Über einige inhaltsstoffe der solanaceen und ihre bedeutung für die kartoffelkäferresistenz¹
1958
Schreiber, Klaus
A summary report is given of naturally occurring substances in plants which confer resistance to the Colorado potato beetle (Leptinotarsa decemlineata Say). Alkaloid-glycosides occurring in many Solanum and Lycopersicon varieties' are discussed in some detail, and results are reported of some recent investigations of the alkaloids in Solanum dulcamara, S. nigrum, S. polyadenium and Acaulia. An attempt is made to explain the mechanism by which these substances affect insects. The harmful effects of alkaloid-tetraosides of Solanum on the taste of fodder are attributed to biophysical processes, particularly to surface and interface phenomena. In addition it is assumed that the alkaloids in question induce a. blocking of the Steroide metabolism and affect the resorption of the phytosterines that are indispensable for the insects, thus explaining frequently observed disturbances in development and fertility.
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