|Warburton, Marilyn - UNIV OF ILLINOIS|
|Brown-Guedira, Gina - UNIV OF ILLINOIS|
Submitted to: Crop Science
Publication Type: Germplasm Release
Publication Acceptance Date: January 20, 2004
Publication Date: July 1, 2004
Citation: Warburton, M.L., Brown-Guedira, G.L., Nelson, R.L. Registration of lg92-4208, lg94-1128, lg94-1906, and lg94-4667 soybean germplasm. Crop Science. 44:1501-1502 Interpretive Summary: This is a germplasm release and no interpretive summary is required.
Technical Abstract: Only four ancestral lines account for nearly 50% of all of the genes in soybean varieties currently being grown in the U.S. Expanding the diversity of the genetic base of U.S. soybean production could have both short- and long-term positive effects on yield improvement. We have developed and released four experimental lines that can be used for that purpose. LG92-4208 is a selection from LG84-1269 x Chamberlain. LG84-1269 is an F5 selection from PI 227333 x PI 91730-1. LG92-4208 was tested at 9 locations in the 1998 Uniform Preliminary Test IIIA. LG92-4208 was two days earlier than Macon and yielded 4% less. LG94-1128 is a selection from LG85-3343 x LG87-1991. LG85-3343 is an F5 selection from PI 361064 x PI 407710 and LG87-1991 is an F6 selection from PI 189930 x PI 68600. This is the first soybean germplasm release for high yield that is derived solely from exotic germplasm not in the pedigrees of U.S. soybean cultivars. In the Uniform Preliminary Test IIA in 1998, LG94-1128 was 1 day later and yielded 5% less than IA2021. LG94-1906 is a selection from PI 468377 x A3205. LG94-1906 was tested in the Uniform Preliminary Test IIA in 1998 and was 3 day later and yielded 7% less than IA2021. LG94-4667 is a selection from PI 458511 x Flyer. LG94-4667 was tested in the Uniform Preliminary Test IVA in 1998 and was 2 day earlier and yielded 15% less than HS93-4118. The eight exotic parental lines are all yellow-seeded, grain-type soybeans that have been introduced into the United States over the past 75 years. All of the exotic parents in these releases have been characterized using RAPD fragments and SSR alleles and compared to the major ancestral lines of current U.S. cultivars. Based on analysis of these DNA marker data these eight introductions were classified into four genetic groups but two could not be consistently assigned to any group. PIs 189930, 227333 and 407710 were placed in the same group with the U.S. ancestral line Korean, which contributed less than 1% to the currently used gene pool. PI 468377 also clustered with only one major U.S. ancestral line, Mandarin (Ottawa), but it contributed over 12% of the current U.S. gene pool. PI 91730-1 was in the same cluster as Richland and Haberlandt, which combined contributed 9% of the genes to current U.S. cultivars based on pedigree analysis. PI 68600, PI 361064 and PI 458511 did not cluster with any U.S. ancestral lines.