Screening Soybeans for Disease Resistance

We inoculate plants with the particular Phytophthora sojae race in the greenhouse. The respective disease reaction will be recorded seven days later. Standard soybean varieties with known reactions to selected races are included in the test. The exact races to be used will be determined with the client – depending on the Rps genes thought to be present. We get consistent results with races 1,7, 4, 20 and 25. Four replications with tens plants per variety are sown and inoculated for each race. The final report will include a summary indicating the type of resistance indicated by these tests (i.e., Rps 1c, 1k, 3 or 8 present) and whether segregation may still be occurring.