|Warburton, M - CIMMYT CTR, MEXICO|
Submitted to: Crop Science
Publication Type: Other
Publication Acceptance Date: May 30, 2003
Publication Date: May 1, 2004
Citation: Brown-Guedira, G.L., Warburton, M.L., Nelson, R.L. 2004. Registration of LG-1255, LG93-7054, LG93-7654, and LG93-7792 soybean germplasm. Crop Science. 44:356-357. Interpretive Summary: Only three ancestral lines contributed more than 50% of the genes in all soybean varieties grown in the northern U.S. This narrow genetic base may be having a negative impact on the yield improvement so there is great interest in high yielding experimental lines with genetically diverse parents but with yields as high as current varieties. These lines combine high yield with unique genetic diversity and are being registered in Crop Science to make them available to all soybean breeders. The pedigrees of these lines range from 25 to 50% exotic germplasm and in regional testing averaged 97% of the yield of the check cultivar in the test. There are seven exotic parental lines (PI 68522, PI 253665D, PI 283331, PI 361064, 361066A, PI 407710, and PI 424195B) from the USDA Soybean Germplasm Collection in the pedigrees of these lines. Five (PI 68522, PI 253665D, PI 283331, PI 361064, and PI 407710) of the seven exotic lines were compared at the DNA level with the ancestral lines of current U.S. cultivars and were genetically distinct from these ancestral lines and were categorized into four different genetic groups based on DNA differences. Because these experimental varieties are high yielding and genetically different from current commercial varieties they will be valuable to soybean breeders for use as parents in developing new varieties.
Technical Abstract: The soybean [Glycine max (L.) Merr.] germplasm lines LG92-1255 (PI 615553), LG93-7054 (PI 615554), LG93-7654 (PI 615555), and LG93-7792 (PI 615556) were cooperatively developed and released in 1998 by the USDA-Agricultural Research Service and the Illinois Agricultural Experiment Station for use as parental lines in yield improvement programs. These lines combine high yield with unique genetic diversity not currently present in the commercially used gene pool in the U.S. The pedigrees of these lines range from 25 to 50% exotic germplasm and in regional testing averaged 97% of the yield of check cultivar in the test. The seven exotic parental lines (PI 68522, PI 253665D, PI 283331, PI 361064, 361066A, PI 407710, and PI 424195B) are yellow-seeded, grain-type soybeans in MG I, II or III. Five (PI 68522, PI 253665D, PI 283331, PI 361064,and PI 407710) of the seven exotic accessions used to develop these experimental lines have been characterized using RAPD fragments and compared to the major ancestral lines of current U.S. cultivars. These five accessions were classified into four different genetic groups. Seeds of LG92-1255, LG93-7054, LG93-7654, and LG93-7792 will be deposited in the USDA Soybean Germplasm Collection and may be requested from the corresponding author for research purposes, including development and commercialization of new cultivars. It is requested that appropriate recognition be made if this germplasm contributes to the development of a new breeding line or cultivar.