Development and analysis of a 20K SNP array for potato (Solanum tuberosum): an insight into the breeding history.
A 20K SNP array was developed and a comprehensive set of tetraploid cultivar was genotyped. This allowed us to identify footprints of the breeding history in contemporary breeding material such as identification of introgression segments, selection and founder signatures. A non-redundant subset of 15,138 previously identified SNPs and 4454 SNPs originating from the SolCAP project were combined into a 20k Infinium SNP array for genotyping a total of 569 potato genotypes. In this study we describe how this SNP array (encoded SolSTW array) was designed and analysed with fitTetra, software designed for autotetraploids. Genotypes from different countries and market segments, complemented with historic cultivars and important progenitors, were genotyped. This comprehensive set of genotypes combined with the deliberate inclusion of a large proportion of SNPs with a low minor allele frequency allowed us to distinguish genetic variation contributed by introgression breeding. This "new" (post 1945) genetic variation is located on specific chromosomal regions and enables the identification of SNP markers linked to R-genes. In addition, when the genetic composition of modern cultivars was compared with cultivars released before 1945, it appears that 96% of the genetic variants present in those ancestral cultivars remains polymorphic in modern cultivars. Hence, genetic erosion is almost absent in potato. Finally, we studied population genetic processes shaping the genetic composition of the modern European potato including drift, selection and founder effects. This resulted in the identification of major founders contributing to contemporary germplasm.
Wageningen UR, Plant Breeding, P.O. Box 386, 6700 AJ, Wageningen, The Netherlands.
Peter G
PG
Vos
Wageningen UR, Plant Breeding, P.O. Box 386, 6700 AJ, Wageningen, The Netherlands.
Jan G A M L
JG
Uitdewilligen
Wageningen UR, Plant Breeding, P.O. Box 386, 6700 AJ, Wageningen, The Netherlands.
Roeland E
RE
Voorrips
Wageningen UR, Plant Breeding, P.O. Box 386, 6700 AJ, Wageningen, The Netherlands.|Centre for BioSystems Genomics, P.O. Box 98, 6700 AB, Wageningen, The Netherlands.
Richard G F
RG
Visser
Wageningen UR, Plant Breeding, P.O. Box 386, 6700 AJ, Wageningen, The Netherlands. herman.vaneck@wur.nl.|Centre for BioSystems Genomics, P.O. Box 98, 6700 AB, Wageningen, The Netherlands. herman.vaneck@wur.nl.
Herman J
HJ
van Eck
D002874:Chromosome Mapping; D018744:DNA, Plant / Q000235:genetics; D005787:Gene Frequency; D005788:Gene Pool; D005819:Genetic Markers; D005828:Genetics, Population; D018745:Genome, Plant; D005838:Genotype; D020411:Oligonucleotide Array Sequence Analysis; D000069600:Plant Breeding; D020641:Polymorphism, Single Nucleotide; D011198:Solanum tuberosum / Q000235:genetics*
D018744:DNA, Plant; D005819:Genetic Markers