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United States Department of Agriculture

Agricultural Research Service

Title: Registration of 'Guymon' wheat

item Carver, Brett
item Hunger, Bob
item Edwards, Jeff
item Rayas-buarte, P
item Klatt, Art
item Porter, David
item Seabourn, Bradford - Brad
item Bai, Guihua
item Dowell, Floyd
item Yan, Liu-ling
item Martin, Bjorn

Submitted to: Journal of Plant Registrations
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 9/10/2007
Publication Date: 1/5/2008
Citation: Carver, B.F., Hunger, B.M., Edwards, J.T., Rayas-Buarte, P., Klatt, A.R., Porter, D.R., Seabourn, B.W., Bai, G., Dowell, F.E., Yan, L., Martin, B.C. 2008. Registration of 'Guymon' wheat. Journal of Plant Registrations. 2(1):33-35. Available:

Interpretive Summary: Germplasm release.

Technical Abstract: 'Guymon' (Reg. No. CV-_______, PI 643133) is a hard white (HW) winter wheat (Triticum aestivum L.) cultivar developed and released cooperatively by the Oklahoma Agric. Exp. Stn. (AES) and the USDA-ARS in 2005. It is recommended for grain-only and dual-purpose production systems in an area of the southern High Plains centered by the city serving as its namesake, Guymon, OK. Guymon is an F2-derived line selected from the cross, OK95G701/WI89-163W, performed in 1995. OK95G701 was eventually released by the Oklahoma AES and the USDA-ARS as 'Intrada', whereas WI89-163W was subsequently named and released by AgriPro-Coker as 'Platte'. Single heads were collected from a F2 bulk population grown at Stillwater, OK in 1997. In the following year, selection was imposed in Stillwater, OK on the F2:3 head rows based on late-spring freeze tolerance, stem extension, spike density and size, kernel size, uniformity of phenotype at harvest maturity, and consistent kernel color. The head-row progeny was evaluated in 1999 at Stillwater and Lahoma, OK, and selected on the basis of forage accumulation, fall vegetative growth habit, simulated-grazing tolerance, spring green-up, heading date, test weight, grain yield, wheat protein content, kernel hardness, and kernel size. Subsequent generations were advanced by bulk-selfing in the field. Minimal roguing of slightly taller variants was performed each year until 2004 despite this line being F2 derived. With an initial frequency of 1.5% red kernels, seed from the 2003 harvest were passed through a single-kernel sorter to reduce the frequency of red kernels to <0.3% (Engineering Research Unit, USDA-ARS-GMPRC, Manhattan, KS). From a final breeder-seed increase in 2004, we detected 0.0 to 0.2% red kernels based on the NaOH-bleach test of multiple samples. As of the 2006-2007 crop year, Guymon is a F2-derived line in the F12 generation.

Last Modified: 10/18/2017
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