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June, 2007
Source:
CropBiotech Update
Transgenic tomato plants
expressing modified Bacillus thuringiensis (Bt) cry6A genes were
found to have increased resistance to the root-knot nematode
Meloidogyne incognita. This is the first time that a Bt Cry
protein was demonstrated to confer plant resistance to an
endoparasitic nematode, and that Cry proteins are reported to
have the potential to control plant-parasitic nematodes in
transgenic plants.
Researchers at the University of
California tested two cry6A genes – one was modified not to
have codons (sets of three DNA bases that code for an amino
acid) uncommon in plants, and the other altered to include only
optimal codons for each amino acid based on studies in
Arabidopsis. The researchers report that there was a fourfold
decrease in progeny production of the nematode pest brought
about by cry6A expression in the plants. They recommend that
cry6A be ‘stacked’ in crop varieties with other
nematode-resistant traits.
The paper, published by the
Plant
Biotechnology Journal, can be accessed at
http://www.blackwell-synergy.com/doi/abs/10.1111/j.1467-7652.2007.00257.x.
Tomates
Bt podrían ser resistentes a nematodes
Científicos de la Universidad de California
obtuvieron tomates transgénicos con genes cry6A de
Bacillus thuringiensis (Bt). Estos tomates
resultaron más resistentes al nematode Meloidogyne
incognita, que ataca la raíz de la planta. Esta es
la primera vez que se demuestra que un gen cry de B.
thuringiensis le confiere resistencia a nematodes a
una planta, ya que hasta ahora sólo se empleaban
para el control de insectos. Los investigadores
probaron dos variantes del gen cry6A y lograron que
las plantas transgénicas una disminución de cuatro
veces en la producción de progenie de los nematodes.
El trabajo fue publicado en la revista Plant
Biotechnology Journal.
Source:
ArgenBio |
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