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Genome-Wide Association Mapping of Anthracnose (Colletotrichum sublineolum) Resistance in the U.S. Sorghum Association Panel

Journal Article · · The Plant Genome
 [1];  [2];  [3];  [4];  [4]
  1. US Dept. of Agriculture (USDA)-Agricultural Research Service (ARS), Mayaguez, Puerto Rico (United States); USDA-ARS Mayaguez
  2. US Dept. of Agriculture (USDA)-Agricultural Research Service (ARS), College Station, TX (United States)
  3. Clemson Univ., Clemson, SC (United States)
  4. US Dept. of Agriculture (USDA)-Agricultural Research Service (ARS), Tifton, GA (United States)
The productivity and profitability of sorghum [Sorghum bicolor (L.) Moench] is reduced by susceptibility to fungal diseases, such as anthracnose (Colletotrichum sublineolum P. Henn.). A limited number of resistant accessions are present in the temperate-adapted germplasm; other exotic sources of resistance are not currently available for breeding programs. Among 335 accessions available to breeders from a previously genotyped sorghum association panel (SAP), we found that 75 were resistant to anthracnose. A phylogenetic analysis of these accessions showed high genetic diversity and multiple resistance sources. Genome-wide association scans (GWAS) were conducted using 268,289 single-nucleotide polymorphisms to identify loci associated with anthracnose resistance. Using logistic regressions for binary measures of resistance responses, we identified three loci within a region on chromosome 5 that have been previously associated with three sources of anthracnose resistance. A GWAS limited to Caudatum germplasm identified an association with a region on chromosome 1 and with the same previous region on chromosome 5. Candidate genes within these loci were related to R-gene families, signaling cascades, and transcriptional reprogramming, suggesting that the resistance response is controlled by multiple defense mechanisms. The strategic integration of exotic resistant germplasm into the SAP is needed to identify additional rare resistance alleles via GWAS.
Research Organization:
US Dept. of Agriculture (USDA)-Agricultural Research Service (ARS), Mayaguez, Puerto Rico (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER) (SC-23)
Grant/Contract Number:
SC0014171
OSTI ID:
1593798
Report Number(s):
USDA-ARS-CRIS--6090-21000-053-00-D
Journal Information:
The Plant Genome, Journal Name: The Plant Genome Journal Issue: 2 Vol. 11; ISSN 1940-3372
Publisher:
Alliance of Crop, Soil, and Environmental Science SocietiesCopyright Statement
Country of Publication:
United States
Language:
English

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Genome-Wide Association Mapping of Anthracnose ( Colletotrichum sublineolum ) Resistance in NPGS Ethiopian Sorghum Germplasm journal September 2019
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