High-precision chronology for Central American maize diversification from El Gigante rockshelter, Honduras
- Permanent Link:
- High-precision chronology for Central American maize diversification from El Gigante rockshelter, Honduras
- Series Title:
- Kennett, Douglas J.
Thakar, Heather B.
VanDerwarker, Amber M.
Webster, David L.
Culleton, Brendan J. et al
- Publication Date:
- Subjects / Keywords:
- Maize ( local )
Teosinte ( local )
Central America ( local )
Domestication ( local )
Agriculture ( local )
- serial ( sobekcm )
- The first steps toward maize (Zea mays subspecies mays) domestication occurred in the Balsas region of Mexico by âˆ¼9,000 calendar years B.P. (cal B.P.), but it remains unclear when maize was productive enough to be a staple grain in the Americas. Molecular and microbotanical data provide a partial picture of the timing and nature of morphological change, with genetic data indicating that alleles for some domestication traits were not yet fixed by 5,300 cal B.P. in the highlands of Mexico. Here, we report 88 radiocarbon dates on the botanical remains from El Gigante rockshelter (Honduras) to establish a Bayesian chronology over the past âˆ¼11,000 y spanning the transition to maize-based food production. Botanical remains are remarkably well preserved and include over 10,000 maize macrofossils. We directly dated 37 maize cobs to establish the appearance and local change of maize at the site. Cobs are common in deposits dating between 4,340 and 4,020 cal B.P., and again between 2,350 and 980 cal B.P. The earliest cobs appear robustly domesticated, having 10â€“14 rows, suggesting strong selection for increased yield. The later cobs are comparable to these earliest ones, but show clear emergence of diverse traits, including increased cob width, rachis segment length, and cupule width. Our results indicate that domesticated landraces of maize productive enough to be a staple grain existed in Central America by 4,300 cal B.P.
- Original Version:
- PNAS, Vol. 114, no. 34 (2017-08-07).
- Source Institution:
- University of South Florida Library
- Holding Location:
- University of South Florida
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- This object is protected by copyright, and is made available here for research and educational purposes. Permission to reuse, publish, or reproduce the object beyond the bounds of Fair Use or other exemptions to copyright law must be obtained from the copyright holder.
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