Abstract
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 Frogeye Leaf Spot is estimated at approximately 40% in established fields, whereas 100% incidence was previously recorded. QoI inhibitor fungicides were considered an effective control method, but the pathogen quickly evolved an ability to thrive post-application. This trait quickly spread across North America. Therefore, genetic host resistance is likely the most effective method to prevent the disease. To achieve this goal, we aimed to screen 91 recombinant inbred lines (RILs) of ‘Essex’ × ‘Forrest’ under greenhouse conditions for FLS resistance and used single nucleotide polymorphism (SNP) markers to identify associated quantitative trait loci (QTL). Two QTL were mapped in this study. One QTL reported on Chr. 13 coincides with the QTL previously reported, and the QTL on Chr. 19 was novel. Overall, this study will help to better understand the underlying mechanisms of soybean resistance to C. sojina as well as to develop soybean varieties with resistance to FLS using marker assisted selection. Key words: Cercospora sojina, quantitative trait loci, Frogeye Leaf Spot, Essex × Forrest, disease resistance, genotypic and phenotypic traits.
Highlights
Frogeye leaf spot (FLS), caused by the pathogen Cercospora sojina, is a foliar disease indicated by watersoaked lesions on the leaves of soybeans
The objectives of this study are to analyze the phenotypic variation of FLS resistance in E×F in a greenhouse setting, create a genetic linkage map for the population, and identify candidate quantitative trait loci (QTL) that code for resistance to C. sojina race 15 using single nucleotide polymorphism (SNP)
A single QTL associated with FLS resistance was identified on Chr. 13 at the ss715614578–ss715615158 interval, which coincides with the region of SNP41647 that is known for Rcs (PI594891) in linkage group F (Pham et al, 2015)
Summary
Frogeye leaf spot (FLS), caused by the pathogen Cercospora sojina, is a foliar disease indicated by watersoaked lesions on the leaves of soybeans. The lesions begin as small brown spots and develop a dark, redbrown border, whereas in severe cases, they can form on the stems, pods, and seeds. Soybean losses to FLS in the United States have been measured at 106.3 thousand metric tons, with the most losses in the southern states (Wrather et al, 2001). FLS can reduce soybean yield by 40% in conducive environmental conditions (Byamukama et al, 2019). Together, these characteristics create a cycle of reduced yield and reduced profits for infected fields
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