Featured Research

from universities, journals, and other organizations

Genetically Modified Maize Not Found In Southern Mexico

Date:
August 12, 2005
Source:
Ohio State University
Summary:
Contrary to what many scientists thought, genetically modified (GM) corn has not yet spread to native maize crops in southern Mexico. After analyzing tens of thousands of seeds from maize crops grown in 2003 and 2004, researchers from Mexico and the United States found no evidence of transgenes in these indigenous varieties.

Oaxaca , the southern Mexican state where Snow and her colleagues conducted their work.
Credit: Image courtesy of Ohio State University

COLUMBUS , Ohio – Contrary to what many scientists thought,genetically modified (GM) corn has not yet spread to native maize cropsin southern Mexico.

After analyzing tens of thousands of seedsfrom maize crops grown in 2003 and 2004, researchers from Mexico andthe United States found no evidence of transgenes in these indigenousvarieties.

The finding surprised the researchers, said AllisonSnow, a professor of evolution, ecology and organismal biology at OhioState University . She helped lead the study that appears online thisweek in the Early Edition of the Proceedings of the National Academy ofSciences.

The study is the first published report to survey the frequency of transgenes in native varieties of maize.

Fouryears ago, researchers reported finding four cobs of GM maize in Oaxaca, the southern Mexican state where Snow and her colleagues conductedtheir work. And despite the government's ban on planting thegenetically engineered grain, other unpublished studies confirmed thatGM maize had spread to remote mountain villages in the region.

Ina country whose culture and identity revolve heavily around maize, orcorn – the crop was first developed here thousands of years ago – thethought of importing GM varieties that could contaminate native plantsfrightens many citizens.

“The genetic diversity of native maizeis an important resource with great cultural significance,” Snow said.“If farmers think that their highly revered native plants have beenaltered by transgenes, they might even stop planting them.”

“Noone knew how common transgenic corn was in this area, we thought itcould be as high as 5 to 10 percent,” Snow said. “There is greatpotential for transgenes to come across the U.S. border, with millionsof tons of GM grain imported each year for processed food and animalfeed.”

In 1998, the Mexican government imposed a six-yearmoratorium on the release of genetically modified maize in the country.However, farmers in Mexico are allowed to grow genetically engineeredcrops such as cotton and soybeans.

Over the two-year study, theresearchers gathered more than 153,000 seeds from 870 maize plants in125 fields in Oaxaca . They sent these seeds to two commercialcompanies in the United States that can test for very lowconcentrations of transgenic material in maize seeds.

Theresearchers were looking for traces of two key transgenes – one or bothof which are found in all GM maize crops. Test results showed noevidence of the presence of either transgene from any of the seeds.

“Wenow know that transgenic maize is very unlikely to be growing in Oaxaca,” Snow said. “Mexican farmers who don't want transgenes in their cropswill be relieved to find out that these uninvited genes seem to havedisappeared.”

Transgenes that were present in Oaxaca prior tothis study simply may not have survived, Snow said. Modern GM varietiesmay not be very hardy in Oaxaca, even if they can mate with localplants and gain a degree of hardiness that way.

“Indigenous maizegrows mainly in the mountains – the climate and soils can be prettyharsh there,” she said. “Also, the influx of transgenic seeds may havedeclined if farmers became aware of the issue and took extraprecautions with their seed stocks.”

The Mexican government mightapprove the cultivation of GM maize at some point in the future –meanwhile, transgenic seeds can easily enter Mexico from the UnitedStates, and more cases of wandering transgenes seem likely.

Snowconducted the work with scientists from the Instituto Nacional deEcologia (SEMARNAT) and the National Commission for the Knowledge andUse of Biodiversity (CONABIO ), both in Mexico City; and from GeneticID North America, Inc., in Fairfield, Iowa.

This research wassupported in part by the College of Biological Sciences at Ohio Stateand by the Global Environmental Facility (GEF).


Story Source:

The above story is based on materials provided by Ohio State University. Note: Materials may be edited for content and length.


Cite This Page:

Ohio State University. "Genetically Modified Maize Not Found In Southern Mexico." ScienceDaily. ScienceDaily, 12 August 2005. <www.sciencedaily.com/releases/2005/08/050811105417.htm>.
Ohio State University. (2005, August 12). Genetically Modified Maize Not Found In Southern Mexico. ScienceDaily. Retrieved September 2, 2014 from www.sciencedaily.com/releases/2005/08/050811105417.htm
Ohio State University. "Genetically Modified Maize Not Found In Southern Mexico." ScienceDaily. www.sciencedaily.com/releases/2005/08/050811105417.htm (accessed September 2, 2014).

Share This




More Plants & Animals News

Tuesday, September 2, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

We've Got Mites Living In Our Faces And So Do You

We've Got Mites Living In Our Faces And So Do You

Newsy (Aug. 30, 2014) A new study suggests 100 percent of adult humans (those over 18 years of age) have Demodex mites living in their faces. Video provided by Newsy
Powered by NewsLook.com
Washington Wildlife Center Goes Nuts Over Baby Squirrels

Washington Wildlife Center Goes Nuts Over Baby Squirrels

Reuters - US Online Video (Aug. 30, 2014) An animal rescue in Washington state receives an influx of orphaned squirrels, keeping workers busy as they nurse them back to health. Rough Cut (no reporter narration). Video provided by Reuters
Powered by NewsLook.com
Experimental Ebola Drug ZMapp Cures Lab Monkeys Of Disease

Experimental Ebola Drug ZMapp Cures Lab Monkeys Of Disease

Newsy (Aug. 29, 2014) In a new study, a promising experimental treatment for Ebola managed to cure a group of infected macaque monkeys. Video provided by Newsy
Powered by NewsLook.com
Killer Amoeba Found in Louisiana Water System

Killer Amoeba Found in Louisiana Water System

AP (Aug. 28, 2014) State health officials say testing has confirmed the presence of a killer amoeba in a water system serving three St. John the Baptist Parish towns. (Aug. 28) Video provided by AP
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:
from the past week

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins