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.
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