Abstract
Cultivated potato (Solanum tuberosum L.) is a highly heterozygous autotetraploid that presents challenges in genome analyses and breeding. Wild potato species serve as a resource for the introgression of important agronomic traits into cultivated potato. One key species is Solanum chacoense and the diploid, inbred clone M6, which is self-compatible and has desirable tuber market quality and disease resistance traits. Sequencing and assembly of the genome of the M6 clone of S.chacoense generated an assembly of 825767562bp in 8260 scaffolds with an N50 scaffold size of 713602bp. Pseudomolecule construction anchored 508Mb of the genome assembly into 12 chromosomes. Genome annotation yielded 49124 high-confidence gene models representing 37740 genes. Comparative analyses of the M6 genome with six other Solanaceae species revealed a core set of 158367 Solanaceae genes and 1897 genes unique to three potato species. Analysis of single nucleotide polymorphisms across the M6 genome revealed enhanced residual heterozygosity on chromosomes 4, 8 and 9 relative to the other chromosomes. Access to the M6 genome provides a resource for identification of key genes for important agronomic traits and aids in genome-enabled development of inbred diploid potatoes with the potential to accelerate potato breeding.
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