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Costs and benefits of tritrophic signalling between plants and parasitoids
Project responsable Ted Turlings
   
Team member Solène Guenat
Nathalie Veyrat

Nicolas Foresti
Julia Bilat
Thierry Arnet
Neil Villard

Zully Lopez Guevara
Christelle Guinand
Yibeltal Amare
Dylan Tatti

Lila ThiÉBaud
Gauthier Sandoz
Thomas Degen

Harmony Yersin
Lamilà Demarta
Camille Bugnon
Géraldine Buttet
Stéphanie Mercier
Gwladys Doyen
Coraline Sahin
   
Abstract When plants are attacked by arthropod herbivores they actively emit volatile substances that attract natural enemies of the herbivores. It is generally assumed that these herbivore-induced volatiles function as indirect defense signals and several field studies have provided evidence that the volatiles contribute to enhanced mortality of herbivores. Yet, skepticism persists among some scientists concerning the benefits that the plants derive from attracting natural enemies, especially where it concerns the attraction of parasitoids. It is also often criticized that the function of herbivore-induced volatiles is mostly studied in systems that involve cultivated plants and natural systems have rarely been investigated. For the current project we will study the plant teosinte and associated insects in their natural environment in Mexico. Teosinte is the wild ancestor of maize and maize is the best-studied plant in the context of tritrophic interactions. We will use our knowledge of the genetic and chemical mechanisms of these interactions in the cultivated system to study the same interactions in teosinte in order to address our general hypothesis that inducible volatiles attract parasitoids and thereby reduce herbivore damage and increase plant fitness. The aim is to provide the first evidence from nature for the adaptive role of volatile plant signals in recruiting natural enemies of herbivores.
   
Keywords tritrophic interactions, plant-insect interactions, parasitoids, induced plant volatiles
   
Type of project Fundamental research project
Research area Ecologie
Method of financing FNS - Encouragement de projets (Div. I-III)
Status Completed
Start of project 1-10-2008
End of project 30-9-2012
Overall budget 529'500.00
Additional info http://p3.snf.ch/projects-122132#
Contact Ted Turlings