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United States Department of Agriculture

Agricultural Research Service

Title: Method to Continuously Produce Organic Soil Fungi
See also: US Patent Office Full Record

Pacific West Area
  Albany, California

Patent Number: 6576457
Docket Number: 10995
Serial Number: 9737975
Date Patented: 06/10/2003

Technology Description:

ARS researchers have developed a way to continuously grow Vesicular-arbuscular mycorrhizal (VAM) fungi in culture. VAM form a beneficial interaction with a wide range of plants, including horticultural and forage field crops. The fungi promote efficient nutrient absorption and increase plant growth and yield. VAM interactions with the soil play an important role in controlling soil fertility, soil erosion and plant water stress. Overall, using VAM fungi in crop production should reduce fertilizer amounts applied to farmland. The importance of VAM fungi to sustainable agriculture and the ecosystem has led to its commercial development. However, for the past thirty years, progress on VAM cultivation has not been very successful, partly because the research is very difficult and time consuming. ARS researchers have found optimal conditions for propagating the dual culture of root and fungus. Pure and clean VAM fungi can be grown on gel plates in a completely reproducible manner. As a result of this breakthrough, many billions of fungal spores may be produced in test tubes. This invention opens new opportunities for using VAM fungi for low-input agriculture, and soil and environment conservation.

VAM fungi can be used to inoculate the seeds of many different field crops. They can also be used to inoculate ornamental plants and fruit trees. This technology could lead to new commercial opportunities for producing and using VAM.


Please refer to USPN 6,576,457, "Fungal Media and Methods for Continuous Propagation of Vesicular-Arbuscular Mycorrhizal (VAM) Fungi in Root Organ Culture," which issued on June 10, 2003. 


Sui-Shang Hua
Plant Mycotoxins Research
Albany, CA 94710
(510) 559-5905 / Fax: (510) 559-5777

Last Modified: 10/1/2015
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