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Lancaster, OH | Mutation is likely not the issue. A shift in the populations to ones that have more resistance and then those crossing is the issue. It would be important to distinguish that point. That said, the result is the same--a population that survives where previous ones did not.
In my experience, this has come from using less that lethal rates/weed size in selecting those with more tolerance. In most cases, the plants are fully resistant but tolerant to the rates we would use.
In RR crops, an additional gene(S) have been added that provide an alternate pathway for plant metabolism to continue when the glyphosate blocks the primary and most common one. This allows the plant to continue to grow and thrive in the presence of glyphosate. Some work has indicated that these plants that have become more tolerant may have another method. It may be somewhat like some other technologies that are being developled to compete with the RR trait that does more of a de-toxification than providing an alternate pathway.
I'm with Marv. There is much more info out there in scientific literature that is more valid that what you might read from us. Good luck with your research.
Edited by JimmyP 10/23/2009 08:51
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glyphosate resistant weeds.
