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Re: [SANET-MG] SANET-MG Digest - 19 Jun 2006 to 22 Jun 2006 (#2006-193)



Hello Steve,
In a general way metabolic herbicidal residue is a Teutonic way of saying breakdown products. In the case of glyphosate the product aminomethylphosphonic acid(AMPA) is a residue of concern, in soybean half the glyphosate taken up by rr crops is converted to that compound. Its toxicity is little studied as yet and those residues are not taken into account by food safety regulators. Turning , for example, to 2,4-D the herbicide is rapidly converted in soil to compounds that are , if anything, more toxic than the herbicide. That is my understanding of the words you queried, however, I am not absolutely fluent in Teutonic :-) .
sincerely,joe
Steve Gilman wrote:
Hi Joe,

Increasing glyphosate resistance is a known factor in this country. Would you elaborate on what the formation of a "metabolic herbicidal residue" is?

much thanks,

Steve Gilman
Ruckytucks Farm

On Jun 23, 2006, at 12:00 AM, SANET-MG automatic digest system wrote:

From:    jcummins <jcummins@UWO.CA <mailto:jcummins@UWO.CA>>

Subject: epidemic of glyphosare resistance caused by increased glyphosate use


doi:10.1016/j.tplants.2006.05.004
Trends in Plant Science

Plant biotechnology: ecological case studies on herbicide resistance


Heinrich Sandermanna, b,

aecotox.freiburg, Schubertstr. 1, D-79104 Freiburg, Germany

bGSF-National Research Centre, Institute of Biochemical Plant Pathology,
Ingolstädter Landstr. 1, D-85764 Neuherberg, Germany


Available online 16 June 2006.

The emerging field of molecular ecology aims to improve the ecological predictability of transgenic crop plants. The most widely cultivated lines are Roundup-Ready® plants, which are genetically modified to be resistant to the broad-spectrum herbicide glyphosate. Recent publications demonstrate two ecological effects that were not anticipated: the widespread emergence of glyphosate-resistant weed biotypes and the formation of a metabolic herbicidal residue. Both effects appear to be due to the increased use of glyphosate rather than the genetic modification in the transgenic crop plant. With one prominent exception, opinions collected from the literature point towards a certain degree of resistance mismanagement and an inadequate
testing of the ecological effects of extensive glyphosate use.




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