SNP markers linked to leaf rust and grain mold resistance in sorghum

Title 
SNP markers linked to leaf rust and grain mold resistance in sorghum 
Publication Type 
Journal Article 
Authors 
Upadhyaya HD, Wang Y-H, Sharma R, Sharma S 
Year of Publication 
2013 
Volume 
32 
Journal 
Molecular Breeding 
Issue 
Pagination 
451 - 462 
Date Published 
8/2013 
ISSN 
1572-9788 
URL 
http://link.springer.com/article/10.1007/s11032-013-9883-3 
Keywords 
Association Mapping, Grain mold, Hin1, Lr1, marker-assisted selection, MAS, Mini core collection, Resistance genes, Rp1-D, Rust, Rxo1, Single nucleotide polymorphism, SNP, Sorghum 
DOI 
10.1007/s11032-013-9883-3 
Abstract 

Grain mold and rust are diseases that can significantly reduce sorghum grain yield. Breeding for resistance to these diseases is hindered by inefficient disease screening. A viable option to greatly improve breeding efficiency is to identify molecular markers or genes linked to the host resistance. In this study, we applied 14,739 single nucleotide polymorphism markers to the sorghum mini core of 242 accessions that had been evaluated for rust resistance in both greenhouse and field and for grain mold in the field for 2 years. Through association mapping we have identified two loci linked to grain mold resistance and five loci linked to rust resistance. Among the two loci linked to grain mold resistance, one contained a homolog of the maize nonhost resistance gene Rxo1. Two of rust-linked loci each contained the rust resistance gene homologous to the maize rust resistance gene Rp1-D which is the B locus (the A locus containing Pu was not linked in this study) and to the wheat rust resistance gene Lr1. The remaining loci contained genes important in other steps of the defense response, such as cyclophilins that mediate resistance response preceding hypersensitive response (HR) and Hin1 directly involved in producing HR. The results from this study will facilitate marker-assisted selection of host resistance to grain mold and rust in sorghum.

 
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