Wild wheat genome sequencing provides 'time tunnel' capable of boosting future food production and safety

July 6, 2017, Tel Aviv University
Wild Emmer wheat. Credit: © Energin .R Technologies 2009 LTD.

A global team of researchers has published the first-ever Wild Emmer wheat genome sequence in Science magazine. Wild Emmer wheat is the original form of nearly all the domesticated wheat in the world, including durum (pasta) and bread wheat. Wild emmer is too low-yielding to be of use to farmers today, but it contains many attractive characteristics that are being used by plant breeders to improve wheat.

The study was led by Dr. Assaf Distelfeld of Tel Aviv University's School of Plant Sciences and Food Security and Institute for Cereal Crops Improvement, in collaboration with several dozen scientists from institutions around the world and an Israel-based company - NRGene, which developed the bioinformatics technology that accelerated the research.

"This research is a synergistic partnership among public and private entities," said Dr. Daniel Chamovitz, Dean of Tel Aviv University's George S. Wise Faculty of Life Sciences, who was also involved in the research. "Ultimately, this research will have a significant impact on global food safety and security."

"Our ability to generate the Wild Emmer wheat genome sequence so rapidly is a huge step forward in genomic research," said Dr. Curtis Pozniak from the University of Saskatchewan, a project team member and Chair of the Canadian Ministry of Agriculture Strategic Research Program. "Wheat accounts for almost 20% of the calories humans consume worldwide, so a strong focus on improving the yield and quality of wheat is essential for our future food supply."

Wild Emmer wheat. Credit: © Energin .R Technologies 2009 LTD.
"From a biological and historical viewpoint, we have created a 'time tunnel' we can use to examine wheat from before the origins of agriculture," said Dr. Distelfeld. "Our comparison to modern wheat has enabled us to identify the genes involved in domestication - the transition from wheat grown in the wild to modern day varieties. While the seeds of readily fall off the plant and scatter, a change in two genes meant that in domesticated wheat, the seeds remained attached to the stalk; it is this trait that enabled humans to harvest wheat."

"This new resource allowed us to identify a number of other genes controlling main traits that were selected by early humans during wheat domestication and that served as foundation for developing modern wheat cultivars," said Dr. Eduard Akhunov of Kansas State University. "These genes provide an invaluable resource for empowering future breeding efforts. Wild Emmer is known as a source of novel variation that can help to improve the nutritional quality of grain as well as tolerance to diseases and water-limiting conditions."

"New genomic tools are already being implemented to identify novel genes for wheat production improvement under changing environment," explains Dr. Zvi Peleg of the Hebrew University of Jerusalem, Israel. "While many modern wheat cultivars are susceptible to water stress, Wild Emmer has undergone a long evolutionary history under the drought-prone Mediterranean climate. Thus, utilization of the wild genes in wheat breeding programs promotes producing more yield for less water." "The wheat genome is much more complex than most of the other crops and has agenome four times the size of a human genome." said Dr. Gil Ronen, NRGene's CEO. "Still, the computational technology we developed has allowed us to quickly assemble the very large and complex genome found in Wild Emmer's 14 chromosomes to a standard never achieved before in genomic studies."

Wild Emmer wheat. Credit: © Energin .R Technologies 2009 LTD.

For the first time, the sequences of the 14 chromosomes of Wild Emmer wheat are collapsed into a refined order, thanks to additional technology that utilizes DNA and protein links. "It was originally tested in humans and recently demonstrated in barley, both of which have smaller genomes than Wild Emmer wheat," says Dr. Nils Stein, the Head of Genomics of Genetic Resources at Leibniz Institute of Plant Genetics and Crop Plant Research in Germany. "These innovative technologies have changed the game in assembling the large cereal genomes."

"This sequencing approach used for Wild Emmer wheat is unprecedented and has paved the way to sequence durum wheat (the domesticated form of Wild Emmer). Now we can better understand how humanity transformed this wild plant into a modern, high-yielding and high-quality crop," said Dr. Luigi Cattivelli, Head of the CREA Research Centre for Genomics and Bioinformatics (Italy) and coordinator of the International Durum Wheat Genome Sequencing Consortium. "This Wild Emmer wheat sequencing and approach is an invaluable contribution to the entire community to improve and better understand nutritional mechanisms," said Dr. Hikmet Budak, Montana Plant Science Endowed Chair at Montana State University.

"We now have the tools to study crops directly and to make and apply our discoveries more efficiently than ever before," concluded Dr. Distelfeld.

Explore further: A lesson from wheat evolution: From the wild to our spaghetti dish

More information: R. Avni el al., "Wild emmer genome architecture and diversity elucidate wheat evolution and domestication," Science (2017). science.sciencemag.org/cgi/doi … 1126/science.aan0032

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