Submitted to: Crop Science
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 4/27/2004
Publication Date: 9/1/2004
Citation: Marshall, D.S., Sutton, R.L., Rudd, J.A. 2004. Registration of tam 303 wheat. Crop Science. Interpretive Summary: TAM 303 is a new, hard red winter wheat variety that has resistance to several important diseases, including leaf rust, powdery mildew, septoria leaf blotch, and soil-borne mosaic virus. TAM 303 produces high grain yields in its primary production zones, which include the southern Great Plains of the U.S.
Technical Abstract: TAM 303 is a hard red winter wheat (Triticum aestivum) experimental line developed by the Texas Agricultural Experiment Station (TAES) and the USDA/ARS. It is an F4 derived line from the cross TX89D1253*2/TTCC404 (=WX93D208-9-1-2). TX89D1253 is a line from the Dallas wheat breeding program. TTCC404 is an Aegilops tauschii line (one of the progenitor species of wheat) that was collected by David Marshall and Lloyd Nelson during a germplasm collection trip to Turkey in 1991. David Marshall, TAES Dallas, made the cross during the winter of 1991-92. The F2, F3, and F4 generations were grown as bulk populations on the TAES farm at Prosper in 1994 (year of harvest) through 1996. Random heads were harvested from the F4 population and were planted as head-rows at Prosper in the fall of 1996. The line that became TAM 303 was visually selected for its foliar disease resistance and was grown as a single plot in 1998 and in replicated trials thereafter. It was tested in Texas Elite trials (NTE, WTE, TXE) 2001-2003, Southern Regional Performance Nursery (SRPN) 2001-2002, and the Texas Uniform Variety Trial (UVT) in 2004. The selection criteria were foliar disease resistance, adaptation to the Texas Blacklands, grain yield, and bread-making quality. A head-row purification was planted in the fall of 2004 with the objective of producing 500 pounds of pure seed. TAM 303 is an awned, semi-dwarf, hard red winter wheat with red chaff. It is medium height and medium maturing, compared to commonly grown hard winter wheat cultivars. It has been extensively tested throughout Texas, the Great Plains, and the eastern U.S. and has proved to be high yielding across a wide range of environments. It is particularly suited for the Texas Blacklands because of foliar disease resistance. It is highly resistant to leaf rust and powdery mildew and moderatly resistant to stripe rust. It shows moderate resistance to wheat soilborne mosaic virus and wheat streak mosaic virus. Test weight is medium and milling and baking characteristics are considered adequate. It does have the 1AL.1RS translocation where the short arm of chromosome 1 in rye has been substituted for the long arm of chromosome 1A in wheat. Authorized seed classes of TAM 303 in the U.S. will be Breeder, Foundation, Registered, and Certified. An application for Plant Variety Protection will be made.