Molecular genetics of herbicide resistance in Palmer amaranth (Amaranthus palmeri) : metabolic tembotrione resistance and geographic origin of glyphosate resistance
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Palmer amaranth (Amaranthus palmeri) is a major weed in U.S. cotton and soybean production systems, partly because it evolved resistance to five different herbicide modes of action. Resistance to the 4-hydroxyphenylpyruvate dioxygenase (HPPD)-inhibitor tembotrione in a population from Nebraska (NER) is due to enhanced metabolism. This type of non-target-site resistance is especially troublesome because of its potential for cross-resistance. Tembotrione-susceptible (NES) and NER formed the same tembotrione metabolites but NER exhibited faster 4-hydroxylation followed by glycosylation. The T 50 ...
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