Study: Wheat Resistance Genes Failing

Many of the genes that allow wheat to ward off Hessian flies are no longer effective in the southeastern United States, and care should be taken to ensure that resistance genes that so far haven’t been utilized in commercial wheat lines are used prudently, according to U.S. Department of Agriculture and Purdue University scientists.

An analysis of wheat lines carrying resistance genes from dozens of locations throughout the Southeast showed that some give little or no resistance to the Hessian fly, a major pest of wheat that can cause millions of dollars in damage to wheat crops each year. Others, even those considered the most effective, are allowing wheat to become susceptible to the fly larvae, which feed on and kill the plants.

Wheat resistance genes recognize avirulent Hessian flies and activate a defense response that kills the fly larvae attacking the plant. However, this leads to strains of the fly that can overcome resistant wheat, much like insects becoming resistant to pesticides.

“The number of genes available to protect wheat is limited. There really aren’t that many,” said Richard Shukle, a research scientist with the USDA Agricultural Research Service Crop Production and Pest Control Research Unit and Purdue adjunct associate professor of entomology. “In the Southeast, having multiple generations of Hessian fly each year enhances the ability of these flies to overcome wheat’s resistance.”

Sue Cambron, a USDA Agricultural Research Service research support scientist, received Hessian flies from 20 locations in Alabama, Georgia, North Carolina, South Carolina and Louisiana and used them to infest 21 varieties of wheat that each contained different resistance genes, most of which have been deployed in commercial wheat, and a few that haven’t yet. While the study did not include all of the 33 named resistance genes, it did show that only five of the 21 genes evaluated would provide effective resistance to flies in the Southeast, and none was effective in all the Southeast locations.

“Even some of the newer genes that haven’t been deployed in cultivars weren’t too effective,” Cambron said.

That’s because flies have likely interacted with, and adapted to, those genes already, said Brandi Schemerhorn, a USDA-ARS entomologist and Purdue assistant professor of entomology. She said it’s possible that some of the genes were introduced to flies unintentionally in plots where wheat cultivars with those genes were being tested for suitability to Southeast climates. The resistance genes also could have come from other plants, such as rye, and the flies may already have started to overcome those genes.

Schemerhorn said she suspects a certain number of flies in any population have the ability to overcome any wheat resistance gene, which defends against the flies’ ability to feed on the plant and starves the insect larvae. When a resistance gene kills off some of the flies, the survivors breed and eventually establish a population that renders the gene ineffective.

“We’re creating a system in which the fly is becoming more virulent,” Schemerhorn said. “What we have to do is slow down that adaptation or virulence.”

Shukle and Schemerhorn suggest stacking genes in a wheat cultivar. There are only a few genes that haven’t been deployed, and they believe combining two of those would be the best option.

“With a small number of identified resistance genes, we can’t afford to release wheat lines with only one resistance gene,” Shukle said. “If you deploy two different resistance genes, it’s unlikely that a population of flies could overcome both of them.”

Schemerhorn is working to combine two of the unreleased genes for testing with Hessian fly populations.

The USDA funded the research. Shukle, Schemerhorn and Cambron collaborated with David Buntin, a University of Georgia professor of entomology; Randy Weisz, a North Carolina State associate professor of crop science and small grains specialist; Kathy Flanders, an Auburn University associate professor of entomology; and Jeff Holland, a Purdue associate professor of entomology. Their findings were published in the Journal of Economic Entomology.

Leave a Reply

Seed/Biotech Stories

Nufarm Seed Treatment lab formulations
Seed/BiotechNew Lab, Company Realignment Strengthen Nufarm’s Position To Serve Seed Treatment Market
October 6, 2016
As part of its “One Nufarm” strategy, Nufarm is realigning and uniting resources to further enhance the focus on its Read More
Soybean Field
Seed/BiotechBayer, West Central Distribution Introduce Fungicde Seed Treatment For Soybeans
October 6, 2016
Bayer and West Central Distribution are introducing a new combination fungicide treatment for soybean plants, Redigo 480 + Trilex, to Read More
Syngenta Seedcare Institute
Seed/BiotechSyngenta Opens New North America Seedcare Institute In Stanton, MN
September 23, 2016
Syngenta unveiled its new Seedcare Institute in Stanton, MN, during a recent grand opening celebration. More than 150 industry leaders, Read More
Corn close up
Crop InputsNY Times: Bayer-Monsanto a Bad Deal for Farmers
September 15, 2016
Via NY Times: Don Halcomb, a 63-year-old farmer in Adairville, KY, is expecting his profit to vanish this year, largely Read More
Trending Articles
Matt Hopkins15 Twitter Accounts Every Ag Professional Must Follow
October 13, 2016
What do singer Katy Perry and the President of the United States have in common? They are two of the Read More
AGCO RG700 cab
OpinionRoadblocks To Precision Ag Innovation
October 5, 2016
On August 29, I got to preside over the PrecisionAg Innovation Series event, “Game-Changing Advances in Precision Farming Technology,” developed Read More
J.C. Ramsdell containment system
EquipmentClear Opportunity In The Tank Market
October 4, 2016
Crop prices may be down, but steel prices are too — and that’s good news for retailers looking to add some Read More
WinField booth Farm Progress
Special ReportsTalking Weed Management Strategies At Farm Progress 2016
October 2, 2016
The annual Farm Progress Show — this year staged in Boone, IA — is always a great place to catch Read More
Corn Field
Eric SfiligojFacing Ag Industry Challenges
September 26, 2016
At the 2016 annual Mid America CropLife Association (MACA) meeting in September, a pair of crop protection company representatives discussed Read More
Bayer Monsanto
Crop InputsBayer-Monsanto Mega-Merger: 6 Things You Need To Know
September 14, 2016
Mega mergers have become almost routine in the agricultural industry. Right on the heels of Monday’s news that fertilizer giants Potash Read More
Latest News
Patriot 25th anniversary
SprayersCase IH Celebrates 25 Years Of Patriot Sprayers At Bens…
October 24, 2016
Case IH executives, employees and special guests celebrated 25 years of production of Case IH Patriot sprayers in a special Read More
4r Nutrient stewardship
StewardshipNominations For The 4R Advocate Program Due October 31
October 24, 2016
Nominations for the 4R Advocate program are due to The Fertilizer Institute by October 31, 2016. The program recognizes agricultural Read More
Corn close up
Eric SfiligojProtecting Agriculture’s Ability To Feed The World
October 24, 2016
The rate of change coming to agriculture is growing, and will continue to do so for the foreseeable future. This Read More
Student Young Worker CHS
CropLife 100CHS Supports #FirstJob Compact
October 24, 2016
CHS joins the White House and many of the country’s largest employers in signing a new initiative centered on helping Read More
Kennebec Grain terminal
CropLife 100Wheat Growers Kennebec Facility Loads First Rail Cars
October 21, 2016
In a season of firsts for Wheat Growers’ Kennebec Grain Terminal, the first 115-car unit train was loaded with soybeans Read More
ManagementThe Latest Dow-DuPont Rumor, Product of the Year Voting…
October 20, 2016
CropLife Editor Eric Sfiligoj shares a new rumor about the Dow-DuPont merger and updates on two CropLife-driven programs, the CropLife Read More
Soybean Closeup
FungicidesFMC Begins Registration Process For New Fungicide Activ…
October 19, 2016
FMC Agricultural Solutions has begun the joint U.S. EPA and Canadian Pest Management Regulatory Agency registration process for bixafen, a new Read More
Soil Young Corn
Industry NewsAgribusiness Search Firm Appoints New Managing Partner
October 18, 2016
Morris Bixby Group, a leading agribusiness search firm providing the highest quality professional recruiting and career advancement services since 2000, Read More
Wheat Field North Dakota
FertilizerUnited Suppliers Acquires Kansas Fertilizer Business
October 17, 2016
United Suppliers, Inc. has purchased the assets of Evans Enterprises, LLC, an ammonium chloride fertilizer business based in Olathe, KS. Read More
Corn Field
Industry NewsFMC Launches New Operations In Argentina, Exits Joint V…
October 17, 2016
FMC Corp. has exited its joint venture with Ruralco Soluciones S.A. FMC has launched new commercial operations, FMC Quimica S.A., Read More
Dow AgroSciences
InsecticidesRenewed Registration Issued For Products Containing Sul…
October 17, 2016
On October 14, 2016, the U.S. EPA re-established the registration of products containing sulfoxaflor (Isoclast Active), including Transform WG, Closer Read More
Eric SfiligojThe Whys Of Agriculture
October 17, 2016
During 2016, there have been myriad challenges facing the whole agricultural industry. Such wide ranging issues as water protection, sustainable Read More
Young Corn Field
FertilizerImproved Phosphorus Management Essential To Feeding Wor…
October 14, 2016
With a global population expected to reach 9 billion people by 2050, improved management of key essential nutrients such as Read More
ManagementHarvest and Crop Price Updates; EPA and Crop Protection…
October 13, 2016
Glyphosate and atrazine get public comment support from ARA as each is reviewed by EPA, and the latest on the Read More
Matt Hopkins15 Twitter Accounts Every Ag Professional Must Follow
October 13, 2016
What do singer Katy Perry and the President of the United States have in common? They are two of the Read More
Corn Field
Industry NewsArysta LifeScience Adds Two Key Account Managers
October 13, 2016
Arysta LifeScience North America recently announced the addition of two key account managers: Doug Hoberty and Rob Wier. Hoberty and Read More
EquipmentDeere Announces Development Deal with Scherer Design
October 12, 2016
Deere & Co. announces a joint development agreement with Scherer Design Engineering, Inc. to develop and commercialize kernel processing solutions Read More
Crop InputsMarrone Bio Innovations Celebrates 10 Years Of Innovati…
October 12, 2016
Richard Rominger, former Deputy Secretary of the USDA and former agricultural secretary of California, emceed a 10th anniversary luncheon celebration on Read More