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The University of Alberta in Edmonton is one of the top teaching and research universities in Canada, with an international reputation for excellence across the humanities, sciences, creative arts, business, engineering and health sciences.
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Researchers aim to create new strains of wheat with built-in resistance to its biggest insect threat

Th, 18.4.2024
| Original article from: University of Alberta / Adrianna MacPherson, July 05, 2022
There’s only one genetic defence to protect crops from wheat midge — but researchers are looking to change that.
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  • Photo: University of Alberta / Shelley Barkley: Researchers aim to create new strains of wheat with built-in resistance to its biggest insect threat
  • Video: Results Driven Agriculture Research: Project lead James Harynuk explains how his team will analyze small molecules with the aim of giving wheat breeders a genetic road map to breed varieties of wheat that have built-in protection from wheat midge.

Agricultural scientists in Western Canada are teaming up to give wheat a boost of built-in resistance to a destructive pest.

Wheat midge is the number one insect pest threatening wheat crops across Western Canada,” says James Harynuk, a professor in the University of Alberta’s Faculty of Science.

Harynuk notes that in an average year, wheat midge can cause about $60 million in damage to wheat crops. That number stretches to $300 million or more during bad seasons, with increasing wheat prices potentially raising that total even more.

Wheat midge damages wheat by laying their eggs in the kernels to hatch their larvae. And currently, there’s only one reliable genetic defence mechanism to protect wheat crops from this pest.

Sm1 is a gene that can trigger a plant defence response which kills larvae feeding on wheat, but right now it’s the only tool we have available to us. We’re worried the midge might evolve resistance to it,” says Boyd Mori, an assistant professor in the Faculty of Agricultural, Life & Environmental Sciences.

That’s why a team of researchers is looking for a solution. In a project funded for $659,850 in part by Results Driven Agriculture Research (RDAR) and Genome Alberta’s Innovation in Agriculture Genomics Program, Harynuk and co-lead Alejandro Costamagna from the University of Manitoba are looking for alternative traits or genes that will deter wheat midge from laying eggs, the same way Sm1 does.

People have been searching for a resistance gene for a really long time,” says Mori, who is a co-applicant on the project. “Since Sm1 in the 2000s, we just haven’t been able to find anything else.

University of Alberta: Agricultural scientists are working to keep the destructive wheat midge at bay by seeking protective traits that could be bred into new strains of wheat. (Photo: Shelley Barkley)

In search of natural deterrents

Female wheat midge are deterred from particular strains of wheat because of the odour the wheat emits, Mori explains. “We’re looking to identify what those compounds are that the wheat is releasing to prevent wheat midge from laying eggs.

To do this, Harynuk is examining the volatile organic compounds (VOCs) that wheat releases into the air. “A lot of these would be things like terpenes, terpenoids, the same kinds of compounds that contribute to flavour and aroma of plants,” he explains.

A pump pulls the air being sampled through a tube containing absorbent material that traps all those small molecules. Then the researchers use comprehensive two-dimensional gas chromatography to separate all of the different types of molecules in the sample. These are identified and quantified using mass spectrometry.

The researchers will examine 40 wheat lines and take more than 3,000 VOC samples to determine which ones may help protect the wheat from the wheat midge. They will also look at the samples during both the day and the evening, because wheat midge are most active at dusk and may have different behavioural patterns depending on the time of day.

Once the researchers identify which VOCs are responsible for preventing wheat midge from laying eggs and destroying wheat crops, they can use this crucial information to create new strains of wheat with protection against wheat midge.

Improving crop yields without relying on pesticides

While a band-aid solution might involve some type of emitter device which slowly releases deterrent molecules, Harynuk explains that could become a huge burden in terms of cost and labour. The researchers are instead hoping that their work will allow breeders to develop new lines of wheat which inherently generate deterrent molecules. This would allow farmers to easily keep wheat midge at bay simply by planting the new strains of wheat with built-in resistance.

There’s something the plant is releasing that gets into the air and protects all the other plants in a certain radius,” explains Harynuk. That means the VOCs that deter wheat midge can also offer protection to the plants around them, and farmers wouldn’t necessarily need their wheat crop to be 100 per cent from a resistant line. It may be possible to protect a field by planting a blend of deterrent and non-deterrent wheat.

The project was made possible from funding administered by Results Driven Agriculture Research and from the Canadian Agricultural Partnership, a five-year, $3-billion investment by federal, provincial and territorial governments.

This comprehensive approach the researchers are taking also means the general framework they are using to figure out which wheat lines would best deter wheat midge could potentially be applied to other plant and pest combinations.

Other researchers could copy the formula we have, as long as they have the infrastructure to support the work, and find new and exciting ways to help improve agricultural yields with less of a reliance on pesticides,” says Harynuk.

This is the sort of thing that could be a really big game changer for the wheat industry and this pest.

University of Alberta
 

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