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Researchers unearth bioenergy potential in leaf-cutter ant communities
Date:6/14/2013

symbiotic relationship, L. gongylophorous provides food for the leaf-cutter ant Atta cephalotes by developing fruiting bodies rich in fats, amino acids and other nutrients. To fuel production of these fruiting bodies, the fungus needs sugar, which comes in the form of long cellulose molecules packed inside the leaf clippings the ants deliver. To get at the sugars, the fungus produces enzymes that break the cellulose apart into glucose subunits.

After sequencing the L. gongylophorous genome, the researchers noticed that the fungus seemed to be doing the lion's share of cellulose degradation with its specialized enzymes. However, they also realized that it was by no means working alone: in fact, the gardens are also home to a diversity of bacteria that may help boost the fungus's productivity.

"We think there could potentially be a division of labor between the fungus and bacteria," says Garret Suen, co-author of the study and a UW-Madison assistant professor of bacteriology and Wisconsin Energy Institute researcher.

The researchers have a few leads in their investigation of the mysterious role of bacteria in leaf-cutter ant communities, which they are pursuing in collaboration with JGI. In addition to providing nitrogen and key vitamins, the bacteria appear to help the fungus access energy-rich cellulose by breaking apart other plant polymers that encase it, such as hemicellulose.

Accessing and deconstructing cellulose is also the goal of GLBRC researchers, who want to ferment the stored sugars to ethanol and other advanced biofuels. Enzymes such as those of the leaf-cutting ants' fungus specialize in breaking down leaves, but understanding how they work in the context of the ant community could help researchers create similar methods for processing cellulosic biofuel feedstocks, such as corn stalks and grasses.

The researchers are discovering, however, that both the beauty and the challenge of the leaf-cutte
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Contact: Frank Aylward
faylward@wisc.edu
University of Wisconsin-Madison
Source:Eurekalert

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