Navigation Links
New research reveals the earliest evidence for corn in the New World
Date:3/23/2009

Among the hundreds of plants that have been domesticated in the New World, none has received as much attention or been subject to as much debate as corn, or maize (Zea mays L.), arguably the most important crop of the Americas. Controversies have existed for years over what the wild ancestor of maize is and where and when it was domesticated.

An international team of scientists led by Dolores Piperno, archaeobotanist at the Smithsonian's National Museum of Natural History, and Anthony Ranere, professor of anthropology at Temple University in Philadelphia, have discovered the first direct evidence that indicates maize was domesticated by 8,700 years ago, the earliest date recorded for the crop. The research findings will be published March 23 in the journal, Proceedings of the National Academy of Sciences.

It is certain that maize was originally domesticated in Mexico from a wild plant called "teosinte," and genetic studies of modern populations of teosinte and maize suggested this event occurred somewhere in the Central Balsas Valley region of tropical southwest Mexico. However, no research on early prehistoric human settlement and agriculture had been carried out there. Piperno and the team searched this region of Mexico for locations that showed human occupancy for the time period they thought to be critical to maize domestication, from approximately 8,000 to 9,000 years ago. They discovered sites dating to this age, excavated them and analyzed the stone tools and plant remains they retrieved. Microfossil (starch grain and phytolith) analysis from a rock shelter called Xihuatoxtla, conducted in part with Irene Holst at the Smithsonian Tropical Research provide direct evidence for the domestication of maize and a species of squash.

"Our findings confirm an early Holocene age for maize domestication and indicate that it is another important New World crop that had its origins in the tropical forest," said Piperno. "Much more work needs to be done in the Central Balsas region to investigate even earlier periods when teosinte must have been exploited by early human populations and then initially cultivated."

The evidence corroborates a large quantity of previous research carried out in the lowland tropical forest south of Mexico by Piperno and other investigators that indicated maize spread to Panama approximately 7,600 years ago and was well established in northern South America about 6,000 years ago.

The archaeological record establishes tropical southwest Mexico as an important region where early agriculture occurred in the New World and adds maize to the roster of important cereals (others are wheat and barley from the Middle East) that were cultivated and domesticated by 9,000 years ago. The team's findings also contribute to the growing body of evidence that seasonally dry tropical forests were important centers of early human settlement and farming in the Neotropics. Early agriculture in this region of Mexico appears to have involved small groups of cultivators who were shifting their settlements seasonally and engaging in a variety of subsistence pursuits.


'/>"/>

Contact: Michele Urie
uriem@si.edu
202-633-2950
Smithsonian
Source:Eurekalert

Related biology news :

1. Researchers find the earliest evidence of domesticated maize
2. Research links evolution of fins and limbs with that of gills
3. Rensselaer receives more than $2 million from New York State to fund stem cell research
4. Review of probiotic trial research finds only Bifantis able to claim efficacy for IBS symptoms
5. Innerscope Research(R) Appoints Digital Leader, Andre Marquis, as Senior Vice President of Sales and Marketing
6. Innerscope Research(R) Uses Same-Day Results From Biometric Study to Identify Key Themes, Styles Behind Effective, Engaging Speaker Presentations
7. NIH funds research center for womens reproductive health at Einstein
8. Research to secure a safe water supply
9. Research synthesis shines light on several management options after fires in diverse ecosystems
10. Lombardi research: Monoclonal antibodies primed to become potent immune weapons against cancer
11. UK researcher identifies just 8 patterns as the cause of all humor
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:3/27/2017)... ROCKVILLE CENTRE, N.Y. , March 27, 2017 ... by Healthcare Information and Management Systems Society (HIMSS) ... Analytics Outpatient EMR Adoption Model sm . In ... top 12% of U.S. hospitals using an electronic ... recognized CHS for its high level of EMR ...
(Date:3/24/2017)... DUBLIN , Mar 24, 2017 Research ... Vehicle Access System Market Analysis & Trends - Industry Forecast to ... ... poised to grow at a CAGR of around 15.1% over the ... This industry report analyzes the market estimates and forecasts for ...
(Date:3/23/2017)... , Mar. 23, 2017 Research and ... System Market Analysis & Trends - Industry Forecast to 2025" ... ... grow at a CAGR of around 8.8% over the next decade ... industry report analyzes the market estimates and forecasts for all the ...
Breaking Biology News(10 mins):
(Date:10/10/2017)... ... 2017 , ... Dr. Bob Harman, founder and CEO of VetStem Biopharma, ... The event entitled “Stem Cells and Their Regenerative Powers,” was held on ... DVM, MPVM was joined by two human doctors: Peter B. Hanson, M.D., Chief of ...
(Date:10/10/2017)... ... 2017 , ... The Pittcon Program Committee is pleased to ... who have made outstanding contributions to analytical chemistry and applied spectroscopy. Each award ... conference and exposition for laboratory science, which will be held February 26-March 1, ...
(Date:10/9/2017)... ... 2017 , ... The Giving Tree Wellness Center announces the ... of consumers who are incorporating medical marijuana into their wellness and health regimens. ... operators of two successful Valley dispensaries, The Giving Tree’s two founders, Lilach Mazor ...
(Date:10/7/2017)...  The 2017 Nobel Prize in Chemistry recognizes ... Joachim Frank and Richard Henderson ... (cryo-EM) have helped to broaden the use ... The winners worked with systems manufactured by Thermo ... resolved, three-dimensional images of protein structures that lead ...
Breaking Biology Technology: