Bienvenido al ::: SerTox :::!

     Menú
· Noticias
· Institucional
· Investigación
· Materiales Educativos
· Biblioteca multimedia
· Preguntas frecuentes
· Boletín
· Buscar
· Contáctenos
· Enlaces - Directorio
· Glosario
· Noticias x Mes
· Temas
· Top 15

EnglishSpanish

     Buscar


     Categorías
· Todas las Categorías
· Aportes
· Ejercicios
· Informan / Escriben
· La prensa
· Noticias del Sertox
· Recomendamos
· Toxicología al día
· Trivia toxicológica
· zNo sólo de tóxicos

     Blogs



     Manifiesto amianto





 Toxicología al día: A research to understand how superweeds obtain resistance to the popular herbicide glyphosate

Ver Imagen

Blanco o negro (Foto: Sertox )

Glyphosate-resistant 'superweeds' may be less susceptible to diseases. esciencenews.com.  July 17, 2012. Scientists searching for clues to understand how superweeds obtain resistance to the popular herbicide glyphosate may have been missing a critical piece of information, a Purdue University study shows. Glyphosate, the active ingredient in the weed killer sold under the name RoundUp, is the most widely used herbicide in the United States, but some plants have grown resistant to it. 

This has caused farmers to turn to additional herbicides. While the mechanisms that have led to resistance are not fully known, Bill Johnson, a professor of weed science; Steve Hallett, an associate professor of weed science; and Jessica Schafer, a graduate student in botany and plant pathology, believe that soil microbes may play a role.

Most laboratory tests done to understand glyphosate resistance are done in sterile soil, void of those microbes. Schafer said Purdue's findings, published online early in the journal Weed Science, show that those microbes may play a significant role in how glyphosate affects plants.

"The soil you're growing the plants in is important to the results," Schafer said. "If we're growing in a sterile media, we could get some false positive results because the plants are more tolerant to glyphosate in those conditions."

Hallett and Schafer grew giant ragweed, horseweed and common lambsquarter in both sterile soil and field soil and subjected them to glyphosate. In each soil, strains of weeds both susceptible and resistant to glyphosate were tested.

Both versions of giant ragweed were damaged more from the glyphosate in field soil. The susceptible version of common lambsquarter was also more heavily damaged in field soil. Horseweed fared the same no matter which soil or strain -- susceptible or resistant.

The results show that microbes can play an important role in the activity of glyphosate, presumably by invading the glyphosate-weakened plants. The results also suggest that glyphosate-resistant weeds may be more resistant to disease pressure as well.

"Soil microbes can be minor to major contributors to how glyphosate is able to affect plants," Hallett said. "We may be selecting not only for glyphosate resistance, but inadvertently selecting for weeds that have disease resistance as well."

A weed's ability to withstand glyphosate was based on dry shoot and root weight after testing. The sterile soil used in the study came from field soil exposed to gamma radiation to kill microbes and bacteria. The irradiated soil was tested to ensure that its nutrients were not diminished.

Hallett, Johnson and Schafer said further studies would look at how fungi in the soil affect root development, both with and without glyphosate.

"Dirt is a living organism," Johnson said. "It's important to know how all the pieces interact."

The research was conducted with internal funding from Purdue's Department of Botany and Plant Pathology.

Source: Purdue University

Enviado por jcp el 31 julio 2012 00:00:00 (797 Lecturas)






Artículos e imágenes de:
 Plaguicidas / Pesticidas
Plaguicidas / Pesticidas
 País: Estados Unidos y Canadá
País: Estados Unidos y Canadá
 Plaguicidas: Glifosato
Plaguicidas: Glifosato

 
     Enlaces Relacionados


Noticia más leída sobre Plaguicidas / Pesticidas:
Se intoxicaron por no esperar lo suficiente después de la fumigación contra el dengue de sus casas


     Votos del Artículo
Puntuación Promedio: 0
votos: 0

Por favor tómate un segundo y vota por este artículo:

Excelente
Muy Bueno
Bueno
Regular
Malo


     Publicidad






Todos los logos y marcas registradas son propiedad de sus respectivos dueños. Los comentarios son propiedad de quienes lo envían, todo el resto © 2006-2011 by Sertox.

Webs Asociadas: www.country2.com / Radio FM Estacion San Pedro / Lombó Teatro Salamanca - Zamora

PHP-Nuke Copyright © 2005 by Francisco Burzi. This is free software, and you may redistribute it under the GPL. PHP-Nuke comes with absolutely no warranty, for details, see the license.
Página Generada en: 0.04 Segundos