Acta Entomologica Sinica (2004) 47, 198-205

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Na Li, Ling Meng, Bao-Ping Zhai and Kong-Ming Wu (2004)
Fluctuating asymmetry in Helicoverpa armigera (Hübner) and Harmonia axyridis (Pallas) under the stress of Bt-transgenic cotton
Acta Entomologica Sinica 47 (2), 198-205
Abstract: The fluctuating asymmetry (FA) in response to the stress of Bt-transgenic cotton was estimated among the different symmetric characters in the cotton bollworm (Helicoverpa armigera, CB) and the Asian lady beetle (Harmonia axyridis, ALB) populations in the laboratory. The CB was reared on transgenic Bt cotton and the ALB was reared on aphids (Aphis gossypii) feeding on transgenic Bt cotton. The results indicated that FA was found in the fore femur, mid femur, hind femur, two vein sections L1 and L2 in the fore wing and the hind wing of the CB. The values of FA of the fore femur and hind wing were higher than those of the control population. Egg hatchability and adult longevity of the CB were significantly lower than those of the control population. The fitness and predatory function of the ALB were not affected by feeding on aphids on transgenic Bt cotton. FA in hind wing of the ALB was not significantly different with the control population. The investigation showed some positive relationship between FA and fitness of CB and ALB, but more studies will be needed to establish the correlation between FA and fitness of these species. The possibility using FA as a sensitive indicator of the ecological risk of genetically modified crops is discussed.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Database assignments for author(s): Bao Ping Zhai, Kong Ming Wu, Ling Meng

Research topic(s) for pests/diseases/weeds:
biocontrol - natural enemies
Research topic(s) for beneficials or antagonists:
environment/habitat manipulation

Pest and/or beneficial records:

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

Helicoverpa armigera Cotton (Gossypium)
Aphis gossypii
Harmonia axyridis (predator) Aphis gossypii Cotton (Gossypium)
Bacillus thuringiensis genes in crops (entomopathogen) Helicoverpa armigera Cotton (Gossypium)