SDS resistance can be classified into foliar resistance to phytotoxins and root resistance to pathogen infection. In our preliminary resistance screen with Dr. Glen Hartman in the University of Illinois, we discovered a soybean differential system that distinguish SDS foliar symptoms into four categories. The discovery implement the resistance of foliar chlorosis and foliar necrosis may be controlled by different genetic loci. In collaboration with Dr. Hartman and Dr. Dechun Wang, we are making crossing between the differential lines and linkage mapping will be applied to understand the genetics of SDS foliar symptoms.
Our risk prediction study found evidence that the SDS pathogen and SCN may act together to make SDS foliar symptoms worse. We are using fluorescent microscopes to determine if these two organisms interact in the absence of soybeans.