Proceedings of the Royal Society of London. Series B, Biological Sciences (2014) 281 (1779 - 20133054)

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Astrid T. Groot, Gerhard Schöfl, Ollie Inglis, Susanne Donnerhacke, Alice Classen, Antje Schmalz, Richard G. Santangelo, Jennifer Emerson, Fred Gould, Coby Schal and David G. Heckel (2014)
Within-population variability in a moth sex pheromone blend: genetic basis and behavioural consequences
Proceedings of the Royal Society of London. Series B, Biological Sciences 281 (1779 - 20133054)
Abstract: Evolutionary diversification of sexual communication systems in moths is perplexing because signal and response are under stabilizing selection in many species, and this is expected to constrain evolutionary change. In the moth Heliothis virescens, we consistently found high phenotypic variability in the female sex pheromone blend within each of four geographically distant populations. Here, we assess the heritability, genetic basis and behavioural consequences of this variation. Artificial selection with field-collected moths dramatically increased the relative amount of the saturated compound 16:Ald and decreased its unsaturated counterpart Z11-16:Ald, the major sex pheromone component (high line). In a cross between the high- and low-selected lines, one quantitative trait locus (QTL) explained 11-21% of the phenotypic variance in the 16:Ald/Z11-16:Ald ratio. Because changes in activity of desaturase enzymes could affect this ratio, we measured their expression levels in pheromone glands and mapped desaturase genes onto our linkage map. A delta-11-desaturase had lower expression in females producing less Z11-16:Ald; however, this gene mapped to a different chromosome than the QTL. A model in which the QTL is a trans-acting repressor of delta-11 desaturase expression explains many features of the data. Selection favouring heterozygotes which produce more unsaturated components could maintain a polymorphism at this locus.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Link to article at publishers website
Database assignments for author(s): Astrid T. Groot, Coby Schal, David G. Heckel

Research topic(s) for pests/diseases/weeds:
pheromones/attractants/traps


Pest and/or beneficial records:

Beneficial Pest/Disease/Weed Crop/Product Country Quarant.


Chloridea virescens