Genomic estimation of complex traits reveals ancient maize adaptation to temperate North America

Science. 2017 Aug 4;357(6350):512-515. doi: 10.1126/science.aam9425.


By 4000 years ago, people had introduced maize to the southwestern United States; full agriculture was established quickly in the lowland deserts but delayed in the temperate highlands for 2000 years. We test if the earliest upland maize was adapted for early flowering, a characteristic of modern temperate maize. We sequenced fifteen 1900-year-old maize cobs from Turkey Pen Shelter in the temperate Southwest. Indirectly validated genomic models predicted that Turkey Pen maize was marginally adapted with respect to flowering, as well as short, tillering, and segregating for yellow kernel color. Temperate adaptation drove modern population differentiation and was selected in situ from ancient standing variation. Validated prediction of polygenic traits improves our understanding of ancient phenotypes and the dynamics of environmental adaptation.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Acclimatization / genetics*
  • Cold Temperature
  • Flowers / genetics
  • Flowers / physiology
  • Genome, Plant
  • Genomics
  • Multifactorial Inheritance
  • North America
  • Phenotype
  • Zea mays / genetics*
  • Zea mays / physiology*