Herbivory meets fungivory: insect herbivores feed on plant pathogenic fungi for their own benefit

Franziska Eberl, Maite Fernandez de Bobadilla, Michael Reichelt, Almuth Hammerbacher, Jonathan Gershenzon, Sybille B. Unsicker*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

Plants are regularly colonised by fungi and bacteria, but plant-inhabiting microbes are rarely considered in studies on plant–herbivore interactions. Here we show that young gypsy moth (Lymantria dispar) caterpillars prefer to feed on black poplar (Populus nigra) foliage infected by the rust fungus Melampsora larici-populina instead of uninfected control foliage, and selectively consume fungal spores. This consumption, also observed in a related lepidopteran species, is stimulated by the sugar alcohol mannitol, found in much higher concentration in fungal tissue and infected leaves than uninfected plant foliage. Gypsy moth larvae developed more rapidly on rust-infected leaves, which cannot be attributed to mannitol but rather to greater levels of total nitrogen, essential amino acids and B vitamins in fungal tissue and fungus-infected leaves. Herbivore consumption of fungi and other microbes may be much more widespread than commonly believed with important consequences for the ecology and evolution of plant–herbivore interactions.

Original languageEnglish
Pages (from-to)1073-1084
JournalEcology Letters
Volume23
Issue number7
Early online date19 Apr 2020
DOIs
Publication statusPublished - Jun 2020

Keywords

  • gypsy moth
  • mycophagy
  • nutritional ecology
  • rust fungus
  • Salicaceae
  • tripartite interaction

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