University Of Arkansas Developing Aflatoxin-Resistant Corn

University of Arkansas Division of Agriculture plant pathologists are developing transgenic corn lines that could help level the field for corn producers in the South compared to those in the Midwest where a cooler climate eliminates the risk of a major fungal disease that plagues Southern growers.

A major issue for corn in the South is infection by a fungus that produces aflatoxin in the grain, which makes it unmarketable. The fungus, Aspergillus flavus, thrives in corn plants that are stressed by hot, dry weather, says research assistant professor Ron Sayler. Aflatoxin is rarely a concern for corn producers in the Midwest because of the cooler climate there.

In Arkansas, irrigation is highly recommended for corn to reduce the risk of aflatoxin contamination; however, it frequently occurs even in irrigated fields, particularly in a very hot, dry summer such as occurred in 2010, Sayler said. In many third world countries where grain marketing is unregulated, people and farm animals often die from aflatoxin poisoning.

Sayler and assistant professor Burt Bluhm are working to develop transgenic corn lines in which the growth of the A. flavus fungus that produces aflatoxin would be inhibited. The project is funded in part by the Arkansas Corn and Sorghum Promotion Board.

A gene in hyacinth bean has been proven to inhibit the alpha amylase enzyme activity of A. flavus necessary for both fungal growth and the subsequent accumulation of aflatoxins, Sayler said. Plant pathologist Charles Woloshuk isolated the gene about 10 years ago at Purdue University, where Bluhm was a member of the research team before coming to Arkansas. Insertion of the gene into corn was not being pursued, so Bluhm and Sayler picked up the project in Arkansas.

Sayler developed a DNA segment containing the gene and introduced the transgene into corn line Hi II.

Sayler reported that, “the amylase inhibitor gene family member B01 has been cloned into the plant transformation vector 1300S, which is designed to express B01 in all tissues (of the corn plant). Twenty-one lines with the B01 amylase inhibitor transgene have been regenerated and are being grown to maturity in the greenhouse. Seed from each of these lines will be tested for their ability to inhibit Aspergillus flavus infection and aflatoxin accumulation.”

“When you introduce a gene into corn, it goes to different parts of the corn chromosome. Where the gene is located affects the expression of the desired genetic trait,” Sayler said. Tests of seed from each transgenic line will determine which line will significantly inhibit growth of the fungus and production of aflatoxin. Results should be known by this summer, he said.

“I am optimistic that one of the lines will express (amylose inhibitor) levels high enough to inhibit growth of the fungus,” Sayler said. He is also pursuing a different method of expressing the gene in corn to optimize the effectiveness of this technology.

When a transgenic line is identified that significantly inhibits A. flavus growth and aflatoxin development, it will be made available to plant breeders for use in developing improved corn varieties with a combination of traits best suited for Arkansas and other Southern states, Sayler said.

(Source: University of Arkansas news release)

Leave a Reply

Seed/Biotech Stories

Seed/BiotechWater Optimized Seed Flowing Freely
April 1, 2014
As the demand for ag to diminish its water use while maintaining high yields and crop quality increases, three companies are leading the movement to grow more with less water. Read More
Seed/BiotechBayer Applies For Seed Treatment That Protects Against Sudden Death Syndrome
February 26, 2014
If approved, ILeVO seed treatment would be the first product to provide breakthrough protection for soybean seedlings from the soil borne pathogen Fusarium virguliforme, the fungus that causes SDS. Read More
Seed/BiotechSeed Still Central
November 1, 2013
Advancing genetics continue to make seed the crop variable that calls the shots for the season. Read More
Seed/BiotechBayer CropScience, Northstar Agri Industries Launch New Canola Hybrid
October 16, 2013
Northstar Agri Industries and Bayer CropScience have announced the addition of the InVigor L252 hybrid to the Northstar Star Growers High Oil Contract. Read More

Trending Articles

Green Valley Ag facility
Retail FacilitiesGreen Valley Ag Adopts A.J. Sackett’s Precision Fertilizer Blending® Technology At New Facility
July 8, 2014
Sackett's Precision Fertilizer Blending® Technology is making huge strides around the world. Green Valley Ag adopts the technology at its new facility to support its advancing agronomic needs. Read More
Retail FacilitiesWaconia Manufacturing Builds Facility Designed For Speed, Efficiency
July 7, 2014
To make its new hub facility more efficient, Cooperative Elevator enlisted the aid of Waconia Manufacturing. Read More
EquipmentSummer Show Preview 2014: Superior Sprayers Take The Field
July 3, 2014
In this final installment of our coverage of the major categories of Big IRON that retailers can expect to test-drive at this summer’s events, here is a look at 19 sprayers. Read More
Scouting a soybean patch at Green Valley Ag.
EmployeesCropLife Compensation Survey: Battling Talent Drain
July 2, 2014
Retailers too often lose employees to companies outside of agriculture, while recruiting efforts are most often limited to competitors and other ag-focused organizations. Read More
HerbicidesDow AgroSciences Introduces SureStart II Herbicide
June 16, 2014
The enhanced formulation has improved viscosity and increased stability under heat and controls more than 60 high-anxiety grasses and broadleaf weeds found in corn fields. Read More
HerbicidesBASF Investing $270 Million To Expand U.S. Herbicide Production
June 11, 2014
BASF has invested more than $270 million to expand herbicide production capacities in the U.S., including more than 20 new products to be launched over next two years. Read More

Latest News

HerbicidesWillowood To Market Glufosinate
July 28, 2014
Willowood USA recently announced that Federal EPA has approved its technical registration for glufosinate. Read More
InsecticidesHow To Scout For Corn Earworms In Corn
July 28, 2014
In her weekly report, University of Missouri Agronomy Specialist Jill Scheidt discusses what to look for when scouting for corn earworm. Read More
Crop InputsDuPont Pioneer, Weyerhaeuser Enter Technology License A…
July 28, 2014
The agreement brings together agricultural and forestry know-how to sustainably improve crop productivity for corn growers around the world. Read More
EquipmentAGCO Launches Global iPad App
July 28, 2014
The free AGCO Global iPad App can be downloaded from the Apple iTunes Store and features the full family of RoGator self-propelled sprayers and TerraGator high-floatation spreaders. Read More
Eric SfiligojYuma Centennial Ag Supply Earns 2014 National Environme…
July 28, 2014
Colorado-based ag retailer receives top trophy in 24th annual DuPont Crop Protection/CropLife ceremony. Read More
CropLife 100Pinnacle Forms Alliance With Wildlife Managment, Seed O…
July 25, 2014
The strategic alliance will provide Tecomate with key wildlife products, processing facilities, distribution centers and sales through Pinnacle’s ever-growing retail network. Read More
ManagementFranken Presses White House On RFS Support
July 25, 2014
Al Franken and a group of Senate democrats recently met with senior White House official John Podesta to urge the administration to change its position on an EPA proposal. Read More
ManagementASA, FarmLink To Launch ‘Operation Benchmark̵…
July 25, 2014
The American Soybean Association (ASA) and FarmLink are teaming up to help farmers close the $11 billion gap between what they harvested in 2013 and what they could harvest annually. Read More
StewardshipNorthey: Farmers Commit $1.4 Million to Try New Water Q…
July 25, 2014
The practices that are eligible for funding include cover crops, no-till or strip till and using a nitrification inhibitor when applying fall fertilizer. Read More
Precision AgFarmers Learn How Changing World Will Impact Iowa
July 24, 2014
Technology and understanding global consumer demand for Iowa farm products brought hundreds of farmers and agribusiness leaders to Ames recently for the annual Iowa Farm Bureau Federation Economic Summit. Read More
HerbicidesPurdue: Late Season Weeds May Require Manual Removal
July 24, 2014
Hand-rouging and pulling late season weeds by hand may be the best way to remove them, more so than using a herbicide, a Purdue Extension weed scientist says. Read More
Soybean Field
InsecticidesTransform WG, Closer SC Insecticides Receive R&D 10…
July 23, 2014
Dow AgroSciences has received the award from R&D Magazine for Transform WG insecticide and Closer SC insecticide with Isoclast active. Read More
EquipmentKinze, Raven Team Up On 4900 Planter Monitor
July 23, 2014
Kinze Manufacturing announces a partnership with Raven Industries to develop a standalone monitor solution for the Kinze 4900 series planter. With this new Read More
LegislationNew Farm Bill Continues To Confuse As Growers Await USD…
July 23, 2014
The new five-year Farm Bill eliminates many of the direct payments previously payed to growers and could benefit from USDA clarification, reports a Toledo Blade columnist. Read More
EquipmentPrecisionAg.com Relaunches With Responsive Design For M…
July 22, 2014
PrecisionAg, the worldwide leader in precision agriculture information and analysis, announces the launch of its completely redesigned website, PrecisionAg.com. Read More
FungicidesEPA OKs Two Willowood Fungicides
July 21, 2014
The EPA has approved Willowood Azoxy 2SC and Willowood AzoxyProp Xtra. two widely used broad spectrum, preventative fungicides with systemic and curative properties. Read More
Precision AgFarmers Learning Fast As UAVs Take Off
July 17, 2014
Farmers and others interested in how UAVs can be used in agricultural applications were able to learn more about the technology during the recent Precision Aerial Ag Show. Read More
CropLife 100Bobby Knight, Richard Petty To Highlight Ag PhD Field D…
July 17, 2014
Attendees at the July 24 Ag PhD Field Day at Hefty Farms will learn about the latest agricultural technologies, and get a chance to meet legendary sports figures Bobby Knight and Richard Petty. Read More