Texas A&M to Participate in Applied Wheat Genome Research

Writer: Kay Ledbetter, (806) 677-5608,skledbetter@ag.tamu.edu
Contact: Dr. Jackie Rudd, (806) 677-5600,jcrudd@ag.tamu.edu

AMARILLO – A new $5 million grant to wheat breeders could shorten the time between the outbreak of diseases and the development of resistant wheat varieties, said the Texas Agricultural Experiment Station state wheat breeder.

Agriculture Secretary Mike Johanns announced the U.S. Department of Agriculture’s Cooperative State Research, Education and Extension Service will administer the award through the National Research Initiative.

Dr. Yiqun Weng, Texas Agricultural Experiment Station state wheat breeder, loads DNA samples for electrophoresis to analyze the fingerprinting profiles of greenbug resistant wheat varieties. (Texas Agricultural Experiment Station photo by Kay Ledbetter)

The research supported by the grant is called “marker assisted selection,” said Dr. Jackie Rudd, Experiment Station state wheat breeder in Amarillo. Marker assisted selection takes genome research from the laboratory to the field via new disease-resistant, high quality varieties.

Texas’ portion of the $5 million grant will be $182,750 over four years, Rudd said. The Experiment Station recognized the value of this program to Texas wheat producers and matched the first two years of funding with a Cropping Systems Program grant.

Some of the money will go directly to Dr. Monica Menz, director of the Plant Genome Technology Laboratory at the Texas A&M University Institute for Plant Genome Biotechnology, and her work with leaf rust resistance.

Another portion will be utilized by Dr. Yiqun Weng, Experiment Station research scientist in Amarillo, who is working with greenbug resistance.

Rust problems alone reduced the grain yield of the Texas wheat crop by about 20 percent last year, Rudd said. This cooperative technology will not only help to combat that, but will help produce better grain products and help maintain the international competitiveness of U.S. wheat.

A traditional breeding program evaluates genetic variability of a selected line of wheat by planting it over several years in many locations, and then determining if it has the resistance needed, Rudd said.

“It’s a ‘what you see is not what you get’ situation,” he said. “This new grant will help us look at the DNA of a wheat plant to determine what genes it has before it is planted, rather than wait to see if it is expressed in the field. It’s a way of increasing our overall efficiency.”

Texas’ Experiment Station wheat-breeding program has been working to identify the molecular markers for leaf rust resistance and greenbug resistance for the past five years, Rudd said.

Molecular markers can be a piece of DNA, near a gene or within a gene, that signals the presence of a useful trait such as disease resistance.

In traditional breeding, if 1,000 rows of wheat lines are planted, about half will be thrown out due to stripe or leaf rust problems, he said.

“If we can look at the DNA before planting those rows and determine they have the effective resistance genes, we can be more selective in our planting,” Rudd said.

Traditional wheat breeding requires planting thousands of lines of wheat, most of which will be discarded because they lack the desired traits. (Texas Agricultural Experiment Station photo by Dr. Jackie Rudd)

Leaf rust resistance, for instance, is hard to maintain because the pathogen changes, sometimes as often as every few years, he said. A more durable resistance can be obtained by combining genes that may only have partial resistance individually. This can be done much more efficiently using molecular markers.

The genetic information will be stored in national databases and seed stocks deposited in USDA’s Small Grain Collection, providing long-term public access of genetic information and resources for the wheat breeders and researchers nationwide, USDA officials said.

Wheat is one of the few major crops where public sector researchers are largely responsible for providing new varieties for farmers, Rudd said. The grant will bring these public wheat-breeding programs into a community, making the most efficient use of the public money.

“This is a great example of how public money can be brought together and allow us to accomplish what none of us could accomplish individually,” he said.


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