Ecological Entomology (2012) 37, 293-299
Charles-Antoine Dedryver, Jean-François Le Gallic, Frédérique Mahéo, Nicolas Parisey and Denis Tagu (2012)
Delayed setting of the photoperiodic response in recombinant clones of the aphid species Sitobion avenae
Ecological Entomology 37 (4), 293-299
Abstract: 1. To explore the possible causes of apparent changes in reproductive mode from obligate to cyclical parthenogenesis over time in recombinant clones of the aphid Sitobion avenae Fabricius, all F1 progenies from various crosses were tested for several consecutive years for sexual morph production, after several weeks' exposure to a short photoperiod.
2. Variable proportions of the F1 progenies from selfing and outcrossing holocyclic clones did not produce mating females when induction was attempted in the year of hatching, but only after further induction, the following year or after. This 'delayed setting of the photoperiodic response' (DSPR) was much stronger in recombinants from crosses involving only clones from oceanic regions than in those involving one clone from a region with a continental climate.
3. F1 progenies resulting from crosses between one holocyclic and one intermediate clone did not show DSPR. It appeared again in the F2.
4. DSPR preferentially affected the latest hatched clones in a given progeny.
5. This phenomenon is neither an experimental artefact nor as a result of clone contamination. It appears to be because of a genetically controlled quantitative trait affecting the length of the 'interval timer', and may represent an adaptation of holocyclic aphid clones from oceanic regions to unpredictable winter climates.
(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): Charles-Antoine Dedryver
Research topic(s) for pests/diseases/weeds:
general biology - morphology - evolution
Pest and/or beneficial records:
| Beneficial | Pest/Disease/Weed | Crop/Product | Country | Quarant.
|
|---|---|---|---|---|
| Sitobion avenae |
