News
A researcher at The University of Texas at Austin will receive two grants totaling $15 million to study a native prairie grass, including how it can become a sustainable source of bioenergy amid global climate change.
Tom Juenger, a professor of integrative biology, will lead scientists from multiple institutions - including federal agencies, universities and the HudsonAlpha Institute for Biotechnology - on two projects researching switchgrass. A five-year grant from the Department of Energy’s Office of Biological and Environmental Research will provide $11 million for the university and $4 million for partner institutions. Additionally, the National Science Foundation (NSF) awarded a four-year grant of $4 million to Juenger and his team. Both grants begin this fall.
On the larger of the two projects, researchers will collect and sequence the genes of hundreds of switchgrass samples to study how genes and a host of environmental factors - including the soil, bacterial communities that live on the plant and in the soil, weather and the size and growth rate of each plant - affect the plant and its potential as a biofuel. Understanding how different factors affect one another ultimately will provide insights into basic plant biology and allow scientists to identify ways to improve switchgrass as an alternative energy source.
Switchgrass is found in the tallgrass prairies across North America and can thrive in soils unsuitable for other crops, making it useful not only for livestock grazing and to prevent soil erosion, but as a potential biofuel.
Juenger and fellow researchers have examined biofuel applications for switchgrass for years, but the new research will provide much more information about the role of rainfall, genes, soil and other factors in the effectiveness of this common plant as an energy source.
“One of the really interesting things with these grasses is that the climate in which they have found themselves has changed a lot over the last several hundred thousand years,” said Juenger. “As glaciers and climate change occurred, their populations were pushed south. And as glaciers retreated, the populations expanded north.”
The result is a grass that has adapted to a wide variety of environments throughout North America, from the hot and dry landscape of Central Mexico to the snowy climes of Canada. Understanding how switchgrass has adapted to vastly different regions and climates will provide information not only about how it would perform as a biofuel crop now in a given area, but also in future climates.
For the study, switchgrass plants will be grown in 14 test sites ranging north to south across the continent, from South Dakota to central Mexico. Data from the experiments will allow scientists to model and identify optimal traits for switchgrass in given areas. These include plant, microbe and soil traits that could be controlled by breeding, modifying the soil, tweaking the plant’s bacterial communities or even genetic manipulation.
The NSF grant funds a multipart project to study both switchgrass and a close cousin called panicgrass. Panicgrass has a simpler genome to that of switchgrass and is smaller, making it ideal for greenhouse studies.
Another part of the grant will allow the researchers to continue work done through a previous grant led by Juenger that looked at the response of switchgrass to varying levels of drought. Now, Juenger will examine whether years of rain or drought create epigenetic changes that can affect future performance in the grass when conditions switch from one extreme to another.