Skip to main content
ARS Home » Southeast Area » Stoneville, Mississippi » Crop Genetics Research » Research » Publications at this Location » Publication #326745
Title: Population structure of Cercospora sojina collected from different soybean culitvars in Milan and Jackson Tennessee

Author
item SHRESTHA, SANDESH - University Of Tennessee
item COCHRAN, ALICIA - University Of Tennessee
item LAMOUR, KURT - University Of Tennessee
item Mengistu, Alemu
item KELLY, HEATHER - University Of Tennessee

Submitted to: Meeting Proceedings
Publication Type: Abstract Only
Publication Acceptance Date: 6/15/2016
Publication Date: N/A
Citation: N/A

Interpretive Summary:

Technical Abstract: Frogeye Leaf Spot (FLS) of soybean is caused by the fungal pathogen, Cercospora sojina Hara. FLS causes significant damage resulting in a yield loss of 4 to 6 Bu/Acre, mostly in the Southern U.S. Since its first report in South Carolina in 1924 it has caused significant damage resulting in a yield loss of 267 to 403 Kg/ha, mostly in the Southern U.S. Symptoms appear as small light brown circular spots surrounded by a darkish brown to reddish circle. Lesions range from 1-5 mm in diameter with older lesions having a white center. As the disease progresses, lesions merge together and leaves fall prematurely. Several methods including fungicide treatment, crop rotation and host resistance are used for controlling FLS. Generally, quinone outside inhibitor (QoI) fungicides are used in controlling FLS but resistant isolates to QoI fungicides have developed. There have been limited studies of genetic diversity of Cercospora sojina. Currently, we are exploring variation in field populations using genome-wide single nucleotide polymorphism (SNP) markers. Candidate SNP markers were identified through de novo whole genome sequencing of three isolates. In 2015, 474 isolates were collected from 8 soybean cultivars (fungicide treated and untreated) from two counties in Tennessee. SNP genotypes will be assayed using targeted sequencing and the population structure of C. sojina discussed.