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‘Prohio’ soybean [Glycine max (L.) Merr.] (Reg. No. CV-497, PI 643146) was developed jointly by the USDA-ARS and The Ohio Agricultural Research and Development Center (OARDC) in Wooster, OH, and was released as a high-yielding maturity group IV (relative maturity 4.1) non–Roundup Ready cultivar with relatively high seed protein. Prohio is a selection from a cross between HC94-81PR × ‘A2506’. Both in the 2004 northern Regional Preliminary Test IV and in the 2005 northern Regional Uniform Test IV, Prohio had the greatest seed protein, while its oil content was slightly above the average for these tests. In South Region normal varieties evaluation of 2005 Ohio Soybean Performance Trials, Prohio had higher yields than all other public varieties in the test and had numerically highest seed protein among all lines in the trial. Prohio is a relatively high protein soybean cultivar with high yield potential, particularly in southern Ohio.

Strong-Rpslk (Reg. No. GP-359, PI 644025) soybean [Glycine max (L.) Merr.] germplasm line was developed jointly by the USDA-ARS and The Ohio Agricultural Research and Development Center (OARDC) at Wooster, OH. It was released because it carried the Rps1k gene for race specific resistance to Phytophthora root and stem rot (caused by Phytophthora sojae Kaufmann & Gerdemann) in the semidwarf background of cultivar Strong. Strong, which has the Rps1a gene, is well known for its adaptation to high yield environments where excessive vegetative growth and early lodging limit the yield potential of taller indeterminate soybean cultivars. Strong-Rpslk was developed by backcrossing the Rps1k gene from cultivar Sprite 87 into Strong. Seeds from the BC 5 F 2:3 plants homozygous for the Rps1 k gene were bulked to make Strong-Rpslk. It was evaluated for agronomic performance in local and regional tests. Performance of Strong-Rpslk was comparable to that of Strong. The Rps1 k gene provides resistance against a wider range the P. sojae populations that are present in the North-Central U.S. soybean-growing region than does the Rps1a gene. Thus, Strong-Rps1k may be useful for breeders and researchers interested in developing new germplasm with resistance to Phytophthora root and stem rot with specific adaptation to high-yielding environments.