MINNEAPOLIS (AP) — Scientists say they’re close to producing new “super varieties” of wheat that will resist a virulent fungus while boosting yields up to 15 percent, potentially easing a deadly threat to the world’s food supply.
The research is part of a global drive to protect wheat crops from the Ug99 strain of stem rust. It will be presented next week at a conference in St. Paul that’s part of the Borlaug Global Rust Initiative, based at Cornell University in Ithaca, N.Y., organizers said Thursday.
Scientists will also report that Ug99 variants are becoming increasingly virulent and are being carried by the winds beyond Uganda and other East African countries where they were first identified in 1999. Once infected with the deadly fungus, wheat plants become covered in reddish-brown blisters.
According to a news release issued by the initiative ahead of the symposium, the fungus has now spread across all of eastern and southern Africa, and it might just be a matter of time before it reaches India or Pakistan, and even Australia and the Americas.
“We are facing the prospect of a biological firestorm, but it’s also clear that the research community has responded to the threat at top speed, and we are getting results in the form of new varieties that are resistant to rust and appealing to farmers,” Ronnie Coffman, who heads the Durable Rust Resistance in Wheat project at Cornell, said in the release.
Researchers will report at the conference that new varieties of wheat under development at the International Maize and Wheat Improvement Center in Mexico show resistance to all three kinds of wheat rust — stem rust including Ug99, yellow rust and leaf rust — the release said. Some of those varieties also boost yields 10 to 15 percent, it said.
But significant obstacles must be overcome before the resistant new varieties of wheat can replace the susceptible varieties that make up as much as 90 percent of the wheat now in production, the researchers acknowledged. They called for more investments by wealthy countries and international institutions to continue developing the varieties, to help them keep them effective against diseases that continue to evolve, and to develop the seed production and distribution infrastructure needed to put the new varieties in the hands of poor farmers in developing countries.
The new strains mark a huge advance, said Marty Carson, research director at the U.S. Department of Agriculture’s Cereal Research Laboratory at the University of Minnesota in St. Paul.
“Anytime you can talk about a 15 percent boost in yields from existing varieties, I mean that’s phenomenal. And to get combined resistance to all three rusts, that’s also a very big deal,” said Carson, who wasn’t directly involved in that research. His lab, which is heavily involved in the fight against Ug99, is hosting the conference along with the University of Minnesota.