Ok101
Oklahoma's First Red Wheat Variety
 for the 21^st Century

Production Technology - Crops

April 2001

Gene Krenzer, Brett Carver, Bob Hunger, 
Art Klatt, David Porter, and Lewis Edwards
Department of Plant and Soil Sciences
Division of Agricultural Sciences and Natural Resources
Oklahoma State University

Issued in furtherance of Cooperative Extension work, acts of May 8 and June 30, 1914, in cooperation with the U.S. Department of Agriculture, Sam E. Curl, Director of Oklahoma Cooperative Extension Service, Oklahoma State University, Stillwater, Oklahoma. This publication is printed and issued by Oklahoma State University as authorized by the Dean of the Division of Agricultural Sciences and Natural Resources.

Issued in furtherance of Cooperative Extension work, acts of May 8 and June 30, 1914, in cooperation with the U.S. Department of Agriculture, Sam E. Curl, Director of Oklahoma Cooperative Extension Service, Oklahoma State University, Stillwater, Oklahoma. This publication is printed and issued by Oklahoma State University as authorized by the Dean of the Division of Agricultural Sciences and Natural Resources.

Ok101 is a hard red winter wheat variety released in 2001 by the Oklahoma Agricultural Experiment Station and the USDA-ARS. It is targeted for dryland and irrigated production systems in areas west of a line from Lawton to Blackwell, OK. It is well adapted to an early-planted graze-plus-grain management system with good fall forage production (Table 2), low post-harvest seed dormancy, and an intermediate dormancy release during late winter.

Experimentally tested as OK95571, grain yield performance of Ok101 has been similar to 2174, Custer, 2137, and Jagger (Table 1). Ok101 has as much tolerance to low pH as any variety currently grown in Oklahoma. Ok101 is medium-early in maturity and is a medium height semidwarf variety. Limited data indicate moderate levels of winterhardiness and resistance to lodging, and good shattering resistance.

Seedling plants are susceptible to current races of leaf rust, but only sporadic leaf rust pustules will appear on adult leaves. Ok101 is resistant to soilborne mosaic, moderately susceptible to tan spot, and susceptible to powdery mildew. It is moderately susceptible to wheat streak mosaic, barley yellow dwarf, and septoria leaf blotch.

Test weight of Ok101 is intermediate to Jagger and 2174. Ok 101 has large, consistent kernel size, and grain protein levels averaged 0.5% less than Custer and 2137. Milling ratings are good to very good. In baking quality evaluations, Ok101 drew consistent comments about its very good internal loaf appearance, but lower than ideal water absorption ratings.

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The pedigree of Ok101 is OK87W663/Mesa//2180; the first parent was essentially derived from Chisholm. The original crosses and selections were made by Dr. Ed Smth, retired OSU wheat breeder and former Wheat Genetics Chair in Agriculture. Dr. Brett Carver made the final selection and purification.

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Foundation Seed of Ok101 is available from Oklahoma Foundation Seed Stocks for planting the fall of 2001.

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Ok101 is the first OSU release under the new variety naming system. "Ok" stands for Oklahoma and is differentiated from experimental lines that have OK numbers. The first digit of 101 indicates a red wheat variety since it is an odd number. A white wheat variety would have an even number. The last two digits of 101 indicate the year of release (2001). With this numbering system, if OSU releases two hard red winter wheat varieties next year, they would be called Ok102 and Ok302.

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*High Quality Seed
*Genetically Identified
*Pure Seed
*Seed With a Pedigree, Breeder Seed – Foundation Seed – Registered Seed – Certified Seed
*Passes all Field Inspections and Laboratory Tests
*Doesn’t Cost, It Pays

For Seed Directory:
OCIA, 368 Ag. Hall
Oklahoma State Univ.
Stillwater, OK 74078

OR

www.okcrop.com

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Financial support for the development of Ok101 came from the Oklahoma Wheat Commission and the Oklahoma Wheat Research Foundation.