Abstract: Phytophthora root and stem rot is one of the most aggressive diseases
in soybean crop. The use of resistant cultivars is the main strategy to
reduce losses caused by the pathogen. This study aims to identify SNP markers
associated with genes or QTLs that provide soybean with partial resistance
to Phytophthora sojae. A total of 169 soybean cultivars were inoculated with
Phytophthora sojae and genotyped with 3,807 SNP markers. Genome-wide association
analysis was carried out via multiple linear models, followed by multiple
linear regression and linkage disequilibrium analysis. Four QTLs associated with
the characteristic were identified: two on chromosome 3 and two on chromosome
15. The regions containing these QTLs contain genes already annotated
as providers of resistance to pathogens, in plants. The use of those markers in
the selection of resistant plants can increase the efficiency of breeding programs
in the development of soybean varieties resistant to P. sojae.

Get the article here. (PDF)