Unique sex chromosome mediated behavioral response specificity of hybrid male European corn borer moths

Glover, Thomas J.; Campbell, M. G.; Linn, Charles E.; Roelofs, Wendell L.

doi:10.1007/bf01929897

Cited by 16 publications

(25 citation statements)

References 20 publications

(1 reference statement)

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Section: Reproductive Isolation Between the Strainsmentioning

confidence: 98%

“…Glover et al (1991) reported that many hybrid males from reciprocal crosses failed to complete the behavioral sequence to locate a female, regardless of the blend they were exposed to. In addition, the few males that responded did not exhibit a preference for any particular blend but, rather, were attracted to a broad range of blends (Glover et al, 1991). Given that most hybrid males do not respond to any blend, and that the remaining ones are not tuned to any particular blend, F1 hybridization should be seen as a transient stage with a limited possibility of creating recurrent gene flow between the strains.…”

Section: Reproductive Isolation Between the Strainsmentioning

confidence: 98%

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Journey in the Ostrinia World: From Pest to Model in Chemical Ecology

Lassance

2010

J Chem Ecol

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The European corn borer Ostrinia nubilalis (ECB; Lepidoptera: Crambidae) is a widely recognized pest of agricultural significance over much of the northern hemisphere. Because of the potential value of pheromone-based control, there has been considerable effort devoted to elucidation of the ECB chemical ecology. The species is polymorphic regarding its female-produced pheromone. Partly because of this feature, over the years the ECB has become a model to study pheromone evolution. This review should assist in identifying new areas of pheromone research by providing an overview of the literature produced on this subject for the ECB since the late 1960's.

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Section: Reproductive Isolation Between the Strainsmentioning

confidence: 98%

Section: Reproductive Isolation Between the Strainsmentioning

confidence: 98%

Journey in the Ostrinia World: From Pest to Model in Chemical Ecology

Lassance

2010

J Chem Ecol

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“…data), and the Mediterranean region of Europe (Anglade and Stockel 1984). Limited gene flow between O. nubilalis pheromone races has been suggested from molecular analyses (Harrison and Vawter 1977;Card e et al 1978;Cianchi et al 1980;Glover et al 1991;Dopman et al 2005), laboratory choice tests (Liebherr and Roelofs 1975), and field collections of F 1 hybrid females that produce a 65:35 E11-to Z11-14:OAc ratio (Klun and Maini 1979;Roelofs et al 1985;Durant et al 1995).…”

Section: Introductionmentioning

confidence: 99%

Frequency of hybridization between Ostrinia nubilalis E‐and Z‐pheromone races in regions of sympatry within the United States

Coates

Johnson

Kim

et al. 2013

Ecology and Evolution

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Female European corn borer, Ostrinia nubilalis, produce and males respond to sex pheromone blends with either E-or Z-D11-tetradecenyl acetate as the major component. E-and Z-race populations are sympatric in the Eastern United States, Southeastern Canada, and the Mediterranean region of Europe. The E-and Z-pheromone races of O. nubilalis are models for incipient species formation, but hybridization frequencies within natural populations remain obscure due to lack of a high-throughput phenotyping method. Lassance et al. previously identified a pheromone gland-expressed fatty-acyl reductase gene (pgfar) that controls the ratio of D11-tetradecenyl acetate stereoisomers. We identified three single nucleotide polymorphism (SNP) markers within pgfar that are differentially fixed between E-and Z-race females, and that are ≥98.2% correlated with female pheromone ratios measured by gas chromatography. Genotypic data from locations in the United States demonstrated that pgfar-z alleles were fixed within historically allopatric Z-pheromone race populations in the Midwest, and that hybrid frequency ranged from 0.00 to 0.42 within 11 sympatric sites where the two races co-occur in the Eastern United States (mean hybridization frequency or heterozygosity (H O ) = 0.226 AE 0.279). Estimates of hybridization between the E-and Z-races are important for understanding the dynamics involved in maintaining race integrity, and are consistent with previous estimates of low levels of genetic divergence between E-and Z-races and the presence of weak prezygotic mating barriers.

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“…Both strains have an interspecific behavioral antagonist, ( Z )-9-tetradecenyl acetate (Z9-14:OAc) [3]. Female hybrids (ZxE and ExZ) produce an intermediate pheromone blend (35:65 Z:E) and hybrid males respond preferentially to such blends [4,5]. Where the two strains occur in sympatry, hybrids are found in low frequency, between 5-15% [6].…”

Section: Introductionmentioning

confidence: 99%

Inheritance of central neuroanatomy and physiology related to pheromone preference in the male European corn borer

et al. 2010

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BackgroundThe European corn borer (ECB), Ostrinia nubilalis, is a textbook example of pheromone polymorphism. Males of the two strains (Z and E) prefer opposite ratios of the two pheromone components, Z11- and E11-tetradecenyl acetate, with a sex-linked factor underlying this difference in preference. The male antennal lobes of the two strains contain a pheromone sensitive macroglomerular complex (MGC) that is identical in morphology, but reversed in functional topology. However, hybrids prefer intermediate ratios. How a topological arrangement of two glomeruli can accommodate for an intermediate preference was unclear. Therefore we studied the neurophysiology of hybrids and paternal backcrosses to see which factors correlated with male behavior.ResultsProjection neuron (PN) recordings and stainings in hybrids and backcrosses show a dominance of the E-type MGC topology, notwithstanding their intermediate preference. Apparently, the topological arrangement of glomeruli does not directly dictate preference. However, two other factors did correlated very well with preference. First, volumetric measurements of MGC glomeruli demonstrate that, whereas in the parental strains the medial MGC glomerulus is more than 2 times larger than the lateral, in hybrids they are intermediate between the parents, i.e. equally sized. Paternal backcrosses showed that the volume ratio is sex-linked and co-dominant. Second, we measured the summed potential difference of the antennae in response to pheromone stimulation using electroantennogram recordings (EAG). Z-strain antennae responded 2.5 times stronger to Z11 than to E11-14:OAc, whereas in E-strain antennae the ratio was approximately equal. Hybrid responses were intermediate to the parents, and also here the antennal response of the paternal backcrosses followed a pattern similar to the behavioral phenotype. We found no differences in frequency and types of projection and local interneurons encountered between the two strains and their hybrids.ConclusionsMale pheromone preference in the ECB strains serves as a strong prezygotic reproductive isolation mechanism, and has contributed to population divergence in the field. Our results demonstrate that male pheromone preference is not directly affected by the topological arrangement of olfactory glomeruli itself, but that male preference may instead be mediated by an antennal factor, which causes the MGC glomeruli to be differentially sized. We postulate that this factor affects readout of blend information from the MGC. The results are an illustration of how pheromone preference may be 'spelled out' in the ALs, and how evolution may modulate this.

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Unique sex chromosome mediated behavioral response specificity of hybrid male European corn borer moths

Cited by 16 publications

References 20 publications

Journey in the Ostrinia World: From Pest to Model in Chemical Ecology

Journey in the Ostrinia World: From Pest to Model in Chemical Ecology

Frequency of hybridization between Ostrinia nubilalis E‐and Z‐pheromone races in regions of sympatry within the United States

Inheritance of central neuroanatomy and physiology related to pheromone preference in the male European corn borer

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