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a USDA-Agricultural Research Service, Plant Science and Entomology Research Unit, Dep. of Agronomy, 2001 Throckmorton Plant Science Center, Kansas State Univ., Manhattan, KS, 66506
b CIMMYT Applied Biotechnology Center, Lisboa 27, Apdo Postal 6-641 06600 Mexico DF, Mexico
c USDA-Agricultural Research Service, Soybean/Maize Germplasm, Pathology, and Genetics Research Unit, Dep. of Crop Sciences, 1101 W. Peabody Dr., Univ. of Illinois, Urbana, IL 61801
* Corresponding author (rlnelson{at}uiuc.edu)
The soybean [Glycine max (L.) Merr.] germplasm lines LG92-1255 (Reg. no. GP-283, PI 615553), LG93-7054 (Reg. no. GP-284, PI 615554), LG93-7654 (Reg. no. GP-285, PI 615555), and LG93-7792 (Reg. no. GP-286, PI 615556) were cooperatively developed and released in 1998 by the USDA-ARS 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 USA. They were challenged with and found to be susceptible to races 4 and 7 of Phytophthora sojae M.J. Kaufmann & J.W. Gerdemann. No other data are available on reaction to soybean pathogens for these lines. All four lines were developed through an early generation testing procedure. The progenitor populations were yield tested as F2 families in the F3 and F4 generations. The released lines were derived from single-plant selections made in the F5 generation and bulk harvested in the F6.
LG92-1255 is an F6 line from LG84-1291 x ‘A3127’. A3127 is from ‘Williams’ x ‘Essex’ (Bernard and Lindahl, 1972; Smith and Camper, 1973) and was used with permission from the Asgrow Seed Company. LG84-1291 is an F5 selection from PI 68522 x ‘Hobbit’ (Bernard et al., 1987a; Cooper et al., 1991). LG92-1255 has indeterminate stem termination and is classified as late group II maturity. It has purple flowers, tawny pubescence, tan pods, yellow seed coat, and black hilum. In tests at six locations in central Illinois, LG92-1255 was 6 d later in maturity and yielded 20% more than ‘IA2021’. At 12 locations in the Uniform Preliminary Test IIB in 1997, it was also 6 d later than IA2021 but yielded 3% less (Wilcox, 1997). LG92-1255 was higher in protein (411 vs. 372 g kg–1) and lower in oil (207 vs. 221 g kg–1) than IA2021 but the two lines were similar in other agronomic traits measured (Wilcox, 1997).
LG93-7054 is an F6 line from LG85-3343 x ‘S42-30’. LG85-3343 is an F5 selection from PI 361064 x PI 407710 (Bernard et al., 1987b). S42-30 is from Essex x ‘AgriPro 35’ and was used with permission from the Northrup King Company. AgriPro 35 is from L15 x ‘Cutler’ (Probst et al., 1969) and L15 is from ‘Wayne’(5) x ‘Clark 63’ with selection for Rps1 (Bernard, 1966; Williams and Bernard, 1964). LG93-7054 has indeterminate stem termination and is classified as late group II maturity. It has purple flowers, gray pubescence, brown pods, yellow seed coat, and imperfect black hilum. In tests at six locations in central Illinois, LG93-7054 was 5 d later in maturity and yielded 6% more than IA2021. At 12 locations in the Uniform Preliminary Test IIB in 1997, it was also 5 d later than IA2021 but yielded 3% less (Wilcox, 1997). LG93-7054 was higher in protein (414 vs. 372 g kg–1), lower in oil (200 vs. 221 g kg–1), and had smaller seed size (15.3 vs. 17.4 cg seed–1) than IA2021 but the two lines were similar in all other agronomic traits measured (Wilcox, 1997).
LG93-7654 is an F6 line from LG86-2734 x ‘A3205’. LG86-2734 is an F5 selection from PI 424195B x PI 361066A (Bernard et al., 1987b). A3205 is from ‘S1474’ x A3127 and was used with permission from the Asgrow Seed Company. S1474 was developed by Northrup King Company from ‘Hark’ x Wayne (Weber, 1967). LG93-7654 has indeterminate stem termination and is classified as late group III maturity. It has purple flowers, tawny pubescence, brown pods, yellow seed coat, and brown hilum. In tests at six locations in central Illinois, LG93-7654 was 1 d earlier in maturity and yielded 3% less than ‘Macon’. At 10 locations in the Uniform Preliminary Test IIIA in 1997, it was 2 d earlier than Macon and yielded 4% less (Wilcox, 1997). LG93-7654 was higher in protein (421 vs. 407 g kg–1), and smaller in seed size (15.4 vs. 18.0 cg seed–1) but similar in oil (193 vs. 194 g kg–1) and in all other agronomic traits measured compared with Macon (Wilcox, 1997).
LG93-7792 is an F6 line from LG86-6989 x A3205. LG86-6989 is an F9 selection from PI 253665D x PI 283331 (Bernard et al., 1987b). LG93-7792 has indeterminate stem termination and is classified as early group IV maturity. It has purple flowers, tawny pubescence, brown pods, yellow seed coat, and brown hilum. In tests at six locations in central Illinois, LG93-7654 was 6 d later in maturity and yielded 3% less than Macon. At eight locations in the Uniform Preliminary Test IVA in 1997, it was 2 d later than Macon and yielded 3% less (Wilcox, 1997). LG93-7654 was higher in protein (411 vs. 401 g kg–1) lower in oil (193 vs. 205 g kg–1) and had smaller seeds (16.2 vs. 18.1 cg seed–1) than Macon but the two lines were similar in all other agronomic traits measured (Wilcox, 1997).
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. PI 68658 was imported in 1926 from northeast China (Bernard et al., 1987a). PI 253665D originated in China and was brought to the USA in 1958 (Bernard et al., 1987b). PI 283331 came from Morocco in 1958 (Bernard et al., 1987b). PIs 361064 and 361066A are experimental lines that were developed in Yugoslavia and brought to the USA in 1971 (Bernard et al., 1987b). PI 407710 is a primitive Chinese cultivar obtained from Heilongjiang province in 1976 (Bernard et al., 1987b). PI 424195B was developed in Hungary and imported to the USA in 1978 (Bernard et al., 1987b). These introductions do not occur in the pedigrees of any released cultivars or germplasm in the USA.
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 by RAPD fragments and compared with the major ancestral lines of current U.S. cultivars (Brown-Guedira et al., 2000). These five accessions were classified into four different genetic groups. PI 283331 and PI 68522 were in two genetic groups that contained no U.S. ancestral lines. PI 253665D and PI 407710 were in the same genetic group that included ancestral lines that contributed less than 1% of the genes in current U.S. cultivars (Brown-Guedira et al., 2000). PI 361064 was grouped with major U.S. ancestral lines including S-100 and Lincoln when the clustering was based on 109 RAPD fragments and three SSR loci (Brown-Guedira et al., 2000) but did not cluster with any U.S. ancestral lines or exotic accessions and was classified as an outlier when the clustering was based on 281 RAPD fragments (Thompson et al., 1998)
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.
NOTES
Accepted for publication May 31, 2003.
REFERENCES
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