Genotype-by-genotype interactions modified by a third species in a plant-insect system

Catherine Tétard-Jones, Michael A. Kertesz, Patrick Gallois, Richard F. Preziosi

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    Community genetics examines how genotypic variation within a species influences the associated ecological community. The inclusion of additional environmental and genotypic factors is a natural extension of the current community genetics framework. However, the extent to which the presence of and genetic variation in associated species influences interspecific interactions (i.e., genotype x genotype x environment [G x G x E] interactions) has been largely ignored. We used a community genetics approach to study the interaction of barley and aphids in the absence and presence of rhizosphere bacteria. We designed a matrix of aphid genotype and barley genotype combinations and found a significant G x G x E interaction, indicating that the barley-aphid interaction is dependent on the genotypes of the interacting species as well as the biotic environment. We discuss the consequences of the strong G x G x E interaction found in our study in relation to its impact on the study of species interactions in a community context. © 2007 by The University of Chicago. All rights reserved.
    Original languageEnglish
    Pages (from-to)492-499
    Number of pages7
    JournalThe American naturalist
    Issue number3
    Publication statusPublished - Sept 2007


    • Community genetics
    • Indirect effects
    • Plant-insect interactions
    • Pseudomonas aeruginosa 7NSK2
    • Sitobion avenae
    • Species interactions


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