Identification of genetic markers linked to anthracnose resistance in sorghum using association analysis

Title 
Identification of genetic markers linked to anthracnose resistance in sorghum using association analysis 
Publication Type 
Journal Article 
Authors 
Upadhyaya HD, Wang Y-H, Sharma R, Sharma S 
Year of Publication 
2013 
Volume 
126 
Journal 
Theoretical and Applied Genetics 
Issue 
Pagination 
1649 - 1657 
Date Published 
6/2013 
ISSN 
1432-2242 
URL 
http://link.springer.com/article/10.1007/s00122-013-2081-1 
Keywords 
Anthracnose, association analysis, Colletotrichum sublineolum, Hin1, MNR, NB-ARC, Pib, SNP markers, Sorghum 
DOI 
10.1007/s00122-013-2081-1 
Abstract 

Anthracnose in sorghum caused by Colletotrichum sublineolum is one of the most destructive diseases affecting sorghum production under warm and humid conditions. Markers and genes linked to resistance to the disease are important for plant breeding. Using 14,739 SNP markers, we have mapped eight loci linked to resistance in sorghum through association analysis of a sorghum mini-core collection consisting of 242 diverse accessions evaluated for anthracnose resistance for 2 years in the field. The mini-core was representative of the International Crops Research Institute for the Semi-Arid Tropics’ world-wide sorghum landrace collection. Eight marker loci were associated with anthracnose resistance in both years. Except locus 8, disease resistance-related genes were found in all loci based on their physical distance from linked SNP markers. These include two NB-ARC class of R genes on chromosome 10 that were partially homologous to the rice blast resistance gene Pib, two hypersensitive response-related genes: autophagy-related protein 3 on chromosome 1 and 4 harpin-induced 1 (Hin1) homologs on chromosome 8, a RAV transcription factor that is also part of R gene pathway, an oxysterol-binding protein that functions in the non-specific host resistance, and homologs of menthone:neomenthol reductase (MNR) that catalyzes a menthone reduction to produce the antimicrobial neomenthol. These genes and markers may be developed into molecular tools for genetic improvement of anthracnose resistance in sorghum.

 
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