Submitted to: Crop Science
Publication Type: Peer reviewed journal
Publication Acceptance Date: 3/31/2002
Publication Date: N/A
Citation: Interpretive Summary: Soybean cyst nematode is a threadlike microscopic worm that lives in the soil and feeds on soybean roots. It is the number one pest of soybean, with yearly losses in the United States as high as $438 million. There are several races of the nematode. S96-2692 soybean germplasm line was released dbecause it has good yield potential and has excellent resistance to most races of the soybean cyst nematode as well as other nematode pests such as root-knot and reniform nematodes. Very few soybean germplasm lines have this combination of high yield potential and broad nematode resistance. S96-2692 is expected to be used as a parent in breeding programs with the objective of producing nematode-resistant varieties to reduce soybean yield loss caused by these pests and reduce the need for pesticides.
Technical Abstract: Soybean [Glycine max (L.) Merr.] germplasm line 'S96-2692' was developed at the Delta Center of the University of Missouri, Portageville, MO. This line has value as a parent because of its good yield potential, broad resistance to populations of soybean cyst nematode (SCN) Heterodera glycines Ichinohe, southern root knot nematode [Meloidogyne incognita (Kofoid and White) Chitwood] and reniform nematode [Rotylenchulus reniformis (Linford and Oliveira)]. S96-2692 originated as an F4 single plant selection from the cross 'Manokin' x S91-1839. Single plants were harvested and individually screened for SCN in the greenhouse to a mixture of races 3, 5 and 14. SCN resistant F5 plant rows were grown in the field at Portageville and single rows uniform for agronomic traits were bulked for yield tests. S96-2692 was screened to individual SCN populations of races 1, 2, 3, 5 and 14 at Portageville and Columbia, Missouri as well as Jackson, Tennessee. S9 96-2692 is mid-group V maturity (RM5.5), about 3d earlier than 'Hutcheson'. It was tested in Missouri from 1997 - 2000 and was evaluated in the Uniform Group V Soybean Tests - Southern States from 1998 - 2000. Yield and plant height are similar to Hutcheson. S96-2692 has white flowers, tawny pubescence and tan pods. Seeds are shiny yellow with black hila. Seed size has averaged 127/mg seed versus 137 mg/seed for Hutcheson. Seed composition on a dry weight basis averages 417 g/kg protein and 197 g/kg oil compared to 410 g/kg protein and 211 g/kg oil for Hutcheson. S96-2692 is resistant to populations of race 1, 2, 3, 5 and 14 of SCN, southern root knot nematode and reniform nematode. Resistance to SCN traces to PI437654 through Hartwig.