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Evolution. 2016 Jun;70(6):1418-27. doi: 10.1111/evo.12940. Epub 2016 May 30.

A Z-linked sterility locus causes sexual abstinence in hybrid females and facilitates speciation in Spodoptera frugiperda.

Author information

1
Department of Entomology, Max Planck Institute for Chemical Ecology, Hans-Knöll-Strasse 8, 07749, Jena, Germany. skost@ice.mpg.de.
2
Department of Entomology, Max Planck Institute for Chemical Ecology, Hans-Knöll-Strasse 8, 07749, Jena, Germany.
3
Biology Centre CAS, Institute of Entomology, Laboratory of Molecular Cytogenetics, Branišovská 31, 370 05, České Budějovice, Czech Republic.
4
Institute for Biodiversity and Ecosystem Dynamics, University of Amsterdam, Science Park 904, 1098 XH, Amsterdam, The Netherlands.

Abstract

In the fall armyworm, Spodoptera frugiperda (Lepidoptera, Noctuidae), two sympatric strains have been recognized that have been termed corn strain (C) and rice strain (R), referring to their most common host plants. Both strains are reproductively isolated via a distinct prezygotic barrier as well as via an intriguing postzygotic phenomenon: when R females have mated with C males, the resulting RC hybrid females exhibit dramatically reduced fertility independent of their mating partner. Here, we demonstrate that the reduced fertility is caused by the fact that these females refrain from mating, that is, females are behaviorally sterile. We identified a Z-chromosomally linked sterility locus that is most likely incompatible with yet to be identified autosomal (or cytoplasmic) factors, leading to the observed sexual abstinence. Within-chromosome mapping revealed the sterility locus to be located in an area of strongly reduced interstrain recombination.

KEYWORDS:

Behavioral sterility; hybrid incompatibility; sex chromosomal-autosomal incompatibility; sex chromosome; unidirectional sterility

PMID:
27149933
DOI:
10.1111/evo.12940
[Indexed for MEDLINE]

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