Submitted to: Agronomy Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: 11/14/2000
Publication Date: N/A
Technical Abstract: Sudden death syndrome (SDS), caused by Fusarium solani f. sp. glycines (FSG), has caused increased damage to soybean production in recent years. Disease evaluation of the ancestors of modern-day cultivars may help explain the reactions of modern-day cultivars to SDS. Ninety soybean ancestral lines representing 99.97% of the genes in modern US cultivars were screened in the greenhouse for resistance to FSG. Soybean seeds were planted in trays containing a 1:1 ratio of sand and soil mix directly above the SDS inoculum (sorghum infested with FSG). The lines were compared to the susceptible check, Great Lakes 3302, and the resistant checks, PI 520.733 and PI 567.374. Plants were rated for disease severity using a 1 to 5 scale 12 to 21 days after planting. Of the 90 ancestral lines, nine had disease ratings equal to PI 520.733 and PI 567.374. Aoda (PI 548301), Kim (PI 548587), Strain No. 18 (PI 180501), Sioux (PI 548414), Kisaya (PI 171450), Mammoth Yellow (PI 210352), PI 54615-1, T117 (PI 548169), and Manitoba Brown (PI 153217) were not in the backgrounds of public cultivars that have been found to be partially resistant to FSG.