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The effect of host plants on genotype variability in fitness and honeydew composition of Aphis fabae

Insect Science 2017年第5期24卷 781-788页

作者： Sharon Schillewaert amelie vantaux Wim Van den Ende Tom Wenseleers Laboratory of Socioecology and Social Evolution Biology Department Zoological Institute University of Leuven Leuven Belgium Institut Pasteur du Cambodge Unite d'Epidemiologie Moleculaire du Paludisme Phnom Penh Cambodia Laboratory of Molecular Plant Biology Biology Department University of Leuven Leuven Belgium

Aphid species can be polyphagous, feeding on multiple host plants across genera. As host plant species can have large variation in their phloem composition, this can affect aphid fitness and honeydew composition. Previous research showed significant intraspecific genotype variation in the composition of the honeydew carbohydrates of the black bean aphid Aphis fabae, with the ant attractant trisaccharide melezitose showing especially large variation across different genotypes. In this study, we test if variation in melezitose and carbohydrate composition of aphid honeydew could be linked to the adap- tation of specific aphid genotypes to particular host plants. To this end, 4 high and 5 low melezitose secreting genotypes of the black bean aphid Aphisfabae were reared on 4 com- mon host plants： broad bean, goosefoot, beet, and poppy. The carbohydrate composition, and in particular melezitose secretion, showed important aphid genotype and host plant in- teractions, with some genotypes being high melezitose secreting on 1 host plant but not on another. However, the interaction effects were not paralleled in the fitness measurements, even though there were significant differences in the average fitness across the different host plants. On the whole, this study demonstrates that aphid honeydew composition is influenced by complex herbivore-plant interactions. We discuss the relevance of these findings in the context of ant-aphid mutualisms and adaptive specialization in aphids.

关键词： aphids Aphis fabae ecological specialization fitness honeydew hostplants Melezitose polyphagous

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