Role of Alkaloids in Resistance of Yellow Lupin to Red-Legged Earth Mite Halotydeus destructor |
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| Authors: | S F Wang A Y Liu T J Ridsdill-Smith E L Ghisalberti |
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| Affiliation: | (1) Cooperative Research Centre for Legumes in Mediterranean Agriculture. Department of Chemistry, University of Western Australia, Nedlands, Western Australia, 6907, Australia;(2) Cooperative Research Centre for Legumes in Mediterranean Agriculture, Agriculture Western Australia, Baron-Hay Court, South Perth, Western Australia, 6151, Australia;(3) Cooperative Research Centre for Legumes in Mediterranean Agriculture, CSIRO Entomology, Private Bag, PO Wembley, Western Australia, 6014, Australia |
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| Abstract: | Eleven varieties of Lupinus luteus were tested in choice and no-choice experiments for their resistance to feeding by the red-legged earth mite (Halotydeus destructor). Three were found to show resistance, and the alkaloid fraction from these varieties strongly deterred mites from feeding. The alkaloid components of the extracts, lupinine, a number of acyl derivatives of lupinine, and sparteine were tested for deterrent activity. Sparteine was the most potent, with significant activity at 0.001% concentration. Quantitation of the levels of nonpolar alkaloids in the cotyledons and leaves of the 11 varieties was by gas chromatography–mass spectrometry. An inverse correlation was found between the concentrations of these alkaloids and the damage caused by the mites; varieties with levels <100  g/g (fresh wt) showed a high damage index. The involvement of sparteine and the bipiperidine alkaloid ammodendrine in the deterrence to mite feeding is discussed. |
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| Keywords: | Lupinus luteus Halotydeus destructor plant resistance deterrent activity quinolizidine alkaloids ammodendrine |
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