SMOOTH PIGWEED (Amaranthus hybridus (syn: quitensis)) with GROUP B/2 resistance: (INHIBITION OF ACETOLACTATE SYNTHASE ) Inhibition of Acetolactate Synthase
MUTATION: TRYPTOPHAN 574 to LEUCINE
Smooth Pigweed (Amaranthus hybridus (syn: quitensis)) is a dicot plant in the amaranthaceae family. A single amino acid substitution from Tryptophan 574 to Leucine has led to resistance to Inhibition of Acetolactate Synthase as indicated in the table below.		Smooth Pigweed

Chemical Family	Example Herbicide	Resistance Level
Imidazolinones	Imazethapyr	Resistant > 10 fold
Pyrimidinyl benzoates	Bispyribac-Na	Not Determined
Sulfonylureas	Chlorsulfuron	Resistant > 10 fold
Triazolopyrimidine - Type 1	Chloransulam-methyl	Resistant > 10 fold
Triazolinones	Flucarbazone-Na	Not Determined

REFERENCES

Schmenk, R. E., M. Barrett, And W. Witt E.. 1997. An investigation of smooth pigweed (Amaranthus hybridus L.) resistance to acetolactate synthase inhibiting herbicides. Weed Science Society of America Abstracts 37 : 117.

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This case was entered by Patrick Tranel Email: tranel@illinois.edu

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