Researcher Frdric Choulet explains why mapping the bread genome is so important and discusses sequencing wheat chromosome 3B. (INRA)
Scientists announced Thursday that they are approaching a milestone in humanitys ability to improve bread wheat.
One of the most common and most versatile crops on the planet the main food staple for a third of the world population wheat is remarkably good at adapting to change. But efforts to grow higher-yielding, more nutritious and more resilient wheat in response to population growth and climate change have been slow for one simple reason. Its genes are a big, complicated mess.
Many scientists thought that it would be impossible to map the genome of wheat to figure out how its genes are ordered so that specific traits can be more quickly identified. But a group made up of scientists, breeders and growers say that theyre more than halfway there and that an entire sequence is on the horizon.
Genome sequencing has revolutionized the process of breeding corn and rice, experts said, and is especially important given the stress that climate change will put on the food supply as the worlds population booms.
Human civilization rests on a small handful of crops, all of which were developed with much more stable weather conditions than we see now, said Patrick Schnable, an Iowa State University professor who worked on the genome sequencing of corn. In a world with climate change, we need to help those crops adapt quickly. And to do that, he said, one needs the genome sequence.
I was told by a breeder that it was the single most valuable thing the government has ever done for them, Schnable said. The genetic information has been used to increase crop yields and make crops more resilient to stresses such as pests and weather change.
The same has been true for rice. Its accelerated the discovery of the genes involved in many traits, including those for higher yield and disease resistance, said Jan E. Leach, a Colorado State University professor who is not involved in the study. Its always boggled my mind how ridiculous it is to not have [a complete genome] for wheat, she said, so this is great news.
Thursdays announcement reported that about half of bread wheats genome has been sequenced, which might not sound impressive. But until recently, scientists had something like 5 percent of the information, said Kellye Eversole, executive director of the International Wheat Genome Sequencing Consortium (IWGSC), which organized the research.
She compared the sequencing thus far to a partially completed map. After starting with an empty map and a list of roads, she said, the researchers now have about half the highways in place. Its not very well ordered, she said. You might know theres a Route 1, and that its in Virginia, but you dont know exactly where it is. But its a guide, and its accelerating us towards that complete map.
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Scientists unlock the genetic secrets of bread wheat
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