期刊
JOURNAL OF CHEMICAL ECOLOGY
卷 35, 期 5, 页码 533-541出版社
SPRINGER
DOI: 10.1007/s10886-009-9632-6
关键词
Aphids; Schizaphis graminum; Trichoderma citrinoviride; Bisorbicillinoids; Bislongiquinolide and 16,17-dihydrobislongiquinolide; Trichodimerol; Dihydrotrichodimerol; Feeding preference; Electrophysiological tests; Biocontrol
资金
- Italian Ministry of University and Research (MIUR)
We report the effects of some bisorbicillinoids isolated from biomass of the fungus Trichoderma citrinoviride on settling and feeding preference of the aphid Schizaphis graminum. Purification of the fungal metabolites was carried out by a combination of column chromatography and thin-layer chromatography using direct and reverse phases. Chemical identification was performed by spectroscopic methods including nuclear magnetic resonance and mass spectrometry. The identified bisorbicillinoids appeared to be bislongiquinolide, its 16,17-dihydro derivative, trichodimerol, and dihydrotrichodimerol. A feeding preference test with alate morphs of S. graminum was used to identify the active fractions. Among the four bisorbicillinoids, dihydrotrichodimerol and bislongiquinolide influenced aphid feeding preference, restraining specimens from settling on leaves treated with metabolites. Taste neurons sensitive to these compounds, particularly to bislongiquinolide, were located on tarsi of the S. graminum alate morphs.
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