/ Modified jul 12, 2016 11:41 a.m.

Fungus Helps Plants Soak Up Carbon Dioxide

Flagstaff ecologist's work shows plants can thrive without nitrogen

Climate Change Fungus Study Ectomycorrhizal fungi (the mushrooms connected to the roots of the tree) increase the uptake of nitrogen by the plant, even when that nutrient is scarce in soils. Arbuscular mycorrhizal fungi (associated with the grass roots on the left) do not provide that advantage to their host. (PHOTO: Victor O. Leshyk )

LISTEN

By Melissa Sevigny, Arizona Science Desk

Climate change scientists know that plants can’t grow larger with extra carbon dioxide unless they also have nitrogen. But a new study coauthored by a Flagstaff ecologist shows fungus can help plants get around that limitation.

The study appears in this month’s journal Science. It reviews more than 80 experiments measuring plant responses to increased CO2.

Bruce Hungate, director of the Center for Ecosystem Science and Society at Northern Arizona University, is one of the coauthors. He was surprised to find a symbiotic relationship between plants and a certain fungus boosted growth even without nitrogen.

“So it turns out ectomycorrhizal fungi are really good at extracting nitrogen from soil,” Hungate said. “And that is what makes those plants able to respond to high CO2 even if they don’t have extra nitrogen supplied from another source, because the fungus helps do the work for them.”

Ectomycorrhizal fungi are found in forests worldwide. Hungate said adding them to computer models could give more accurate predictions for the speed of climate change. Current models estimate global ecosystems soak up about a quarter of human CO2 emissions.

By posting comments, you agree to our
AZPM encourages comments, but comments that contain profanity, unrelated information, threats, libel, defamatory statements, obscenities, pornography or that violate the law are not allowed. Comments that promote commercial products or services are not allowed. Comments in violation of this policy will be removed. Continued posting of comments that violate this policy will result in the commenter being banned from the site.

By submitting your comments, you hereby give AZPM the right to post your comments and potentially use them in any other form of media operated by this institution.
Arizona Public Media broadcast stations are licensed to the Arizona Board of Regents. Arizona Public Media and AZPM are registered trademarks of the Arizona Board of Regents.
The University of Arizona