A New Tofu and Soy-paste Soybean Cultivar, “Seonyu” with Large Seed and Early Maturity

A new tofu and soy-paste soybean cultivar, Seonyu, was developed at the Yeongnam Agricultural Research Institute (YARI) in 2004. Seonyu was selected from a cross Suwon 162/YS 548. The preliminary, advanced, and regional yield trials for evaluation and selection of this line (Suwon 227) were carried out from 2000 to 2004. It has a determinate growth habit, purple flower, gray pubescence, gray pod color, yellow seed coat, yellow cotyledon, globular seed shape, oval leaflet shape and large seed size (29.6 grams per 100 seeds), and it was 8 days earlier in maturity than the check variety Taekwang. In the seed quality such an oil and isoflavone contents, Seonyu was better than those of check variety, and it has good adaptability for tofu and soy-paste. It also has been identified to have mild resistance to necrotic symptom (SMV-N) of soybean mosaic virus which is the troublesome soybean disease. The average yield of Seonyu was 2.44 ton per hectare in the regional yield trials (RYT) carried out for three years from 2002 to 2004 which was 1 percent lower than one of the check variety Taekwang.