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a USDA-ARS and Dep. of Crop Science, North Carolina State Univ., Raleigh, NC 27695-7631
b Dep. of Crop Science, North Carolina State Univ., Raleigh, NC 27695-7631
* Corresponding author (tommy_carter{at}ncsu.edu)
‘N7103’ soybean [Glycine max (L.) Merr.] (Reg. no. CV-445, PI 615695) was developed by the U.S. Department of Agriculture, Agricultural Research Service (USDA-ARS). It was released in May 2000 because of its high yield and its potential use in the Japanese soyfoods export market. It is a small-seeded maturity group VII cultivar adapted to the South Atlantic Coast and southeastern USA.
N7103, previously identified as N94-7441, is an F4-derived selection from the cross of the small-seeded genotypes, NTCPR90-143 and ‘Pearl’ (Carter et al., 1995). The parents of NTCPR90-143 were ‘Gasoy 17’ (Baker and Harris, 1979) and ‘Vance’. The parents of Pearl were ‘G80-1515’ x Vance. G80-1515 was derived from a cross of ‘Pickett 71’ (Hartwig et al., 1971) x ‘Bedford’ (Hartwig and Epps, 1978). Vance was derived from the cross of ‘Essex’ and an unknown wild (Glycine soja Sieb. and Zucc.) or semiwild soybean (Smith and Camper, 1973). NTCPR90-143 and Pearl were crossed in 1991 at Raleigh, NC, and the F1 was grown at the USDA-ARS Tropical Agriculture Research Station (TARS), Isabela, PR, the following winter. The F2 and F3 plants were advanced using single seed descent at Clayton, NC, in 1992 and the following winter at TARS. In 1993, individual F4 plants were harvested and assayed for 100-seed weight and visual appearance at Clayton, NC. Approximately 40 F4 plants were selected for progeny increase at Clayton, NC, in 1994. N7103 was identified as a promising breeding line in 1995 and continued to perform well in North Carolina in 1996 and 1997. N7103 was tested at 7 and 14 southern regional locations in 1996 and 1997, respectively, as part of the USDA Cooperative Uniform Soybean Yield Trials (Tyler and Bell, 1998). N7103 was also yield tested in fifteen North Carolina environments by the North Carolina Official Variety Testing Program from 1997 through 1999 (Bowman, 1999).
N7103 matures approximately the same day as ‘Haskell’ (Boerma et al., 1994) and is adapted to similar latitudes (approximately 31–37° North). In 21 regional USDA Cooperative Uniform Soybean Yield Trials, it produced 4% lower yield than Haskell in wide (95 cm) row spacings when grown under full season conditions. In fifteen environments in the North Carolina Official Variety Testing Program, N7103 produced 2% lower yield than Haskell or ‘Cook’ (Boerma et al., 1992). In four North Carolina environments, the 100-seed weight of N7103 averaged 7.8 g and was smaller than that of Cook (16.1 g) or Pearl (8.1 g). Average seed protein concentration of N7103 was higher, and oil concentration lower, than Haskell (437 and 171 g kg-1 vs. 408 and 202 g kg-1) in 1997 on a 0% moisture basis.
N7103 was more lodging resistant than Haskell in 1997, exhibiting an average lodging score of 1, compared to Haskell's average score of 2 [a score of 1 indicates no lodging while 5 indicates a prostrate plant]. N7103 plant height averaged 17 cm shorter than Haskell. N7103 is resistant to pod dehiscence (shattering) after maturation, even when harvest is delayed extensively. N7103 has yellow seed with shiny luster and clear hila, white flowers, gray pubescence, determinate growth habit, and narrow leaves. N7103 is resistant to Soybean mosaic virus, frog eye leaf spot (caused by Cercospora sojina Hara), and bacterial pustule [caused by Xanthomonas campestris pv. glycines (Nakano) Dye], but susceptible to root knot (Meloidogyne) species of nematode. The small seed size of N7103, compared to commodity-type varieties, limits its use to specialty purposes.
Breeder seed of N7103 will be maintained by the Soybean and Nitrogen Fixation Unit, USDA-ARS, 3127 Ligon St., Raleigh, NC 27607. Small quantities can be obtained by request from Thomas E. Carter, Jr. Seed of this release will be deposited in the National Plant Germplasm System where it will be available for research purposes, including development and commercialization of new cultivars. N7103 will be submitted for U.S. Plant Variety Protection. It is requested that appropriate recognition be made if this germplasm contributes to the development of a new breeding line or cultivar. USDA intends to grant an exclusive license for production and sale of this release to North Carolina State University, Raleigh, NC.
NOTES
Accepted for publication October 31, 2002.
REFERENCES
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T.E. Carter Jr., J.W. Burton, X. Zhou, Z. Cui, M.R. Villagarcia, M.O. Fountain, A.S. Niewoehner, and J.F. Wilder Registration of 'N7101' Soybean Crop Sci., May 1, 2003; 43(3): 1127 - 1128. [Full Text] [PDF]
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