Reserachers Growing Better Crops in Crowded Fields

With the global population expected to reach 9 billion by 2050, the world's farmers are going to need to produce a lot more food and researchers at the University of Wisconsin-Madison have announced recently that they are getting some positive results from new technology that allows farmers to grow more crops in less area by re-engineering a light-sensing molecule found in plants, known as phytochrome, to allow plants to grow normally even when they're packed in tight.

When packed too tight corn plants will grow tall and spindly as they try to outcompete neighboring plants for access to sunlight, a phenomenon known as shade avoidance.

"The problem with shade avoidance when it comes to food crops is that the plants are spending all this time and energy making stems so they can grow tall, instead of making food that we eat," explains University of Wisconsin-Madison plant geneticist Richard Vierstra, who is developing a work-around. "Instead of 30 inch rows, this technology could enable us to plant corn in 20-inch rows, boosting yields by as much as 50 percent, if we can get the plants to ignore their neighbors."

Phytochrome is the main photoreceptor that allows plants to tell when the lights are on and when they're off. It's what tells seeds to germinate and young seedlings to become green, and enables plants to establish circadian rhythms, an internal clock system, as Vierstra puts it "and it also allows a plant to sense whether it's in full sun or whether it's being shaded by other plants."

In the lab, Vierstra and his scientific team developed the first three-dimensional structures of phytochromes. Using these models, they are now trying to rationally redesign the photoreceptor to have altered light sensing properties. This re-engineering involves creating hundreds of possibly interesting phytochrome mutants, and then testing them for light sensitivity both in the test tube and inside plants. Vierstra's team has found a number of mutants that are extremely sensitive to light and if these mutant phytochrome molecules can be genetically engineered into food crops, it could trick the plants into thinking they are getting plenty of light, even when they're growing in a crowded field.

Vierstra is in the process of patenting the technology, and already knows of a large agribusiness company that's eager to help commercialize it. "We're starting to engineer the phytochrome system in corn, in lines that will eventually be used for breeding," he says. "It's exciting to think about the potential this technology has to boost agricultural productivity." To read more, click HERE.

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