Patent ID: 7345221

Claim:
A herbicide-resistant hybrid rice plant produced by the process of: (a) crossing or back-crossing the rice plant having ATCC accession number PTA-904 with other rice germplasm; (b) growing rice plants resulting from said crossing or back-crossing in the presence of at least one herbicidally-effective imidazolinone at levels of the imidazolinone herbicide that would normally inhibit the growth of a rice plant; and (c) selecting for further propagation hybrid rice plants resulting from said crossing or back-crossing, wherein the hybrid rice plants selected are plants that grow without significant injury in the presence of the imidazolinone herbicide; wherein: (d) said herbicide-resistant hybrid rice plant expresses a mutant acetohydroxyacid synthase whose enzymatic activity is directly resistant to normally-inhibitory levels of a herbicidally-effective imidazolinone; (e) said herbicide-resistant hybrid rice plant is resistant to each of the following imidazolinone herbicides, at levels of the imidazolinone herbicides that would normally inhibit the growth of a rice plant: imazethapyr, imazapic, imazaquin, imazamox, and imazapyr; (f) said herbicide-resistant hybrid rice plant is resistant to each of the following sulfonylurea herbicides, at levels of the sulfonylurea herbicides that would normally inhibit the growth of a rice plant: nicosulfuron, metsulfuron methyl, thifensulfuron methyl, and tribenuron methyl; and (g) said herbicide-resistant hybrid rice plant is sensitive to each of the following sulfonylurea herbicides, at levels of the sulfonylurea herbicides that would normally inhibit the growth of a rice plant: sulfometuron methyl, chlorimuron ethyl, and rimsulfuron.