant Extracts / Q000737:chemistry; D018515:Plant Leaves / Q000737:chemistry; D029921:Trifolium / Q000737:chemistry*
chemical_list: D003374:Coumarins; D007306:Insecticides; D045792:Norisoprenoids; D010936:Plant Extracts; D010836:Phytol; D008752:Methylene Chloride; C030123:coumarin; C008157:beta-ionone