Potato Population Genomics

Meng, Xiaoxi; Tuttle, Heather K; Shannon, Laura M.

doi:10.1007/13836_2022_103

Cited by 1 publication

(4 citation statements)

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“…However, group chilotanum also showed the highest expected heterozygosity suggesting that the level of heterozygosity cannot be explained by balancing selection alone. This is consistent with previous observations of high heterozygosity and high haplotype numbers in US potatoes ( Hardigan et al., 2017 ; Meng et al., 2022 ).…”

Section: Discussionsupporting

confidence: 93%

“…Unreduced gametes are necessary for heritable introgression. Contemporary breeders have made extensive use of such crosses to introduce novel traits ( Ortiz et al., 1994 ; Capo et al., 2002 ; Zimnoch-Guzowska and Flis, 2021 ; Clot et al., 2023 , 2024 ) and it seems likely that this sort of introgression has been a tool used by humans throughout potato’s history ( Hoopes et al., 2022 ; Meng et al., 2022 ).…”

Section: Discussionmentioning

confidence: 99%

“…S. chilotanum in the US and Europe is characterized by extensive introgression from wild species ( Hardigan et al., 2017 ; Hoopes et al., 2022 ). While some of this introgression is the result of post 1945 introgression breeding for disease resistance ( Vos et al., 2015 ) much of it is older ( Hoopes et al., 2022 ; Meng et al., 2022 ). We observed evidence of introgression into US and European group chilotanum from group andigenum ( Figure 6 ).…”

Section: Discussionmentioning

confidence: 99%

“…Taxonomy within section petota is made difficult by morphological similarity, phenotypic plasticity, allele loss, a mixture of sexual and asexual reproduction, recent species divergence, polyploidy, introgression, and multiple hybrid origin ( Spooner and van den Berg, 1992 ; Spooner, 2009 ; Ames and Spooner, 2010 ; Cai et al., 2012 ; Huang et al, 2019 ; Zhou et al., 2020 ). There is extensive evidence for both hybridization in wild species ( Hawkes, 1969 ; Ugent, 1970 ; Hawkes, 1990 ; Spooner et al., 2007 ; Tang et al., 2022 ) and for wild species introgression into cultivated US and European potato continually since domestication ( Hardigan et al., 2017 ; Hoopes et al., 2022 ; Meng et al., 2022 ). The genebank collection provides the opportunity to investigate the extent to which the landraces exhibit the same history of admixture as wild and US/European improved potatoes.…”

Section: Introductionmentioning

confidence: 99%

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Potato soup: analysis of cultivated potato gene bank populations reveals high diversity and little structure

Tuttle,

Del Rio,

Bamberg

et al. 2024

Front. Plant Sci.

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Cultivated potatoes are incredibly diverse, ranging from diploid to pentaploid and encompass four different species. They are adapted to disparate environments and conditions and carry unique alleles for resistance to pests and pathogens. Describing how diversity is partitioned within and among these populations is essential to understanding the potato genome and effectively utilizing landraces in breeding. This task is complicated by the difficulty of making comparisons across cytotypes and extensive admixture within section petota. We genotyped 730 accessions from the US Potato genebank including wild diploids and cultivated diploids and tetraploids using Genotype-by-sequencing. This data set allowed us to interrogate population structure and diversity as well as generate core subsets which will support breeders in efficiently screening genebank material for biotic and abiotic stress resistance alleles. We found that even controlling for ploidy, tetraploid material exhibited higher observed and expected heterozygosity than diploid accessions. In particular group chilotanum material was the most heterozygous and the only taxa not to exhibit any inbreeding. This may in part be because group chilotanum has a history of introgression not just from wild species, but landraces as well. All group chilotanum, exhibits introgression from group andigenum except clones from Southern South America near its origin, where the two groups are not highly differentiated. Moving north, we do not observe evidence for the same level of admixture back into group andigenum. This suggests that extensive history of admixture is a particular characteristic of chilotanum.

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Section: Discussionsupporting

confidence: 93%