The invention provides transgenic or non-transgenic plants with improved levels of tolerance to AHAS-inhibiting herbicides. The invention also provides nucleic acids encoding mutants of the acetohydroxyacid synthase (AHAS) large subunit, expression vectors, plants comprising the nucleic acids encoding the AHASL subunits containing one, two, or more mutations, plants comprising such AHASL subunit mutant nucleic acids, methods for making and using the same, and methods of controlling weeds.
