QTL mapping for resistance to Cercospora sojina in Essex Forrest soybean (Glycine max L.) lines

Frogeye leafspot (FLS), caused by Cercospora sojina, is observed as red-brown lesions on leaves that can coalesce and decrease the photosynthetic ability of soybeans. The average yield loss due to Leaf Spot estimated at approximately 40% in established fields, whereas 100% incidence was previously recorded. QoI inhibitor fungicides were considered an effective control method, but pathogen quickly evolved thrive post-application. This trait spread across North America. Therefore, genetic host resistance likely most method prevent disease. To achieve this goal, we aimed screen 91 recombinant inbred lines (RILs) ‘Essex’ × ‘Forrest’ under greenhouse conditions for FLS used single nucleotide polymorphism (SNP) markers identify associated quantitative loci (QTL). Two QTL mapped study. One reported Chr. 13 coincides with reported, 19 novel. Overall, study will help better understand underlying mechanisms soybean C. sojina well develop varieties using marker assisted selection.   Key words: loci, Spot, Essex Forrest, disease resistance, genotypic phenotypic traits.