Submitted to: Crop Science
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 3/2/2003
Publication Date: 8/1/2003
Citation: Marshall, D.S., Sutton, R., Lazar, M.D., Nelson, L.R., Mcdaniel, M.E. 2003. Registration of tambar 501 barley. Crop Science. Interpretive Summary: A new winter barley variety, TAMBAR 501 was bred, developed and released by the Texas Agricultural Experiment Station, and for producers in the Great Plains of the United States. The variety has higher yields and better disease resistance than currently-grown varieties.
Technical Abstract: TAMBAR 501 was derived from a composite cross population (CC11) made in the spring of 1986. The maternal parent in CC11 was 'Post' (CI 15695) and the pollen parent consisted of an equal mixture (by seed weight) of 'Hitchcock' (PI 485594), 'Kanby' (PI 539139), 'Milton' (CI 15732), 'Paoli' (CI 15235), 'Schuyler' (CI 11887), 'TAMBAR 401' (CI 13778), and 'TAMBAR 402' (PI 468115). TAMBAR 501 was tested in replicated, 3-location preliminary and advanced trials in 1994-95 and 1995-96, respectively; in the Uniform Barley Elite Trial (UBET) for four years (1997 through 2000); and USDA/ARS Uniform Winter Barley Nursery. TAMBAR 501 has semi-prostrate early growth. There are typically 6 nodes on each adult stem, with terminal stem extension of approximately 0-to-3 cm. The collar shape is closed and neck shape is straight. The flag leaf position is upright at boot stage. Head shape is oblong with no kernel overlap. Lemma awns are long and rough. Seed of TAMBAR 501 is midlong to long; hulls are slightly wrinkled and the aleurone is colorless. Over four years and 22 locations in the UBET, the grain yield of TAMBAR 501 was 4687 kg ha-1, compared to 4181 kg ha-1 for Post 90, 4154 kg ha-1 for 'Starling' and 4101 kg ha-1 for TAMBAR 500. Similarly, the test weight in the UBET for TAMBAR 501, Post 90, Starling, and TAMBAR 500 were 622 kg m-3, 609 kg m-3, 593 kg m-3, and 614 kg m-3, respectively. Over 24 location years in the UWBYT, TAMBAR 501 had a grain yield of 4870 kg ha-1 and a test weight of 571 kg m-3, whereas the common check for both years (1998 and 1999), 'Wysor' had a grain yield of 4456 kg ha-1 and a test weight of 570 kg m-3. TAMBAR 501 has expressed good tolerance to barley yellow dwarf virus (BYDV) as measured in the field using a 0-to-9 scale (where 0 = no symptoms and 9 = plant death from BYDV). The rating for TAMBAR 501 has averaged 2.2, whereas Starling, Post 90, and TAMBAR 500 averaged 2.7, 3.1, and 3.3, respectively. The field reaction of TAMBAR 501 to leaf rust (caused by Puccinia hordei Otth.) has been resistant when tested in the southern Great Plains, compared to a moderately susceptible reaction for TAMBAR 500, and susceptible reaction for Post 90 and Starling. Compared to Wysor over all the testing sites in the UWBYN, TAMBAR 501 was rated as resistant to leaf rust, whereas Wysor was susceptible. Similar to Wysor, TAMBAR 501 is moderately resistant to net blotch (caused by Pyrenophora teres Drechs.), spot blotch [caused by Drechslera teres (Sacc.) Shoemaker] and scald [caused by Rhynchosporium secalis (Oudem.) J. J. Davis]. For powdery mildew [Blumeria graminis (DC.) E. O. Spear], TAMBAR 501 is susceptible, compared to the resistant Wysor.