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General Information

Document type
  • Peer-reviewed journal article
GE organism
  • maize
GE trait
  • insect resistance
Events
  • Bt 11
  • Bt 176
Country
  • Italy

Results

Safety for environment
  • mixed

Impact of Bt corn on rhizospheric and soil eubacterial communities and on beneficial mycorrhizal symbiosis in experimental microcosms Open Access

Castaldini, M; Turrini, A; Sbrana, C; Benedetti, A; Marchionni, M; Mocali, S; Fabiani, A; Landi, S; Santomassimo, F; Pietrangeli, B; Nuti, MP; Miclaus, N; Giovannetti, M
Applied and Environmental Microbiology. 2005 November. 71(11):6719-6729

Link to full text (open access, freely available)

PMID: 16269702 DOI: 10.1128/AEM.71.11.6719-6729.2005 ISSN: 0099-2240

Abstract

A polyphasic approach has been developed to gain knowledge of suitable key indicators for the evaluation of environmental impact of genetically modified Bt 11 and Bt 176 corn lines on soil ecosystems. We assessed the effects of Bt corn (which constitutively expresses the insecticidal toxin from Bacillus thuringiensis, encoded by the truncated Cry1Ab gene) and non-Bt corn plants and their residues on rhizospheric and bulk soil eubacterial communities by means of denaturing gradient gel electrophoresis analyses of 16S rRNA genes, on the nontarget mycorrhizal symbiont Glomus mosseae, and on soil respiration. Microcosm experiments showed differences in rhizospheric eubacterial communities associated with the three corn lines and a significantly lower level of mycorrhizal colonization in Bt 176 corn roots. In greenhouse experiments, differences between Bt and non-Bt corn plants were detected in rhizospheric eubacterial communities (both total and active), in culturable rhizospheric heterotrophic bacteria, and in mycorrhizal colonization. Plant residues of transgenic plants, plowed under at harvest and kept mixed with soil for up to 4 months, affected soil respiration, bacterial communities, and mycorrhizal establishment by indigenous endophytes. The multimodal approach utilized in our work may be applied in long-term field studies aimed at monitoring the real hazard of genetically modified crops and their residues on nontarget soil microbial communities.

Keywords

soil; microbes; mycology; respiration

Funding

Funding source
  • Italian National Institute for Occupational Safety and Prevention (ISPESL)
  • Ministry of Health
Funding country
  • Italy
Funding type
  • government

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Cite this study

MLA

Castaldini, M, A Turrini, C Sbrana, A Benedetti, M Marchionni, S Mocali, A Fabiani, S Landi, F Santomassimo, B Pietrangeli, MP Nuti, N Miclaus, M Giovannetti. "Impact of Bt corn on rhizospheric and soil eubacterial communities and on beneficial mycorrhizal symbiosis in experimental microcosms." Applied and Environmental Microbiology 71.11 (2005): 6719-6729 . Web. 18 Jul. 2018.

APA

Castaldini, M., Turrini, A., Sbrana, C., Benedetti, A., Marchionni, M., Mocali, S., Fabiani, A., Landi, S., Santomassimo, F., Pietrangeli, B., Nuti, MP., Miclaus, N., & Giovannetti, M. (2005). Impact of Bt corn on rhizospheric and soil eubacterial communities and on beneficial mycorrhizal symbiosis in experimental microcosms. Applied and Environmental Microbiology, 71(11), 6719-6729 . doi:10.1128/AEM.71.11.6719-6729.2005

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