Submitted to: National American Phytopathology Meetings
Publication Type: Abstract Only
Publication Acceptance Date: 11/15/2000
Publication Date: N/A
Technical Abstract: To study the mechanism of resistance to sudden death syndrome (SDS), three partially resistant PIs (567.374, 520.733, and 567.650B) and two susceptible soybean cultivars (Pioneer Brand 9363 and Great Lakes 3302) were analyzed through reciprocal grafting. Non-grafted, self-grafted, and reciprocal grafted soybean seedlings were screened using aeroponic chambers and culture filtrate. When inoculated in the aeroponic chambers and tested with the culture filtrate, the susceptible non-grafted and self-grafted cultivars had higher foliar disease severity than the three resistant non-grafted and self-grafted PIs. The susceptible cultivars had less disease when roots of 567.650B and 567.374 were grafted on P9363 and GL3302. Based on aeroponic chamber and culture filtrate experiments, 520.733 appears to have seedling resistance to SDS; however it may be due to vigorous seedling growth. PI 567.374 and 567.650B were resistant to the toxic culture filtrate of Fusarium solani f. sp. glycines, but not root infection.