A wheat or triticale plant comprising an isolated, recombinant, mutagenized, or synthetic Imi nucleic acid, wherein the nucleic acid encodes an amino acid sequence identical to the amino acid sequence of the Imil polypeptide expressed by a plant of line Brookton-8, a representative sample of seed of the line having been deposited with American Type Culture Collection (ATCC) under Patent Deposit Designation Number PTA-4256, wherein the Imi1 polypeptide confers upon the wheat or triticale plant increased tolerance to an imidazolinone herbicide when compared to a wild-type wheat or triticale plant.
