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Am Nat. 2007 Sep;170(3):492-9. Epub 2007 Jul 20.

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

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1
Faculty of Life Sciences, University of Manchester, Oxford Road, Manchester M13 9PT, United Kingdom. catherine.tetard-jones@manchester.ac.uk

Abstract

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.

PMID:
17879200
DOI:
10.1086/520115
[Indexed for MEDLINE]
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