Wounding-Induced Increase of Quinolizidine Alkaloid Accumulation in Lupin Leaves

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Abstract
Cutting-up leaflets of Lupinus polyphyllus induces a rapid increase of quinolizidine alkaloid accumulation of up to 400% within 2 to 4.5 h. In contrast to the diurnal alkaloid formation, this reaction takes place both in the light and the dark and even at 4°C. The effect is reduced in chloramphenicol-treated samples but unimpaired in cycloheximide-treated assays. Since quinolizidine alkaloids constitute probably an important means of a chemical defense system of lupins against microbes and herbivores, the wound-induction of alkaloid accumulation is discussed as a defense responsf

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