Submitted to: Phytopathology
Publication Type: Abstract Only
Publication Acceptance Date: 3/10/2004
Publication Date: 8/2/2004
Citation: Vuong, T.D., Hartman, G.L. 2004. Genetic analysis and qtl identification of soybean resistance to sclerotinia stem rot. Phytopathology; 2004.
Technical Abstract: Sclerotinia stem rot (Sclerotinia sclerotiorum) is a major disease of soybean in the north-central states of the US. Partial resistance to this pathogen has been reported; yet there is limited understanding of inheritance of the resistance. The objectives were to determine the genetics of the resistance and identify molecular markers associated with the resistance. Six crosses were made among susceptible and partially resistant soybean genotypes. Segregating F2 and F3 populations were used for genetic analysis indicating that resistance to S. sclerotiorum was quantitatively inherited. Simple sequence repeat (SSR) assay was utilized for the identification of markers and analysis of QTL in F4:5 recombinant inbred lines. Of over 500 SSR primers screened, 51% showed polymorphisms. SSR marker analysis will provide the basis to screen segregating populations for QTL resistance genes.