Identification of Marker-Trait Associations for Resistance to Phytophthora Root Resistance in a Genetic Diversity Panel Derived from Modern Chinese and Canadian Germplasm

Lead Applicant: Istvan Rajcan

Research Priority: Innovative Products & Product Improvement

Program Type: Tier 1

Funding Cycle: 2026/2027

Research Centre: N/A

Research Summary: The soil-borne soybean pathogen Phytophthora sojae has been found in every region that produces soybeans. It decreases yield by causing root rot, wilting and stem lesions. These symptoms characterize the disease Phytophthora root rot (PRR). The soybean industry relies on use of varieties with resistant genes (Rps) to manage losses, based on the pathotype of with RPS based on the pathotype (sub-type) of P. Sojae. New resistance genes must be employed every 6 to 15 years, as the pathogen will evolve to overcome the current resistance mechanisms. New sources of resistance are needed as the currently employed Rps1c and Rps1k are ineffective. Chinese genetic material (germplasm) may hold undiscovered resistance genes for PRR resistance as the germplasm is increasingly diverse. Identifying marker-trait associations (genetic markers linked to resistance) in a panel of Chinese and Canadian germplasm will allow for a comprehensive evaluation of exotic germplasm while re-evaluating current cultivars for PRR resistance.