Submitted to: Crop Science
Publication Type: Germplasm release
Publication Acceptance Date: 10/31/2002
Publication Date: 5/11/2003
Citation: Carter Jr, T.E., Burton, J.W., Zhou, X., Zhanglin, C., Villagarcia, M., Fountain, M., Niewoehner, A.S., Wilder, J. 2003. Registration of 'N7102' soybean. Crop Science, Vol. 43:1128-1129. Interpretive Summary: Soybean production in the Far East in the 1990's, as in ancient times, is primarily for food. Chinese writings more than 2000 years ago refer to soybean as one of the five sacred food grains. In Japan, NATTO is an important soyfood eaten as a companion to rice and first popularized about 1000 AD. Noted for its strong fermented aroma and dark brown color, natto has quite a consumer following in modern Japan and many food companies compete in this lucrative market. Because of the high population in Japan, the country is not self sufficient in soybean production and pays handsomely for specialty beans from the USA. For natto type specialty beans, Japanese buyers pay U.S. farmers up to $6 per bushel above market price. Although U.S. farmers are vitally interested in this lucrative market, growing the right variety for Japan's needs has proven difficult. Most U.S. commodity-type soybeans are unsuited to the natto market. Dr. Carter has been working on this problem and has recently released a new variety, N7102, specifically to help US farmers compete in the Japanese natto market.
Technical Abstract: N7102 soybean was developed by the USDA-ARS because of its potential use in the Japanese soyfoods export market. They are small-seeded maturity group VII cultivars adapted to the South Atlantic Coast and Southeastern USA. N7102, previously identified as 'NTCPR92-115', is an F6-derived selection from the cross of the small-seeded genotypes 'Vance' and 'Jizuka'. N7102 matures approximately two days earlier than Cook and produced 18 % lower yields when grown in wide (95 cm) row spacings under full-season conditions in nine different North Carolina environments. The 100-seed weight of N7102 averaged 7.5 g, which was smaller than that of Cook (16.7 g) or 'Pearl' (8.7 g). In the regional USDA Cooperative Uniform Soybean Yield Trials, the average seed protein and oil concentrations on a zero percent moisture basis for N7102 and 'Haskell' were 47.4 and 18.1%, and 42.8 and 20.1%, respectively. In North Carolina, N7102 is lodging susceptible but resistant to pod dehiscence after maturation, even when harvest is delayed extensively. N7102 has yellow seed with shiny luster and clear hila, purple flowers, gray pubescence, determinate growth habit, and narrow leaves. N7101 is resistant to soybean mosaic virus, frog eye leaf spot, and bacterial pustule, but susceptible to root knot species of nematode. The small seed size and lower yield potential of N7102, compared to commodity-type varieties, limits its use to niche markets.