Journal
FRONTIERS IN PLANT SCIENCE
Volume 10, Issue -, Pages -Publisher
FRONTIERS MEDIA SA
DOI: 10.3389/fpls.2019.00139
Keywords
potato; landraces; genetic diversity; population structure; SSR; domestication
Categories
Funding
- National Natural Science Foundation of China [31460368]
- National Key R&D Program of China [2017YFD0101906]
- National Potato Industry Technology System [CARS-09-P03]
- Yunnan Natural Science Foundation [2015FD061, 2013FB091]
- Yunnan Technology Innovation Personnel Training Project [2015HB002, 2014HB060]
- Yunnan Potato Seed Industry Research and Demonstration International Sci-Tech Cooperation Base [2017IB040]
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China is the world's leading country for potato production but potato is not native to China. To gain insights into the genetic diversity of potato germplasm various studies have been performed but no study has been reported for potato landraces in China. To improve the available genepool for future potato breeding programs, a diverse population containing 292 genotypes (including foreign elite lines, local landraces and cultivars) was developed and genotyped using 30 SSR markers covering the entire potato genome. A total of 174 alleles were detected with an average of 5.5 alleles per locus. The model-based structure analysis discriminated the population into two main sub-groups, which can be further subdivided into seven groups based on collection sites. One sub-group (P1) revealed less genetic diversity than other (P2) and contained a higher number of commercial cultivars possibly indicating a slight reduction in diversity due to selection in breeding programs. The P2 sub-group showed a wider range of genetic diversity with more new and unique alleles attained from wild relatives. The potato landraces, clustered in sub-population P1 may be derived from historical population imported from ancient European and International Potato Center genotypes while sub-population P2 may be derived from modern populations from International Potato Center and European genotypes. It is proposed that in the first step, the potato genotypes were introduced from Europe to China, domesticated as landraces, and then hybridized for modern cultivars.
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