Soybean [Glycine max (L.) Merr.] seed is an important dietary source of protein, oil, carbohydrates, isoflavones, and other nutrients for humans and animals. Raffinose and stachyose are the main antinutritional factors in soybean seed. They are carbohydrates belonging to the raffinose family of oligosaccharides, which are not readily digested in humans and cause flatulence or diarrhea. The genetic reduction of the raffinose and stachyose contents in mature soybean seeds will improve the nutritional value of soybean. The objective of this research was to evaluate agronomic traits with 10 F 6 strains selected from breeding populations derived from a cross among seven parents. The contents of raffinose and stachyose in mature seeds were detected by high-performance liquid chromatography. Agronomic traits such as flower color, flowering date, harvesting date, lodging, plant height, seed coat color, hilum color, 100 seed weight, and yield were evaluated. Ten intermediate parents showed low raffinose and stachyose contents. The intermediate parent 883-1 had a small seed size, six intermediate parents (15A1, 15D1, RS-5, RS-33, RS-64, and RS-70) had a medium seed size, and two intermediate parents (14G20 and RS-21) had a large seed size. The intermediate parent RS-21 had a black seed coat and a green cotyledon. Four intermediate parents (883-1, 14G20, RS-5, and RS-21) had elite agronomic traits. The new intermediate parents developed through this study will be used to develop improved soybean cultivars with low contents of raffinose and stachyose.
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