Findings on ‘NitroGenes’ to be shared at Agronomy Day
The latest findings on “NitroGenes”—a group of genes identified as having the potential to help power more corn yield with less nitrogen—will be discussed at the 57th annual Agronomy Day at the University of Illinois on August 15.
U of I professor of maize functional genomics Stephen Moose, along with graduate fellow Jessica Bubert, will share their findings on the nine genes, termed NitroGenes, they have identified over the last three years that have proven to affect traits involved in improving nitrogen use efficiency (NUE) in corn. These genes showed an important impact on NUE-related traits such as stover nitrogen content, grain nitrogen concentration, and kernel number.
The ultimate goal of the research is to increase yields through better nitrogen utilization and lower nitrogen inputs, Moose explained. “The improvement of NUE is something that has been on the radar for many years,” he said. “It’s kind of the holy grail of biotechnology if you can make nitrogen-fixing corn.”
While breeders have tried to accomplish these results for some time, Moose said significant progress has not been made for a few reasons. “When you are measuring yield, there are so many things that affect yield and nitrogen is only one of them. Another problem is actually having environments where you can do these evaluations and can separate the nitrogen from other factors. On top of that, having the right genetics to put into the system to actually see where the differences are is important.”
Moose and researchers at the Moose Functional Genomics lab at the U of I reasoned that combining or stacking these favorable NitroGenes by a breeding approach may improve nitrogen utilization, grain yield, and possibly other agronomic traits.
“We took germplasm that was very well studied, not only by us but by other researchers, and we evaluated it in an environment in which nitrogen is separated from other effects. When you do that you discover that there are genes that have a small effect on NUE on their own. The project is putting those all together to see if we get a whopper—more of an effect combined than individually.”
As part of the 2012 trials, two separate populations were grown: an enriched population and a depleted population. “The enriched population has as many good genes with positive effects as we could get in one line. The depleted population has the least number of those NitroGenes with positive effects,” Bubert explained.