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U.S. Department of Energy Office of Biological and Environmental Research

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Symbiotic Relationship with Fungi Benefits Bioenergy Feedstock Poplar
Published: July 26, 2011
Posted: August 23, 2011

The forest soil environment is teeming with microbial communities, including a group of mutualistic fungi known as the ectomycorrhizae. These organisms develop a close association with tree roots, establishing an exchange of nutrients and sugars essential for the health of both plant and microbe. While this phenomenon has been known for a long time, the signaling and regulatory mechanisms of this exchange are poorly understood. Researchers at the DOE Oak Ridge National Laboratory, as part of an international collaboration, have identified and characterized a protein called Mycorrhizal Induced Small Secreted Protein 7 (MiSSP7) that is secreted from the ectomycorrhizal fungus Laccaria bicolor in response to signals diffused from the roots of poplar trees, a promising bioenergy feedstock. They found that this very small protein is imported into the nucleus of the host plant cell where it alters the expression of certain plant genes, similar to the manner in which fungal pathogens work. The result is a "reprogram-ming" of plant cells, through which a beneficial, symbiotic relationship between fungus and plant is established. This relationship enhances growth and productivity of the tree. Understanding the underlying mechanism will help address diverse DOE missions, including bioenergy production, environmental remediation, and carbon cycling and sequestration.

Reference: Plett, J. M., M. Kemppainen, S. D. Kale, A. Kohler, V. Legué, A. Brun, B. M. Tyler, A. G. Pardo, and F. Martin. 2011. "A Secreted Effector Protein of Laccaria bicolor Is Required for Symbiosis Development," Current Biology 21, 1197&ndash1203. DOI:10.1016/j.cub.2011.05.033. (Reference link)

Contact: Cathy Ronning, SC-23.2, (301) 903-9549
Topic Areas:

  • Research Area: Genomic Analysis and Systems Biology
  • Research Area: Microbes and Communities
  • Research Area: Plant Systems and Feedstocks, Plant-Microbe Interactions
  • Research Area: Sustainable Biofuels and Bioproducts

Division: SC-33.2 Biological Systems Science Division, BER


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