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GERMPLASM

Registration of Stout-Rps1k Soybean Germplasm Line

^a USDA-ARS, Corn and Soybean Research Unit, and Dep. of Horticulture and Crop Science, The Ohio State Univ., 215-A Williams Hall, 1680 Madison Ave., Wooster, OH 44691
^b Dep. of Plant Pathology, The Ohio State Univ., Wooster, OH 44691

^* Corresponding author (mian.3{at}osu.edu).

ABSTRACT

Stout-Rps1k soybean [Glycine max (L.) Merr.]) (Reg. No. GP-360, PI 644024) germplasm line was developed jointly by the USDA-ARS and the Ohio Agricultural Research and Development Center in Wooster, OH. It was released in October 2006 because it had the Rps1k gene for race-specific resistance to Phytophthora root and stem rot (caused by Phytophthora sojae, M.J. Kaufmann and J.W. Gerdemann) in the semidwarf cultivar Stout. Stout-Rps1k, a maturity group III (RM 3.3) germplasm, was developed by backcrossing the Rps1k gene from cultivar Sprite 87 into Stout. BC₅–derived lines homozygous for the Rps1k gene were bulked and evaluated for agronomic performance in local and regional tests. Agronomic performance of Stout-Rps1k was similar to the recurrent parent Stout. The Rps1k gene conditions resistance against a wider range of P. sojae populations in the north-central soybean growing region of the United States than the Rps1a gene. Thus, Stout-Rps1k should be useful for breeders and researchers interested in developing new soybean lines with broad resistance to P. sojae populations and specific adaptation to high-yield environments.