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Title: REGISTRATION OF 'OK102' WHEAT

Author
item CARVER, BRETT
item KRENZER, EUGENE
item HUNGER, ROBERT
item Porter, David
item SMITH, EDWARD
item KLATT, A
item VERCHOT-LUBICZ, J
item RAYAS-DUARTE, P
item GUENZI, A
item BAI, G
item MARTIN, B

Submitted to: Crop Science
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 12/1/2003
Publication Date: 7/1/2004
Citation: Carver, B.F., Krenzer, E.G., Hunger, R.M., Porter, D.R., Smith, E.L., Klatt, A.R., Verchot-Lubicz, J., Rayas-Duarte, P., Guenzi, A.C., Bai, G., Martin, B.C. 2004. Registration of 'Ok102' wheat. Crop Science. 44:1468-1469.

Interpretive Summary:

Technical Abstract: 'Ok102' is a hard red winter (HRW) wheat (Triticum aestivum L.) developed cooperatively by the Oklahoma Agricultural Experiment Station and the USDA-ARS. Ok102 was released in March 2002, primarily based on its resistance to several foliar diseases, excellent milling quality, and desirable dough strength for leavened bread products. Ok102 was derived from the cross, HBZ374C/'Cimarron', performed in 1991. HBZ374C has the pedigree, IL71-5662/'PL145'//'2165' and was released by the Oklahoma Agric. Exp. Stn. in 1997 as '2174'. Cimarron has the pedigree, 'Payne'*2/CO725052, and was released by the Oklahoma Agric. Exp. Stn. in 1990. Ok102 traces to the bulk progeny of a single F3:4 head row harvested in 1995. The head row progeny was selected in 1996 from a non-replicated nursery at Lahoma, OK for its acceptable winterhardiness, plant and head type, heading and maturity date, leaf rust resistance, lodging resistance, grain yield, volume weight, kernel plumpness, and mixograph properties. Subsequent generations were advanced by bulk selfing in the field, with roguing of taller variants each year until 2002. Ok102 was evaluated as OK97508 in replicated Oklahoma performance trials from 1997 to 2001, and in the Southern Regional Performance Nursery (SRPN) in 2000 and 2001. Ok102 is semidwarfed but shorter than most HRW cultivars currently in production. Its mature-plant height (77cm) is 8 cm shorter than 2174 and 'Ok101' and 7 cm shorter than Jagger. Lodging resistance on a scale of 1 (highly resistant) to 5 (susceptible) is about 2 for Ok102, compared with values of 1 for 2174, 3 for Ok101, and 4 for Jagger. Ok102 shows an intermediate reaction to acidic, aluminum-toxic soil. With a tolerance rating of 3.2 on a scale of 1 (most tolerant) to 5 (most susceptible), Ok102 is more sensitive to Al toxicity than Ok101 (1.3) and Jagger (1.6), but similar to 2174 (3.0). Ok102 breaks winter dormancy relatively late, but its heading date (123 d) is intermediate to current cultivars. Comparative placement of cultivars for arrival at first-hollow-stem stage is Ok102=2174>Ok101>Jagger. Precise differences are highly year-dependent.