Skip to main content
ARS Home » Research » Publications at this Location » Publication #204394
Title: Registration of Stout-Rps1k Soybean Germplasm with Phytophthora Stem and Root Rot Resistance

Author
item Mian, Rouf
item Cooper, Richard
item DORRANCE, ANNE - OSU

Submitted to: Journal of Plant Registrations
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 6/15/2008
Publication Date: 9/1/2008
Citation: Mian, R.M., Cooper, R.L., Dorrance, A. 2008. Registration of Stout-Rps1k Soybean Germplasm with Phytophthora Stem and Root Rot Resistance. Journal of Plant Registrations. 2:255-257.

Interpretive Summary: Phytophthora stem and root rot causes the second biggest yield loss of soybean in the North Central soybean growing region of the USA. ‘Stout-Rps1k’ soybean [Glycine max (L.) Merr.] gemplasm line was developed jointly by the USDA-Agricultural Research Service and the Ohio Agricultural Research and Development Center (OARDC) at Wooster, OH. It was released in October 2006, because it carries Rps1k gene for race specific resistance to Phytophthora root and stem rot caused by Phytophthora sojae. Stout 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. Stout-Rps1k was developed in Ohio by backcrossing the Rps1k gene from cultivar Sprite 87 into the high yielding maturity group III determinate semi-dwarf cultivar Stout. Stout-Rps1k has similar yields potential as cultivar Stout. Averaged over 15 locations, it yielded the same as the semi-dwarf check cultivar Apex in multi-state trials in 2003. It has approximately same maturity, lodging score, plant height, seed size and seed quality, and protein and oil contents as those of Stout. Like Stout, Stout-Rps1k has white flower, tawny pubescence, tan pods, and dull yellow seeds with black hila. This novel germplasm will be useful to soybean scientists interested in Phytophthora stem and root rot of soybean.

Technical Abstract: ‘Stout-Rps1k’ soybean [Glycine max (L.) Merr.] gemplasm line was developed jointly by the USDA-Agricultural Research Service and the Ohio Agricultural Research and Development Center (OARDC) at Wooster, OH. It was released in October 2006, because it carries Rps1k gene for race specific resistance to Phytophthora root and stem rot caused by Phytophthora sojae. Stout-Rps1k was developed in Ohio by backcrossing the Rps1k gene from cultivar Sprite 87 into the high yielding maturity group III determinate semi-dwarf cultivar Stout. Stout 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. Progeny from each backcross generation were screened against race 3 of P. sojae to identify plants carrying the Rps1k gene. In 2001, BC5F5 lines homozygous for the Rps1k gene were bulked to form Stout-Rps1k. In three trials in high yielding irrigated fields in Wooster, Ohio (2002, 2003, and 2004) Stout-Rps1k had similar yields as cultivar Stout. In 2003, Stout-Rps1k (originally designated as HC94-421BC) was entered in the Regional Uniform Test III (UT-III) and averaged over 15 locations, it yielded the same as the semi-dwarf check cultivar Apex. It has approximately same maturity, lodging score, plant height, seed size and seed quality, and protein and oil contents as those of Stout. Like Stout, Stout-Rps1k has white flower, tawny pubescence, tan pods, and dull yellow seeds with black hila.