Scientists have found a molecular switch that tells plants when to stop taking in nitrogen. This discovery could one day help crops capture more fertilizer, cut farming costs, and reduce nitrogen pollution.

Researchers from New York University have uncovered one of the major processes by which plants intake nitrogen, revealing how plants absorb nitrogen and know when they have taken in enough of this essential nutrient. This study was conducted and reported in The Plant Cell, August 20. The researchers found a particular protein known as HHO5 that serves as a biological brake.

Nitrogen is an important component for plants but plants don't utilize all the nitrogen fertilizers used by farmers. It has been estimated that only 50% of the total nitrogen fertilizers are absorbed by the plants.

So, what tells a plant to stop feeding?

The research shows that HHO5 becomes active after enough nitrogen has been converted into organic nutrients inside the plant. It then switches on genes involved in processing nitrogen while turning down genes responsible for taking in more inorganic nitrogen from the soil.

“It's essentially the plant saying, ‘I'm full,’” explained Will Hinckley, the NYU doctoral student who led the study.

The team also tested plants that lacked HHO5. Under certain conditions, these plants absorbed nearly three times more nitrogen than normal plants. That result helped confirm that HHO5 plays a major role in controlling nitrogen uptake.

Could farmers eventually need less fertilizer?

This discovery will provide scientists with a clear biological pathway to create crops that use nitrogen more efficiently. It may even be possible for researchers to operate this pathway in order to prevent the plant from terminating nitrogen uptake prematurely.

It would be useful in crops such as corn, where fertilizer use represents one of the largest farm costs. More efficient uptake of nitrogen would enable farmers to get more out of their fertilizers and decrease the amount of leftover nitrogen in the soil. But the discovery is currently at the experimental phase. Scientists have yet to show just how much fertilizer savings there would be from the use of such crops in the marketplace or if the effects would be seen in actual field settings.

A new direction for sustainable farming

The finding could eventually work alongside precision agriculture, soil testing and improved fertilizer application. Instead of only improving where fertilizer is placed, researchers may also be able to improve the plant's ability to capture it.

As Business Fortune observes, the next challenge will be turning this molecular discovery into reliable crop traits. If researchers can safely control the nitrogen switch in major crops, future farms could produce more with fewer nutrient losses, creating a promising path toward more efficient and environmentally responsible agriculture.

 

FAQs

Why is nitrogen important for plants?

Nitrogen supports plant growth and is essential for producing proteins and other important compounds.

What is HHO5?

HHO5 is a protein that helps regulate nitrogen uptake and processing in plants.

How much fertilizer nitrogen do plants absorb?

Researchers estimate that plants absorb about 50% of the nitrogen fertilizer applied to fields.

Could this discovery reduce fertilizer use?

Potentially, yes. More efficient crops could capture a larger share of available nitrogen, although researchers have not yet established how much fertilizer could be saved.

Are these nitrogen-efficient crops available to farmers now?

No. The NYU discovery is still in the research stage and requires further testing before it could lead to commercial crop varieties.