Cry1Ab protein levels in phytophagous insects feeding on transgenic corn: implications for secondary exposure risk assessment

By G. Head, C. Brown, Mark E. Groth, J. Duan. 2001

162 citations recorded by the source corpus.

Subfields: Molecular Biology, Plant Science

View Paper: https://www.semanticscholar.org/paper/7d626b43c8398c6772953f6231e106f41d194297

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Molecular Biology

1. Jörg Romeis
2. S. Naranjo
3. M. Meissle
4. Franz Bigler
5. L. B. Obrist
6. Ramon Albajes
7. A. Dutton
8. J. Torres

In Plant Science

1. Jörg Romeis
2. M. Meissle
3. Ramon Albajes
4. Franz Bigler
5. J. Ruberson
6. S. Naranjo
7. J. Torres
8. A. Dutton

Citations in the corpus

• GENETICALLY ENGINEERED ORGANISMS AND THE ENVIRONMENT: CURRENT STATUS AND RECOMMENDATIONS1 (2005, background): “Prey insects vary in how much Bt toxin they assimilate (Head et al. 2001); therefore, the abundance and diversity of prey insects as well as an insect predator’s foraging preferences will affect the results of Bt studies carried out under field conditions.”
• Expression of Bacillus thuringiensis Cry1Ac protein in cotton plants, acquisition by pests and predators: a tritrophic analysis (2006, background): “The risk of Bt protein exposure to predators and parasitoids has been studied in transgenic corn under controlled conditions ( Hilbeck et al. , 1999; Head et al. , 2001; Raps et al. , 2001; Dutton et al. , 2002 ).”
• Abundance of non-target pests in transgenic Bt-maize: A farm scale study (2005, background): “It is difficult to assign causes for the greater abundance of aphids on Bt plants, as the Bt-toxin is not transported in the phloem (Head et al., 2001; Raps et al., 2001; Dutton et al., 2002).”
• Arthropod Abundance and Diversity in Bt and Non-Bt Cotton Fields (2004, background): “In contrast, high amounts of Bt toxin occurred in the guts of chewingherbivores on Bt corn (Head et al. 2001, Dutton et al. 2002).”
• Evaluation of dietary effects of transgenic corn pollen expressing Cry3Bb1 protein on a non‐target ladybird beetle, Coleomegilla maculata (2002, background): “Recent studies indicate that levels of the Cry protein in phytophagous insects feeding on Bt crops (if any) are usually many times lower than in the Bt corn plants, and aphids (phloem feeders) do not pick up plant-produced Cry protein when feeding on Bt plants (Head et al., 2001; Dutton, 2002).”
• Exposure of arthropod predators to Cry1Ab toxin in Bt maize fields (2006, background): “Laboratory studies with herbivores feeding on Cry1Ab expressing Bt maize revealed large differences in the quantity of ingested toxin among species (Head et al., 2001; Raps et al., 2001; Obrist et al., 2005).”
• The multicolored Asian lady beetle, Harmonia axyridis: A review of its biology, uses in biological control, and non-target impacts (2003, background): “Natural enemies may be exposed to the toxins of the transgenic plant through consumption of plant tissues (e.g., Lundgren and Wiedenmann, 2002) or through consumption of prey that have previously fed on transgenic plants (e.g., Head et al., 2001).”
• Ecological compatibility of GM crops and biological control (2009, unknown): “For instance, Cry toxins are not found in the phloem tissues of some maize events (Head et al., 2001), but these toxins are detectable in the phloem of some rice, oilseed rape, and other maize events (Raps et al.”
• Impact of farm-scale Bt maize on abundance of predatory arthropods in Spain (2005, background): “This might be related to the inability of aphids to acquire the Bt toxin through Bt maize (Head et al., 2001; Raps et al., 2001) or to their extremely low level of acquisition (Dutton et al.”
• Non‐target risk assessment of Bt crops – Cry protein uptake by aphids (2011, background): “135 (2011) 1–6 ª 2010 Blackwell Verlag, GmbH plant material (e.g. Head et al. 2001; Dutton et al. 2002; Harwood et al. 2005; Vojtech et al. 2005; Obrist et al. 2006a,b; Torres et al. 2006; Torres and Ruberson 2008; Meissle and Romeis 2009a).”
• Biological Activity of Cry1Ab Toxin Expressed by Bt Maize Following Ingestion by Herbivorous Arthropods and Exposure of the Predator Chrysoperla carnea (2006, methodology): “For Bt maize, it has been shown that different herbivorous arthropod species ingest variable amounts of Cry1Ab toxin (Head et al., 2001; Raps et al., 2001; Obrist et al., 2005).”
• Another View on Bt Proteins - How Specific are They and What Else Might They Do? (2006, background): “Raps et al. (2001) and Head et al. (2001) did not detect any Bt toxin in the phloem of Bt maize or in aphids feeding on it. By contrast, spider mites did ingest the Bt toxin from the Bt maize but this did not induce higher mortality in the lacewing larvae.”
• Transgenic crops expressing Bacillus thuringiensis toxins and biological control (2006, background): “To date, only trace amounts of the Cry proteins have been detected in sap-feeders on different Bt -transgenic events of maiz”
• Assessing the risks of insect resistant transgenic plants on entomophagous arthropods Bt-maize expressing Cry1Ab as a case study (2003, background): “Aphids do not ingest the toxin when either reared on Bt11, Event176 (Raps et al., 2001; Dutton et al., 2002) or Mon810 ( Head et al., 2001 ).”
• Transgenic Bt maize and Rhopalosiphum padi (Hom., Aphididae) performance (2004, background): “padi are not susceptible to the Cry1Ab toxin (Dogan et al., 1996; Lozzia et al., 1998; Head et al., 2001; Raps et al., 2001; Dutton et al., 2002).”