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Asunto:Re: [LEA-Venezuela] Foro sobre Transgénicos con Miguel Altieri
Fecha:Martes, 4 de Diciembre, 2001  23:03:43
Autor:L.Ciro Marcano <lcmarcano @.......com>

Probablemente este articulo de Kate Wong contribuya al foro,

Atentamente
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
L. Ciro Marcano
Graduate School of Geography
Clark University
950 Main Street
Worcester, MA 01610 (USA)


ECOLOGY

Full article at:
http://www.scientificamerican.com/news/112901/1.html


GM Corn Contaminates Distant Native Plants

In news that will surely fan the flames of the heated debate over 
genetically
modified
               crops, scientists have found evidence that genes from GM 
plants
can spread far and
               wide to native ones. According to a report published today in
the journal Nature, wild
               corn from the remote mountains of Oaxaca, Mexico contains
transgenic DNA. This, the
               researchers note, bolsters concerns that such unintentional
contamination can threaten
               the genetic diversity of natural crops.

               DNA analyses of the Oaxaca corn revealed several signs of 
gene
transfer from
               transgenic plants, including a gene of Bacillus thuringiensis
(Bt), a bacterium that
               produces a toxin lethal to common pests. The results came as 
a
surprise to study
               co-author Ignacio Chapela of the University of California. "I
repeated the tests at least
               three times to make sure I wasn’t getting false-positives," 
he
remarks. "It was initially
               hard to believe that corn in such a remote region would have
tested positive."

               Indeed, exactly how the contamination occurred remains a
mystery. Previously, some researchers have asserted that corn
               pollen is too heavy to be carried long distances by the wind.
And Mexico has had a moratorium on the planting of GM corn since
               1998. The closest a GM corn crop has ever come to the Oaxaca
plants, as far as anyone knows, is 60 miles away. "It’s not clear
               if the moratorium was poorly enforced, or the contamination
occurred before the moratorium was enacted," Chapela comments.
               "Whatever the source, it’s clear that genes are somehow 
moving
from bioengineered corn to native corn."

               The contamination is particularly troubling, Chapela says,
because areas of crop origin and diversification like Oaxaca house
               "bank accounts" of genetic diversity—the best insurance 
against
disease, pests and changing climates. And with regard to
               global food security he notes, "we can’t afford to lose that
resource." —Kate Wong






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Subject: [LEA-Venezuela] Foro sobre Transgénicos con Miguel Altieri
Date: Mon, 3 Dec 2001 21:58:32 -0400



RED AGROECOLÓGICA VENEZOLANA
REAVE


En el marco del Curso "Agroecologúia y Desarrollo Sostenible"  Dictado por 
los doctores: Miguel Angel Altieri y Clara Nicholls de la Universidad de 
California. Auspiciado y organizado por la Universidad Simón Rodríguez, se 
celebrará el día 6/12/01 la Conferencia "Implicaciones Ecológicas y Sociales 
del Cultivo de los Trangénicos: Una Visión desde la Agroecoógía"

Lugar: Ateneo de Caracas (sala A)
Hora: 4 pm.


* * * * * * * * * * * * * * * * * * * * * * **
      * La gestion ambiental del Presidente CHAVEZ *
      * merece una amplia discusión, ¡PARTICIPA!   *
      * * * * * * * * * * * * * * * ** * * * * * * *

¡Visita el sitio de archivos de LEA! disponible en
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Contacta a lea-admin@...
Para retirarte de LEA envía un mensaje a: lea-baja@...


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