Submitted to: Phytopathology
Publication Type: Abstract Only
Publication Acceptance Date: 5/1/2006
Publication Date: 6/1/2006
Citation: Gao, X., Hartman, G.L., Niblack, T.L. 2006. Early infection of soybean roots by fusarium solani f. sp. glycines. Phytopathology. 96:S38.
Technical Abstract: Fusarium solani f. sp. glycines, the causal organism of soybean sudden death syndrome (SDS), is a major pathogen of soybean in the United States. SDS is known as a late season disease although it is known that the fungus infects soybean early in the season; however, it is not known how early infection takes place in the field. In 2005, two field trials were conducted to monitor the infection and colonization of F. solani f. sp. glycines in the roots in two Illinois fields. Soybean seedlings at the emergence stage were first sampled 18 days after planting. F. solani f. sp. glycines DNA in soybean roots were determined with a real-time quantitative polymerase chain reaction (QPCR) assay. The results demonstrated soybean roots were colonized by F. solani f. sp. glycines as young seedlings when plants were emerging from the soil in both fields. The F. solani f. sp. glycines DNA in soybean roots ranged from 1.0 to 103.6 pg/g roots in representative plots. Symptoms of SDS on young seedlings were observed in the field after inoculation with F. solani f. sp. glycines grown on sorghum. Protection of soybean seedlings from F. solani f. sp. glycines with seed treatment and other measures may be effective in preventing early season colonization.