Project Number: 6402-21220-009-04
Project Type: Reimbursable

Start Date: Oct 01, 2006
End Date: May 31, 2008

Objective:
Broaden soybean germplasm base for genetic resistance to new and emerging nematode populations and integrate cultural practices to augment sustainability to host plant resistance for soybean cyst nematode.

Approach:
In the U.S. publicly available soybean cultivars trace their nematode resistance to Peking, PI 88788 and/or PI 437654. Nematodes have adapted to both Peking and PI 88788. New poplations with virulence on PI 437654 (cv. Hartwig) have been found. PI lines 567516C and 437655, are resistant to most virulent nematodes. Other unique sources of resistance have been identified in soybean. Characterize new sources of resistence to identify and broaden the number of resistance genes for nematodes. Use marker assisted selection for gene pyramiding and increased breeding efficiency. Develop germplasm with new genes. Determine influence of resistant germplasm and non-host crops on nematode variability. Determine dynamics of nematode egg population density in field plots. Manage nematode populations through reduced tillage practices, early maturity soybeans, manipulation of pH and cover/trap crop.