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  Host plant specialization in the generalist moth Heliothis virescens and the role of egg imprinting

Karpinski, A., Hänniger, S., Schöfl, G., Heckel, D. G., & Groot, A. T. (2014). Host plant specialization in the generalist moth Heliothis virescens and the role of egg imprinting. Evolutionary Ecology, 28, 1075-1093. doi:10.1007/s10682-014-9723-x.

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 Creators:
Karpinski, Anne1, 2, Author              
Hänniger, Sabine1, 2, Author              
Schöfl, Gerhard, Author
Heckel, David G.1, Author              
Groot, Astrid T.1, Author              
Affiliations:
1Department of Entomology, Prof. D. G. Heckel, MPI for Chemical Ecology, Max Planck Society, ou_421895              
2IMPRS on Ecological Interactions, MPI for Chemical Ecology, Max Planck Society, Jena, DE, ou_421900              

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 Abstract: Even though generalist insects are able to feed on many different host plants, local specialization may occur, which could lead to genetic differentiation. In this paper we assessed the level and extent of host plant specialization in the generalist herbivore Heliothis virescens Fabricius (Lepidoptera, Noctuidae). This generalist can grow and survive on many different plant species, belonging to more than 37 families. Previously, two laboratory strains were described that differ in their performance on cotton and chickpea. In this study we explored this phenomenon further. Specifically, we asked the following questions: (1) Do the two strains still differ in their performance on cotton and chickpea? Since we found that the most pronounced difference between the two strains was in their growth on fresh chickpea leaves, we then asked: (2) Does this variation in performance have a genetic basis? In our genetic analysis, we found that growth rates changed over time and that two linkage groups significantly affected the ability to grow on chickpea. One QTL was homologous to Bombyx mori chromosome 15, onto which genes for insecticide resistance and detoxicative enzymes have previously been mapped. (3) Is there a difference in oviposition preference between the two strains? Oviposition experiments revealed no preference in either strain when females were reared on the same artificial diet. However, we did find a maternal inheritance of oviposition preference: daughters collected as eggs from cotton oviposited significantly more eggs on cotton, and daughters collected as eggs from chickpea likewise laid more eggs on chickpea. Thus, Hopkins’ host selection principle seems to holds in this species, although imprinting seems to happen not at the larval but at the egg stage, which is a new finding. This study shows how genetic and nongenetic factors can interact to shape the patterns of local specialization in a generalist herbivore.

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 Dates: 2014-06-242014-07-012014
 Publication Status: Published in print
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 Identifiers: Other: HEC281
DOI: 10.1007/s10682-014-9723-x
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Title: Evolutionary Ecology
Source Genre: Journal
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Publ. Info: London : Chapman and Hall
Pages: - Volume / Issue: 28 Sequence Number: - Start / End Page: 1075 - 1093 Identifier: ISSN: 0269-7653
CoNE: https://pure.mpg.de/cone/journals/resource/954925501171