Ecological specialization of the aphid <i>Aphis gossypii</i> Glover on cultivated host plants

Molecular Ecology - Tập 18 Số 10 - Trang 2198-2212 - 2009
Jérôme Carletto1, Éric Lombaert2, P. Chavigny2, Thierry Brévault3, L. Lapchin2, Flavie Vanlerberghe‐Masutti2
1INRA, UMR 1301, Equipe Biologie des Populations en Interaction, Sophia Antipolis Cedex, France.
2INRA, UMR 1301, Equipe Biologie des Populations en Interaction, 400 Route des Chappes, BP 167, F‐06903 Sophia Antipolis cedex, France
3Irad‐Cirad, BP 1146 Garoua, Cameroon

Tóm tắt

AbstractMany plant‐feeding insect species considered to be polyphagous are in fact composed of genetically differentiated sympatric populations that use different hosts and between which gene flow still exists. We studied the population genetic structure of the cotton‐melon aphid Aphis gossypii that is considered as one of the most polyphagous aphid species. We used eight microsatellites to analyse the genetic diversity of numerous samples of A. gossypii collected over several years at a large geographical scale on annual crops from different plant families. The number of multilocus genotypes detected was extremely low and the genotypes were found to be associated with host plants. Five host races were unambiguously identified (Cucurbitaceae, cotton, eggplant, potato and chili‐ or sweet pepper). These host races were dominated by asexual clones. Plant transfer experiments using several specialized clones further confirmed the existence of host‐associated trade‐offs. Finally, both genetic and experimental data suggested that plants of the genus Hibiscus may be used as refuge for the specialized clones. Resource abundance is discussed as a key factor involved in the process of ecological specialization in A. gossypii.

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Thông tin
Thông tin xuất bản

Molecular Ecology

Tập 18 Số 10

2198-2212

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