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I found a paper investigating the mechanism of glyphosate resistance in Conyza canadensis. They used 31P NMR to investigate the fate of the glyphosate in vivo. What they found is that the resistant plants are able to transport glyphosate into the vacuole: The following view of horseweed resistance to glyphosate emerges from the data presented herein. ...


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According to this link from Purdue, the seed of the answer is this: The herbicide is used to kill broadleaf weeds, which are dicots, while monocot grasses, such as sorghum and corn, are more resistant. That's because grasses inactivate 2,4-D inside the plant, while broadleaf dicots do not. But on the other hand, Song 2014 has this to say about 2,4-D: ...


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The difference may be related to how the plants fix carbon. While all plants convert CO2 and H2O to glucose and oxygen, there are at least three pathways that are used to do it. The C3 pathway is older and less efficient than the CAM and C4 pathways. Many drought tolerant plants use the CAM or C4 pathways because less water is needed. The C4 pathway is ...



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