Disentangling the origins of cultivated sweet potato (Ipomoea batatas (L.) Lam.)

PLoS One. 2013 May 27;8(5):e62707. doi: 10.1371/journal.pone.0062707. Print 2013.

Abstract

Sweet potato (Ipomoea batatas (L.) Lam., Convolvulaceae) counts among the most widely cultivated staple crops worldwide, yet the origins of its domestication remain unclear. This hexaploid species could have had either an autopolyploid origin, from the diploid I. trifida, or an allopolyploid origin, involving genomes of I. trifida and I. triloba. We generated molecular genetic data for a broad sample of cultivated sweet potatoes and its diploid and polyploid wild relatives, for noncoding chloroplast and nuclear ITS sequences, and nuclear SSRs. Our data did not support an allopolyploid origin for I. batatas, nor any contribution of I. triloba in the genome of domesticated sweet potato. I. trifida and I. batatas are closely related although they do not share haplotypes. Our data support an autopolyploid origin of sweet potato from the ancestor it shares with I. trifida, which might be similar to currently observed tetraploid wild Ipomoea accessions. Two I. batatas chloroplast lineages were identified. They show more divergence with each other than either does with I. trifida. We thus propose that cultivated I. batatas have multiple origins, and evolved from at least two distinct autopolyploidization events in polymorphic wild populations of a single progenitor species. Secondary contact between sweet potatoes domesticated in Central America and in South America, from differentiated wild I. batatas populations, would have led to the introgression of chloroplast haplotypes of each lineage into nuclear backgrounds of the other, and to a reduced divergence between nuclear gene pools as compared with chloroplast haplotypes.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Base Sequence
  • Chloroplasts / genetics
  • Colombia
  • Crops, Agricultural / genetics
  • DNA, Plant / genetics
  • DNA, Ribosomal Spacer / genetics
  • Ecuador
  • Evolution, Molecular
  • Genes, Plant*
  • Genetic Speciation
  • Genetic Variation
  • Genome, Plant
  • Guatemala
  • Haplotypes
  • Ipomoea batatas / genetics*
  • Mexico
  • Microsatellite Repeats
  • Multilocus Sequence Typing
  • Phylogeny
  • Phylogeography
  • Plant Leaves / genetics
  • Polyploidy

Substances

  • DNA, Plant
  • DNA, Ribosomal Spacer

Grants and funding

This study was funded by grants from the “Pacific funds” distributed by the French Ministry of European and Foreign Affairs. C. Roullier was supported by a doctoral grant from the French Ministry of Higher Education and Research. A. Duputié was supported by an IOF grant within the European Commission's 7th Framework Programme (TRECC-2009-237228). The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.