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Host dependent iridoid glycoside sequestration patterns in Cionus hortulanus.

Christian Ulrich Baden¹, Stephan Franke, Susanne Dobler

¹Molecular Evolutionary Biology, Department of Biology, Hamburg University, Hamburg, Germany. baden@evolbio.mpg.de

Journal of Chemical Ecology

|July 13, 2013

Summary

Cionus hortulanus weevils

Area of Science:

Chemical ecology
Insect-plant interactions
Metabolic sequestration

Background:

Weevils in the genus Cionus sequester iridoid glycosides (IGs) from Scrophulariaceae plants.
Cionus hortulanus is unique in feeding on both Scrophularia and Verbascum genera.
Previous studies indicated host-dependent IG sequestration in C. hortulanus.

Purpose of the Study:

To determine if IG sequestration patterns in C. hortulanus are influenced by host plant availability or genetic population differences.
To investigate the metabolic plasticity of C. hortulanus in response to different host plants.

Main Methods:

Field collection of C. hortulanus from Scrophularia nodosa.
Laboratory rearing of collected weevils on either S. nodosa or Verbascum nigrum.

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Analysis of iridoid glycoside (aucubin and catalpol) concentrations in both host plants and weevils.

Main Results:

IG concentrations in C. hortulanus were host-plant specific, indicating metabolic adaptation rather than fixed genetic differences.
Weevils reared on S. nodosa showed higher aucubin than catalpol, mirroring their host plant.
Weevils reared on V. nigrum exhibited significantly higher concentrations of both aucubin and catalpol than their host, altering the catalpol to aucubin ratio.

Conclusions:

The host plant significantly influences the iridoid glycoside profiles of Cionus hortulanus.
Data contradict genetically fixed sequestration differences, supporting host-driven metabolic regulation.
C. hortulanus demonstrates metabolic flexibility in sequestering and potentially modifying iridoid glycosides based on dietary intake.