Location: Foreign Disease-weed Science ResearchTitle: Registration of eight soybean germplasm lines resistant to soybean rust) Author
Submitted to: Journal of Plant Registrations
Publication Type: Peer reviewed journal
Publication Acceptance Date: 5/10/2013
Publication Date: 9/20/2013
Publication URL: http://handle.nal.usda.gov/10113/57918
Citation: Diers, B.W., Kim, K., Frederick, R.D., Hartman, G.L., Unfried, J.R., Schultz, S.J., Cary, T.R. 2013. Registration of eight soybean germplasm lines resistant to soybean rust. Journal of Plant Registrations. 8:96-101. Interpretive Summary: Phakopsora pachyrhizi is an obligate fungal pathogen that causes the foliar disease known as soybean rust (SBR). Six resistance genes have been identified in soybeans that recognize specific isolates of the pathogen. It is important to incorporate SBR resistance into soybean germplasm as a precaution against potential disease outbreaks. Four SBR resistance genes were backcrossed into soybean maturity group II and IV backgrounds for the Midwestern US. Seed of these eight lines are available to soybean breeders wanting to develop SBR resistant cultivars and germplasm adapted to this region.
Technical Abstract: Soybean rust (SBR), caused by the fungus Phakopsora pachyrhizi Sydow is a threat to soybean [Glycine max (L.) Merr.] production worldwide. Although SBR has not caused widespread damage in North America, the crop is still threatened by the disease because most cultivars in production are susceptible. We backcrossed the soybean rust resistance genes Rpp1, Rpp1-b, Rpp3(Hyuuga), and Rpp5 into a maturity group (MG) II and a MG IV background to develop Midwestern USA adapted soybean germplasm with SBR resistance. The backcross lines were tested for SBR resistance in greenhouse tests and for agronomic traits in multi-location field tests. The four MG II soybean germplasm lines LD10-30052 (Reg. No. GP-383, PI 668384), LD10-14321 (Reg. No. GP-384, PI 668385), LD10-14284 (Reg. No. GP- 385, PI 668386), and LD09-16057 (Reg. No. GP-386, PI 668387) and the four MG IV germplasm lines LD10-14205 (Reg. No. GP-389, PI 668390), LD10-13091 (Reg. No. GP-387, PI 668388), LD10-14274 (Reg. No. GP-388, PI 668389), and 08RST5-10 (Reg. No. GP-390, PI 668391) developed through these efforts were released by the Illinois Agricultural Experiment Station in April 2012. The lines carry SBR resistance genes and are indistinguishable from the recurrent parents for morphological traits and with only a few exceptions, are not significantly different than their recurrent parents for agronomic traits including seed yield. These lines should be useful to soybean breeders who wish to develop rust resistant cultivars.