TPS Fellow Stephanie Karhoff publishes in Crop Science

March 18, 2019
Stephanie in Greenhouse

In this study, "Characterization of a QTL against Phytophthora sojae in soybean", we characterized a potential source of resistance to Phytophthora sojae in order to facilitate its use in soybean breeding programs. Our objectives were to determine its isolate-specificity and measure its effect on yield and resistance to both P. sojae and other soybean pathogens. It increased resistance to P. sojae by 11-20% and 35-40%, respectively, based on laboratory and greenhouse assays and increased yield by 13-29% under disease conditions. We also found it was effective against seven P. sojae isolates with no isolate-specificity detected. No pleiotropic effects for resistance to either soybean cyst nematode or Fusarium graminearum were detected. This information improves soybean breeders’ ability to make informed decisions regarding the deployment of this resistance source in their respective breeding programs.


Resistant parent PI 427105B (left) and susceptible parent OX20-8 (right) following inoculation with Phytophthora sojae isolate 1.S.S.1.