Activity of quinolizidine alkaloids from three Mexican <Emphasis Type="Italic">Lupinus</Emphasis> against the lepidopteran crop pest <Emphasis Type="Italic">Spodoptera frugiperda</Emphasis> |
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Authors: | Kalina Bermúdez-Torres Jorge Martínez Herrera Rodolfo Figueroa Brito Michael Wink Luc Legal |
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Institution: | (1) Instituto Politécnico Nacional, CEPROBI, Yautepec, Morelos, Mexico;(2) University of Heidelberg, Heidelberg, Germany;(3) ECOLAB, UMR 5245, University Paul Sabatier, Toulouse, France;(4) ECOLAB, Bat IVR3, 118, Route de Narbonne, 31062 Toulouse Cedex 9, France |
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Abstract: | Bitter lupins (Lupinus spp.) are not used as a protein source because of their toxicity. However, they may have alternative uses as potential sources
of natural insecticides. Quinolizidine alkaloids (QA) of three Mexican Lupinus species (Fabaceae): L. montanus (HBK),
L. stipulatus (Agardh) and L. aschenbornii (Schauer), were analyzed by capillary Gas Chromatography-Mass Spectrometry. Sparteine was found in high amounts in both L. montanus and L. aschenbornii while the major alkaloids in L. stipulatus extract were aphylline and an epiaphylline-like compound. Alkaloid extracts were tested for their insecticidal activity using
larvae of the Fall Armyworm, Spodoptera frugiperda (Smith); (Lepidoptera, Noctuidae) as a model pest. We compared LD50 values and mean weight of caterpillars fed with alkaloid extracts of the three species studied with those of sparteine, a
widespread QA found in various lupin species. Extracts of L. montanus and L. aschenbornii were found to be as effective as sparteine and extracts L. stipulatus were found to be the most toxic against the larvae of S. frugiperda. This suggests that the various QA act differently on caterpillars, and could be used to control Spodoptera populations.
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Keywords: | Lupinus montanus Lupinus stipulatus Lupinus aschenbornii Sparteine Insecticidal activity Botanical insecticides |
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