Breeding for CLEARFIELD Herbicide Tolerance: Registration of ‘ND901CL’ Spring Wheat

'ND901CL' (Reg. No. CV-1029, PI 655233) hard red spring wheat (HRSW) (Triticum aestivum L.) was developed at North Dakota State University (NDSU) and released by the North Dakota Agricultural Experiment Station (NDAES). ND901CL was released in 2008 primarily for its tolerance to imadazolinone herbicides. It has superior adaptation to rainfed wheat production in western regions of North Dakota and counties in adjacent states. It is a CLEARFIELD-tolerant wheat intended to be used with Beyond herbicide (active ingredient imazamox, 2-[4,5-dihydro-4-methyl-4-(1-methylethyl)-5-oxo-1H-imidazol-2-yl]-5-(methoxymethyl)-3-pyridinecarboxylic acid; BASF Corporation, Research Triangle Park, NC). The tolerance to CLEARFIELD herbicide in ND901CL is controlled by two genes. The als1 locus for acetolactate synthase, is located on the D genome and was transferred from 'FS4' wheat. The als2 locus is located on the B genome and originated from 'Teal 11A' wheat. ND901CL was derived from the Teal 11A/3/'Grandin' (PI 531005)/FS4//*3'Kulm' cross made at NDSU in 2002. Grandin and Kulm are two HRSW cultivars released by NDAES in 1989 and 1994, respectively. Both FS4 and Teal 11A were provided by the BASF Corporation to our breeding program. ND901CL was produced from a bulk of one purified F(4:5) plot selected in 2004 at Christchurch, New Zealand. ND901CL was released because it combines high yield with good end-use quality and tolerance to BEYOND herbicide.