Potato is a remarkable plant—it is the third most important crop worldwide and the most important non-seed crop,and it is successfully cultivated in a wide array of environments and geographical areas.But where did i...Potato is a remarkable plant—it is the third most important crop worldwide and the most important non-seed crop,and it is successfully cultivated in a wide array of environments and geographical areas.But where did it come from,and how is it such a success?The evolutionary relationships within the Petota lineage(diploid and polyploid tuber-bearing species)of the genus Solanum are challenging and have often been conflicted among different studies(Hawkes,1990;Spooner et al.,2007).The exact relationship of Petota with the closely related non-tuberizing diploids in the Tomato lineage(tomato species)and species in the Etuberosum lineage has also been difficult to pinpoint.Previous studies mainly relied on morphological characters or a few DNA fragments,but frequent interspecies hybridization and polyploidization in Petota complicate the matter.However,vast and diverse genome data now provide new insights into the origin of the common ancestor of all species within the Petota lineage.展开更多
Wild potato species have substantial phenotypic and physiological diversity. Here, we report a comprehen- sive assessment of wild and cultivated potato species based on genomic analyses of 201 accessions of Solanum se...Wild potato species have substantial phenotypic and physiological diversity. Here, we report a comprehen- sive assessment of wild and cultivated potato species based on genomic analyses of 201 accessions of Solanum section Petota. We sequenced the genomes of these 201 accessions and identified 6 487 006 high-quality single nucleotide polymorphisms （SNPs） from 167 accessions in clade 4 of Solanum section Petota, including 146 wild and 21 cultivated diploid potato accessions with a broad geographic distribution. Genome-wide genetic variation analysis showed that the diversity of wild potatoes is higher than that of cultivated potatoes, and much higher genetic diversity in the agronomically important disease resistance genes was observed in wild potatoes. Furthermore, by exploiting information about known quantitative trait loci （QTL）, we identified 609 genes under selection, including those correlated with the loss of bitterness in tubers and those involved in tuberization, two major domesticated traits of potato. Phylogenetic analyses revealed a north-south division of all species in clade 4, not just those in the S. brevicaule complex, and further supported So candolleanum as the progenitor of cultivated potato and the monophyletic origin of cultivated potato in southern Peru. In addition, we analyzed the genome of S. candolleanum and identified 529 genes lost in cultivated potato. Collectively, the molecular markers generated in this study provide a valuable resource for the identification of agronomicaUy important genes useful for potato breeding.展开更多
文摘Potato is a remarkable plant—it is the third most important crop worldwide and the most important non-seed crop,and it is successfully cultivated in a wide array of environments and geographical areas.But where did it come from,and how is it such a success?The evolutionary relationships within the Petota lineage(diploid and polyploid tuber-bearing species)of the genus Solanum are challenging and have often been conflicted among different studies(Hawkes,1990;Spooner et al.,2007).The exact relationship of Petota with the closely related non-tuberizing diploids in the Tomato lineage(tomato species)and species in the Etuberosum lineage has also been difficult to pinpoint.Previous studies mainly relied on morphological characters or a few DNA fragments,but frequent interspecies hybridization and polyploidization in Petota complicate the matter.However,vast and diverse genome data now provide new insights into the origin of the common ancestor of all species within the Petota lineage.
文摘Wild potato species have substantial phenotypic and physiological diversity. Here, we report a comprehen- sive assessment of wild and cultivated potato species based on genomic analyses of 201 accessions of Solanum section Petota. We sequenced the genomes of these 201 accessions and identified 6 487 006 high-quality single nucleotide polymorphisms （SNPs） from 167 accessions in clade 4 of Solanum section Petota, including 146 wild and 21 cultivated diploid potato accessions with a broad geographic distribution. Genome-wide genetic variation analysis showed that the diversity of wild potatoes is higher than that of cultivated potatoes, and much higher genetic diversity in the agronomically important disease resistance genes was observed in wild potatoes. Furthermore, by exploiting information about known quantitative trait loci （QTL）, we identified 609 genes under selection, including those correlated with the loss of bitterness in tubers and those involved in tuberization, two major domesticated traits of potato. Phylogenetic analyses revealed a north-south division of all species in clade 4, not just those in the S. brevicaule complex, and further supported So candolleanum as the progenitor of cultivated potato and the monophyletic origin of cultivated potato in southern Peru. In addition, we analyzed the genome of S. candolleanum and identified 529 genes lost in cultivated potato. Collectively, the molecular markers generated in this study provide a valuable resource for the identification of agronomicaUy important genes useful for potato breeding.
