Submitted to: National American Phytopathology Meetings
Publication Type: Abstract Only
Publication Acceptance Date: 11/15/2000
Publication Date: N/A
Technical Abstract: Phytophthora root and stem rot caused by Phytophthora sojae is a devastating disease in most soybean growing regions. This disease has been managed by the use of single dominant resistance genes in soybean. Sources of resistance other than from soybean have not been used. The wild soybean, Glycine soja, and G. max are cross compatible, contain 2n=40 chromosomes and produce fertile F1 hybrids. The objective of this study was to evaluate 1102 G. soja accessions for resistance to race 3 of P. sojae. Using the plug-inoculation method, seven accessions were found that had complete resistance to race 3. These accessions are from diverse locations and are in a range of maturity groups from 000 to VI. In addition, these accessions were screened for resistance to races 7, 17, and 25. Several accessions were resistant to all four races. Further research is being done to characterize these sources of resistance in G. soja.