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

AI Article Synopsis

  • * A study of 335 sorghum accessions found 75 that were resistant to anthracnose, revealing significant genetic diversity and multiple potential sources of resistance.
  • * Genome-wide association scans identified key genetic loci linked to anthracnose resistance, suggesting that resistance involves various defense mechanisms and emphasizing the need to integrate exotic resistant germplasm for further exploration.

Article Abstract

The productivity and profitability of sorghum [ (L.) Moench] is reduced by susceptibility to fungal diseases, such as anthracnose ( 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.

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Source
http://dx.doi.org/10.3835/plantgenome2017.11.0099DOI Listing

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