Molecular Characterization of Resistance to Soybean Rust (Phakopsora pachyrhizi Syd. & Syd.) in Soybean Cultivar DT 2000 (PI 635999)

• Published in: PloS one 2016-12, Vol.11 (12), p.e0164493-e0164493
• Main Authors: Vuong, Tri D, Walker, David R, Nguyen, Binh T, Nguyen, Tuyet T, Dinh, Hoan X, Hyten, David L, Cregan, Perry B, Sleper, David A, Lee, Jeong D, Shannon, James G, Nguyen, Henry T
• Format: Article
• Language: English
• Subjects: Alleles; Biology and Life Sciences; Chromosome Mapping; Chromosomes, Plant - chemistry; Crop diseases; Cultivars; Disease Resistance - genetics; Genes; Genetic analysis; Genetic Loci; Genetic Markers - immunology; Genome, Plant; Genomes; Genomics; Genotype; Germplasm; Glycine max; Glycine max - genetics; Glycine max - immunology; Glycine max - microbiology; Glycine tomentella; Inbreeding; Laboratories; Loci; Marker-assisted selection; Markers; Microsatellite Repeats - immunology; Nucleotide sequence; People and Places; Phakopsora pachyrhizi; Phakopsora pachyrhizi - pathogenicity; Phakopsora pachyrhizi - physiology; Plant Diseases - genetics; Plant Diseases - immunology; Plant Diseases - microbiology; Plant sciences; Polymorphism; Polymorphism, Single Nucleotide; Research and Analysis Methods; Rust; Rust fungi; Single-nucleotide polymorphism; Soybeans; Spores, Fungal - pathogenicity; Spores, Fungal - physiology; Sporulation
• ISSN: 1932-6203; 1932-6203
• DOI: 10.1371/journal.pone.0164493

Resistance to soybean rust (SBR), caused by Phakopsora pachyrhizi Syd. & Syd., has been identified in many soybean germplasm accessions and is conferred by either dominant or recessive genes that have been mapped to six independent loci (Rpp1 -Rpp6), but No U.S. cultivars are resistant to SBR. The cultivar DT 2000 (PI 635999) has resistance to P. pachyrhizi isolates and field populations from the United States as well as Vietnam. A F6:7 recombinant inbred line (RIL) population derived from Williams 82 × DT 2000 was used to identify genomic regions associated with resistance to SBR in the field in Ha Noi, Vietnam, and in Quincy, Florida, in 2008. Bulked segregant analysis (BSA) was conducted using the soybean single nucleotide polymorphism (SNP) USLP 1.0 panel along with simple sequence repeat (SSR) markers to detect regions of the genome associated with resistance. BSA identified four BARC_SNP markers near the Rpp3 locus on chromosome (Chr.) 6. Genetic analysis identified an additional genomic region around the Rpp4 locus on Chr. 18 that was significantly associated with variation in the area under disease progress curve (AUDPC) values and sporulation in Vietnam. Molecular markers tightly linked to the DT 2000 resistance alleles on Chrs. 6 and 18 will be useful for marker-assisted selection and backcrossing in order to pyramid these genes with other available SBR resistance genes to develop new varieties with enhanced and durable resistance to SBR.