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Title: Natural Allelic Variations in Highly Polyploidy Saccharum Complex

Journal Article · · Frontiers in Plant Science
 [1];  [2];  [3];  [3];  [4];  [5];  [6];  [7]
  1. Univ. of Florida, Gainesville, FL (United States); Dezhou Univ., Dezhou (China)
  2. Univ. of Florida, Gainesville, FL (United States)
  3. RAPiD Genomics LLC, Gainesville, FL (United States)
  4. United States Dept. of Agriculture-Agricultural Research Service, Houma, LA (United States); United States Dept. of Agriculture-Agricultural Research Service, Canal Point, FL (United States)
  5. Fujian Agriculture and Forestry Univ., Fuzhou (China)
  6. United States Dept. of Agriculture-Agricultural Research Service, Canal Point, FL (United States)
  7. Univ. of Florida, Gainesville, FL (United States); Fujian Agriculture and Forestry Univ., Fuzhou (China)

Sugarcane (Saccharum spp.) is an important sugar and biofuel crop with high polyploid and complex genomes. The Saccharum complex, comprised of Saccharum genus and a few related genera, are important genetic resources for sugarcane breeding. A large amount of natural variation exists within the Saccharum complex. Though understanding their allelic variation has been challenging, it is critical to dissect allelic structure and to identify the alleles controlling important traits in sugarcane. To characterize natural variations in Saccharum complex, a target enrichment sequencing approach was used to assay 12 representative germplasm accessions. In total, 55,946 highly efficient probes were designed based on the sorghum genome and sugarcane unigene set targeting a total of 6 Mb of the sugarcane genome. A pipeline specifically tailored for polyploid sequence variants and genotype calling was established. BWAmem and sorghum genome approved to be an acceptable aligner and reference for sugarcane target enrichment sequence analysis, respectively. Genetic variations including 1,166,066 non-redundant SNPs, 150,421 InDels, 919 gene copy number variations, and 1,257 gene presence/absence variations were detected. SNPs from three different callers (Samtools, Freebayes, and GATK) were compared and the validation rates were nearly 90%. Based on the SNP loci of each accession and their ploidy levels, 999,258 single dosage SNPs were identified and most loci were estimated as largely homozygotes. An average of 34,397 haplotype blocks for each accession was inferred. The highest divergence time among the Saccharum spp. was estimated as 1.2 million years ago (MYA). Saccharum spp. diverged from Erianthus and Sorghum approximately 5 and 6 MYA, respectively. Furthermore, the target enrichment sequencing approach provided an effective way to discover and catalog natural allelic variation in highly polyploid or heterozygous genomes.

Research Organization:
Univ. of Florida, Gainesville, FL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER)
OSTI ID:
1379186
Journal Information:
Frontiers in Plant Science, Vol. 7; ISSN 1664-462X
Publisher:
Frontiers Research FoundationCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 28 works
Citation information provided by
Web of Science

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Cited By (7)

Target enrichment sequencing of 307 germplasm accessions identified ancestry of ancient and modern hybrids and signatures of adaptation and selection in sugarcane ( Saccharum spp.), a ‘sweet’ crop with ‘bitter’ genomes journal August 2018
Metabolite Profiles of Sugarcane Culm Reveal the Relationship Among Metabolism and Axillary Bud Outgrowth in Genetically Related Sugarcane Commercial Cultivars journal June 2018
Development and Applications of a High Throughput Genotyping Tool for Polyploid Crops: Single Nucleotide Polymorphism (SNP) Array journal February 2018
From Genomes to GENE-omes: Exome Sequencing Concept and Applications in Crop Improvement journal December 2017
On the accuracy of genomic prediction models considering multi-trait and allele dosage in Urochloa spp. interspecific tetraploid hybrids journal June 2019
Genetic Structure Analysis in Sugarcane (Saccharum spp.) Using Target Region Amplification Polymorphism (TRAP) Markers Based on Sugar- and Lignin-Related Genes and Potential Application in Core Collection Development journal January 2020
High-throughput targeted genotyping using next-generation sequencing applied in Coffea canephora breeding journal February 2018