Il mais resistente a diabrotica non danneggia i nematodi

27 Apr 2011
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Una nuova prova che il mais Bt Mon88017 non danneggia (molto) gli organismi non-target come i nematodi. Resta la domanda di fondo se questo sapccare il capello in 400 e’ uno spreco di fondi che serve solo a dire che servono maggiori ricerche ed approfondimenti.

http://www.ncbi.nlm.nih.gov/pubmed/21511326

Sci Total Environ. 2011 Apr 19.

Assessing the risk posed to free-living soil nematodes by a genetically modified maize expressing the insecticidal Cry3Bb1 protein.
Höss S, Nguyen HT, Menzel R, Pagel-Wieder S, Miethling-Graf R, Tebbe CC, Jehle JA, Traunspurger W.
Source

Institute of Biodiversity-Network (ibn), Drei-Kronen-Gasse 2, 93047 Regensburg, Germany; Ecossa (Ecological Sediment and Soil Assessment), Giselastr. 6, 82319 Starnberg, Germany.
Abstract

Before pest-resistant genetically modified maize can be grown commercially, the risks for soil-beneficial, non-target organisms must be determined. Here, a tiered approach was used to assess the risk to free-living soil nematodes posed by maize genetically modified to express the insecticidal Cry3Bb1 protein (event Mon88017), which confers resistance towards western corn rootworm (Diabrotica virgifera; Coleoptera). The toxicity of purified Cry3Bb1 for the nematode Caenorhabditis elegans was determined using a bioassay and gene expression analysis. In addition, a soil toxicity test was used to assess the effects on C. elegans of rhizosphere soil obtained from plots of an experimental field grown with Mon88017, the near-isogenic cultivar, or either of two conventional cultivars. Finally, the indigenous nematode communities from the experimental field site with Mon88017 and from the control cultivars were analyzed. The results showed a dose-dependent inhibitory effect of Cry3Bb1 on the growth and reproduction of C. elegans, with EC50 values of 22.3mgl(-1) and 7.9mgl(-1), respectively. Moreover, Cry-protein-specific defense genes were found to be up-regulated in the presence of either Cry1Ab or Cry3Bb1. However, C. elegans was not affected by rhizosphere soils from Mon88017 compared to the control plots, due to the very low Cry3Bb1 concentrations, as indicated by quantitative analyses (<1ngg(-1) soil). Nematode abundance and diversity were essentially the same between the various maize cultivars. At the last sampling date, nematode genus composition in Bt-maize plots differed significantly from that in two of the three non-Bt cultivars, including the near-isogenic maize, but the shift in genus composition did not influence the composition of functional guilds within the nematode communities.

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