The first photosynthetic trait in corn is moving toward farmland and shows a strong yield bump in field trials.
Benson Hill Biosystems and Beck’s Hybrids are partnering to bring a photosynthetic efficiency trait to market. The technology will allow corn plants to use sunlight and carbon more efficiently to convert more energy into harvestable grain without additional grower inputs.
The corn market is stocked with transgenic traits for insect resistance and herbicide tolerance, but Benson Hill aims to deliver a fundamentally different path to increase yield and farm sustainability. “In nature, photosynthesis focuses on survival and reproduction, not maximum yield,” explains Matthew Crisp, CEO and co-founder of Benson Hill. “Today, even the most elite germplasm is highly inefficient in converting water, sunlight and carbon into grain.”
More than three years of field trials across 12 diverse sites in the U.S. has resulted in steady yield increases ranging between 8% and 9%, according to Crisp.
The trait has fared well in irrigated and non-irrigated trials ranging from southern Kansas to northern Iowa, according to Todd Mockler, CTO and co-founder of Benson Hill, as well as faculty member at the Donald Danforth Plant Science Center.
“We’ve seen up to a low-medium double digit increase in yield at several locations. But regardless of location, the yield results are always strong because photosynthesis is vitally important,” he says.
Echoing Crisp, Mockler says photosynthetic efficiency is remarkably low in plants: “Take a crop like sugarcane—its photosynthesis efficiency is only about 6%. And imagine a corn field in the summer during a clear day being blasted with sunlight. The corn gets far more light than it can capture through photosynthesis and most of the energy is lost.”
By increasing or decreasing the expression of certain genes, or by adjusting where gene expression takes place in the corn plant (such as specific cell type or leaf portion), genetic switches and circuits can be dialed up or down, essentially altering the efficiency or capacity of photosynthesis, Mockler says. “We used our computational biology platforms to identify genes we thought would have an effect on photosynthesis. We have tested candidates and identified more than a dozen genes in the pipeline that increase photosynthesis when put into plants like corn,” he adds.
Benson Hill is developing a pipeline of photosynthetic traits with different modes of action. Crisp expects to expand the technology to cotton, potatoes, soybeans, sugarcane, wheat and more crops, as the traits are licensed to other companies. The trait Beck’s Hybrids will commercialize is the first of many genes identified by Benson Hill to improve photosynthesis.
Benson Hill and Beck’s Hybrids are not large companies like traditional trait providers, making the partnership all the more significant, Mockler says. “Two smaller companies team up to bring a new trait to market and create more choices for farmers. This is an entirely different approach.”
Benson Hill expects to file a dossier on the photosynthetic trait with USDA by 2021
Learn how USDA is putting breeding on the fast track at bit.ly/plant-breeding-tech