Arkansas Wheat: Breeding Aimed at Head Scab Resistance

    Esten Mason, University of Arkansas wheat breeder, screens experimental wheat lines for disease resistance. Photo: Fred Miller, University of Arkansas

    Arkansas scientists are part of a national, multi-institutional research collaboration to combat Fusarium head blight, a serious agricultural disease, also known as scab, that affects wheat and barley crops all across the U.S.

    Esten Mason, a wheat breeder for the Arkansas Agricultural Experiment Station, the research arm of the University of Arkansas System Division of Agriculture, participates with the U.S. Wheat and Barley Scab Initiative in his efforts to develop new scab-resistant wheat varieties. He is currently serving on the group’s executive committee.

    Fusarium head blight is found in every wheat-growing state in the U.S., Mason said. “It impacts developing grain, causing yield loss and produces a mycotoxin that causes digestive illness in humans and animals.”

    Federal regulations provide strict controls on how much of the mycotoxin is permitted in grains for human and animal consumption, Mason said. Its presence in wheat grain can lead to farmers receiving lower prices for their grain, or even rejection of their crop.

    “Control is based on prediction,” Mason said. Predictions are based on a field’s history with the pathogen, other crops grown there and weather predictions. Fusarium is a fungal disease and wet or humid environments provide it with ideal conditions for developing and spreading.

    “If the risk of the pathogen is significant,” Mason said, “the disease can be partially suppressed with fungicide applications around the stage of heading to flowering.”

    Research Partnership

    The best protection against scab is resistant varieties, Mason said. He works in concert with breeders and researchers across the country to develop that resistance. Two promising Arkansas breeding lines with good resistance may be released as varieties this year.

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    The U.S. Wheat and Barley Scab Initiative is a partnership of research and industry that coordinates all the links in the wheat supply chain to address Fusarium head blight, Mason said. Those links include state and federal researchers, wheat and barley growers, grain millers and bakers.

    Mason is also a member of the Southern Soft Wheat Cultivar Development and Host Resistance group, a collaboration of southern wheat breeders that works within the USWBSI. Previously, he was chair of the group for four years, leading the coordinated effort with more than $3 million in grants.

    Annually, the USWBSI awards $7.5 million in research grants, some of which support Mason’s breeding efforts. The money is authorized by the U.S. Farm Bill and distributed through the U.S. Department of Agriculture.

    USWBSI researchers investigate every aspect of wheat variety development and testing and agronomic practices in their efforts to protect America’s wheat crop from Fusarium head blight, Mason said.

    Advanced Research Tools

    Mason said he employs a three-pronged approach that includes phenotypic selection, marker-assisted selection and genomic predictions to discover scab resistance in breeding material and advance promising lines toward public release as improved varieties.

    Phenotypic selection is performed in disease screening nurseries on research facilities in Fayetteville and Newport. Test plots are inoculated with Fusarium head blight by scattering infected corn kernels on the ground. They are then misted with sprinklers to increase humidity. This creates an ideal environment for the pathogen to spread to wheat varieties and breeding lines in the plots.

    Mason then screens the varieties and breeding lines, including Division of Agriculture plants and those from other institutions and seed companies that participate in the research. He identifies wheat plants that demonstrate resistance. They can be crossed with high-yielding breeding lines to develop resistant wheat lines adapted to Arkansas growing conditions.

    Marker-assisted selection uses genetic tests to find breeding lines and varieties that have a gene called Fhb1, which is found in the most resistant wheat plants. Breeding lines with the Fhb1 marker are screened for resistance and advanced in the breeding program.

    Genomic prediction is a new method that uses a plant’s entire genome to determine how it may perform in disease screening. Numeric values are assigned to known genes in wheat DNA based on their association with scab resistance. A breeding line’s score determines its breeding value, and those with high breeding values are predicted to perform well in disease screening tests.

    DNA sequencing for marker-assisted selection and genomic prediction allow Mason to eliminate breeding material with a low expectation of resistance and focus his efforts on those with a high expectation of resistance.

    “We sequence about 1,000 lines each year,” Mason said.

    The sequencing work is in its fourth year and is conducted in cooperation with SunGrains Cooperative, a partnership of six southeastern university breeding programs, including the Division of Agriculture. Each SunGrains partner is also a participant in the USWBSI, Mason said.

    Integrated Program

    Alongside the breeding program, Mason directs the Wheat Variety Testing Program, a part of the Division of Agriculture’s Crop Variety Improvement Program. “We test 4,000 to 5,000 wheat varieties and breeding lines each year,” he said. The tests include Division of Agriculture varieties and breeding lines as well as those from other public and commercial sources. “It’s pretty much anything grown in Arkansas or neighboring states,” Mason said.

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