Assessing the effects of Bt maize on the non-target pest Rhopalosiphum maidis by demographic and life-history measurement endpoints
| Autor: | Giovanni Burgio, Antonino Staiano, Francesco Camastra, Valeria Bregola, Giovanni Dinelli, Angelo Ciaramella, Alberto Lanzoni, Sara Bosi |
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| Přispěvatelé: | Lanzoni A., Bosi S., Bregola V., Camastra F., Ciaramella A., Staiano A., Dinelli G., Burgio G. |
| Jazyk: | angličtina |
| Rok vydání: | 2022 |
| Předmět: |
0106 biological sciences
individual-based approach pleiotropic effects Genetically modified crops demographic analysi 01 natural sciences secondary plant metabolite Lepidoptera genitalia transgenic Bt maize Bacillus thuringiensis Age-classified population projection matrix Beneficial insects life table response experiments life table response experiment life table parameters secondary plant metabolites individual fitne life table parameter Aphid Genetically modified maize biology Rhopalosiphum maidis fungi food and beverages Cry1Ab toxin demographic analysis individual fitness non-target pests General Medicine biology.organism_classification 010602 entomology Rhopalosiphum maidi Agronomy non-target pest pleiotropic effect Insect Science PEST analysis Agronomy and Crop Science 010606 plant biology & botany |
| Popis: | The most commercialized Bt maize plants in Europe were transformed with genes which express a truncated form of the insecticidal delta-endotoxin (Cry1Ab) from the soil bacterium Bacillus thuringiensis (Bt) specifically against Lepidoptera. Studies on the effect of transgenic maize on non-target arthropods have mainly converged on beneficial insects. However, considering the worldwide extensive cultivation of Bt maize, an increased availability of information on their possible impact on non-target pests is also required. In this study, the impact of Bt-maize on the non-target corn leaf aphid, Rhopalosiphum maidis, was examined by comparing biological traits and demographic parameters of two generations of aphids reared on transgenic maize with those on untransformed near-isogenic plants. Furthermore, free and bound phenolics content on transgenic and near-isogenic plants were measured. Here we show an increased performance of the second generation of R. maidis on Bt-maize that could be attributable to indirect effects, such as the reduction of defense against pests due to unintended changes in plant characteristics caused by the insertion of the transgene. Indeed, the comparison of Bt-maize with its corresponding near-isogenic line strongly suggests that the transformation could have induced adverse effects on the biosynthesis and accumulation of free phenolic compounds. In conclusion, even though there is adequate evidence that aphids performed better on Bt-maize than on non-Bt plants, aphid economic damage has not been reported in commercial Bt corn fields in comparison to non-Bt corn fields. Nevertheless, Bt-maize plants can be more easily exploited by R. maidis, possibly due to a lower level of secondary metabolites present in their leaves. The recognition of this mechanism increases our knowledge concerning how insect-resistant genetically modified plants impact on non-target arthropods communities, including tritrophic web interactions, and can help support a sustainable use of genetically modified crops. |
| Databáze: | OpenAIRE |
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