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8 Cards in this Set
- Front
- Back
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were sulfonylureas and imidazolinones discovered together?
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no, independently (1980s)
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what is mech of action of sulfonylureas and imidazolinones?
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act as same mech at extreme low doses
cause reversal of growt inhbitions in bacteria and plantsby adding branch chained amino acids reduce synthesis of isoleucine, leucine, valine |
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what is use and toxicology of sulfonylureas and imidazolinones
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most potent herbicide (analogous to deltamethrin in insecticide)
better for broad leaf than grass weeds persitance in soil problem low tox to fish and mammals |
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how is slectivity of sulfonylureas conferred?
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rapid metabolism in tolerant species involving hydroxylation of phenyl substituent or GSH conjugation
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what is synthetic pathway of branched chain amino acdis in plants?
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p. 216
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what is key enzyme in branched chain amino acid synthesis in plants?
what is necessary cofactor? |
AHAS convert pyruvate to acetolactate
TPP, thiamine pyrophosphate |
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what inhibit enzyme AHAS?
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valine, sulfonylureas and imidazolinones
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how can genetic engineering confer crop resistance to sulfonylureas and imidazolinones
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plants seleted for herbicide resistance produce ALS thats insensitive to ihibition, insert AHAS (aka ALS) to make crop tolerance, express insensitive target enzyme expressed in crops,
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