Registration of Imidazolinone Herbicide-Resistant Maintainer (HA 442) and Fertility Restorer (RHA 443) Oilseed Sunflower Germplasms.

The article reports on the registration of HA 442, imidazolinone herbicide-resistant maintainer and RHA 443, fertility restorer of the oilseed sunflower germplasms developed by United States Department of Agriculture-ARD, Fargo and the North Dakota Agricultural Experiment Station in North Dakota. These germplasms were developed as the resistant to the imidazoline herbicide imazamox intended to be used by the sunflower industry and the public researchers. The HA 442 is derived from F6 to F7 maintainer lines which are selected from the cross HA 425/87CAEB//HA434/HA 412 with a high oleic fatty acid concentration. While RHA 443 was derived from F6 to F7 restorer line which is selected for the cross RHA 426/RHA 419//RHA 377/AS 4379.