Abstract
Key message
We have developed a SNP array for sunflower containing more than 25 K markers, representing single loci mostly in or near transcribed regions of the genome. The array was successfully applied to genotype a diversity panel of lines, hybrids, and mapping populations and represented well the genetic diversity of cultivated sunflower. Results of PCoA and population substructure analysis underlined the complexity of the genetic composition of current elite breeding material. The performance of this genotyping platform for genome-based prediction of phenotypes and detection of QTL with improved resolution could be demonstrated based on the re-evaluation of a population segregating for resistance to Sclerotinia midstalk rot. Given our results, the newly developed 25 K SNP array is expected to be of great utility for the most important applications in genome-based sunflower breeding and research.
Abstract
Genotyping with a large number of molecular markers is a prerequisite to conduct genome-based genetic analyses with high precision. Here, we report the design and performance of a 25 K SNP genotyping array for sunflower (Helianthus annuus L.). SNPs were discovered based on variant calling in de novo assembled, UniGene-based contigs of sunflower derived from whole genome sequencing and amplicon sequences originating from four and 48 inbred lines, respectively. After inclusion of publically available transcriptome-derived SNPs, in silico design of the Illumina® Infinium iSelect HD BeadChip yielded successful assays for 22,299 predominantly haplotype-specific SNPs. The array was validated in a sunflower diversity panel including inbred lines, open-pollinated varieties, introgression lines, landraces, recombinant inbred lines, and F2 populations. Validation provided 20,502 high-quality bi-allelic SNPs with stable cluster performance whereby each SNP marker represents a single locus mostly in or near transcribed regions of the sunflower genome. Analyses of population structure and quantitative resistance to Sclerotinia midstalk rot demonstrate that this array represents a significant improvement over currently available genomic tools for genetic diversity analyses, genome-wide marker-trait association studies, and genetic mapping in sunflower.
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Acknowledgments
This work has been supported by a grant (FKZ: 0315952A-D) from the German Federal Ministry for Education and Research (BMBF). We are grateful to USDA and INRA (Patrick Vincourt) for providing seeds of sunflower accessions used as core collection during this project. We thank Uwe Scholz and the Research group Bioinformatics and Information Technology at IPK Gatersleben for providing computational resources.
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The authors MWG, JP, AP and HL have competing commercial interests as members of TraitGenetics GmbH which is a company that offers marker development and analysis (including this array) for commercial purposes. The authors MO and SW have competing commercial interests as members of KWS SAAT SE which is a sunflower breeding company. This does not alter the authors’ adherence to sharing all data and materials. There are no further products in development or marketed products or patents to declare.
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Figure S1: Representative cluster plots obtained for the sunflower SNP array based on the GenomeStudio software. Genotypes are called for each sample (dot) by their signal intensity (y axis, Norm R) and allele frequency (x axis, Norm Theta) relative to canonical cluster positions for a given SNP (dark shading). Cluster ovals indicate the position of the allele calling areas. Data points are color coded according to their genotype call (homozygous allele A = red, homozygous allele B = blue, heterozygous AB = purple). Data points colored in black are classified as “no calls”. A) Calling of all three genotypes with clearly defined and separated clusters (polymorphic SNP); B) Calling of only one genotype in essentially all 1090 sunflower lines. Marker is considered as successful but monomorphic; C) Pattern showing ambiguous clustering with low signal intensity, considered as a failed SNP marker; D) Multiple clusters indicative of two simultaneously scored polymorphic loci. Such SNP markers cannot be scored accurately and were removed from further analysis (TIFF 2870 kb)
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Figure S2: Venn diagram of polymorphic SNPs among 184 inbred lines with known category assignment. Venn diagram showing the number of polymorphic variants represented on the 25 K array in 184 inbred lines with known category assignment. Numbers indicate the absolute number of SNP markers. Percentages refer to the proportion of class-specific polymorphic SNPs to the total number of 18,825 markers polymorphic for this set of genotypes (TIFF 3443 kb)
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Figure S3: Cross-validation errors from ADMIXTURE. Cross-validation errors as a function of the number of assumed groups K. Shown are standard error estimates from ADMIXTURE for K = 1 to 20 for 243 sunflower inbred lines based on 20,502 SNPs (TIFF 675 kb)
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Figure S4: Distribution and correlation of phenotypic traits. A) Histograms and B) correlation plots of adjusted means averaged over two locations for the 113 RILs. Shown are the data for stem lesion length, speed of fungal growth, leaf lesion length, and leaf length with petiole (TIFF 158 kb)
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Livaja, M., Unterseer, S., Erath, W. et al. Diversity analysis and genomic prediction of Sclerotinia resistance in sunflower using a new 25 K SNP genotyping array. Theor Appl Genet 129, 317–329 (2016). https://doi.org/10.1007/s00122-015-2629-3
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DOI: https://doi.org/10.1007/s00122-015-2629-3