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GERMPLASM

Registration of RMUP-C5, a Random Mated Population of Upland Cotton Germplasm

^a USDA-ARS, P.O. Box 5367, Mississippi State, MS 39762
^b Dep. of Plant and Soil Sciences, Mississippi State Univ., P.O. Box 5367, Mississippi State, MS 39762
^c Dep. of Crop Science, North Carolina State Univ., Raleigh, NC 27695
^d Mississippi Agriculture and Forestry Experiment Station, Mississippi State, MS 39762, current address: Oklahoma State Agricultural Experiment Station, Oklahoma State Univ., Stillwater, OK 74074
^e Cotton Incorporated, 6399 Weston Pkwy., Cary, NC. Joint contribution of USDA, ARS, Mississippi State University, North Carolina State University, and Cotton Incorporated. Journal paper J-11289 of Mississippi Agricultural and Forestry Experiment Station. Mention of trademark or proprietary product does not constitute a guarantee or warranty of the product by the U.S. Department of Agriculture and does not imply its approval to the exclusion of other products that may also be suitable

^* Corresponding author (johnie.jenkins{at}ars.usda.gov).

ABSTRACT

RMUP-C5 (Random Mated Upland Population Cycle 5) (Reg. No. GP-893, PI 652942) is a unique random mated germplasm population of Upland cotton (Gossypium hirsutum L.) involving six cycles of random mating beginning with an 11 parent half diallel. This germplasm was developed through cooperative research by the USDA-ARS, Mississippi Agricultural and Forestry Experiment Station, North Carolina State Agricultural Experiment Station, and Cotton Incorporated. Parents used in development represented nonrelated or distantly related cultivars or breeding lines from across the U.S. Cotton Belt. The bulked pollen method of pollination was used in the development, and there were six cycles of random mating, with intercrossing of the F₁ considered cycle zero. Selfed seed of C₅S₁ has been released. Changes in correlations between traits among parents, C₀, and C₅ cycles show that after random mating, the C₅ population has recombinations that should be useful for selection and cultivar development. Because this germplasm represents random mating among 11 very diverse breeding programs and includes parents from the major seed breeding companies, this population should be of value to breeders across the U.S. Cotton Belt.