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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Entomologia experimentalis et applicata 4 (1961), S. 133-142 
    ISSN: 1570-7458
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Summary Different Solanum alkaloids (crystallized samples of solanine, chaconine, leptine I, leptinine I, leptinine II, demissine and tomatine, and an amorphous sample of leptine III) were examined by a feeding-test in the Colorado beetle. All were found to discourage uptake of food. The resistance of Solanum chacoense against Leptinotarsa is due to its content of leptines. Leptines are transformed into leptinines by loss of the acetyl group. They lose their high activity in this process. Beetles resistant to DDT are less sensitive towards Solanum chacoense, leptines and leptinines than normal beetles.
    Notes: Zusammenfassung Die kristallisierten Solanum-Alkaloidglykoside (Solanin, Chaconin, Leptinin I, Leptinin II, Leptin I, Demissin und Tomatin) und ein amorphes Leptin III — Präparat wurden im Fraßtest an Kartoffelkäfern geprüft. Die Resistenz von Solanum “chacoense” gene Leptinotarsa kann durch den Gehalt an Leptinen erklärt werden. Die Leptine gehen unter Abspaltung der Acetylgruppe in die Leptinine über und verlieren damit ihre hohe fraßabschreckende Wirksamkeit. DDT-resistente Käfer sind gegen Solanum chacoense, die Leptine und die Leptinine unempfindlicher als normale.
    Type of Medium: Electronic Resource
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