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Researchers Find Resistance To Soybean Fungus

Date:
June 22, 2005
Source:
USDA / Agricultural Research Service
Summary:
The first soybean line with genetic resistance to charcoal rot has been released by Agricultural Research Service scientists in Mississippi. Charcoal rot, caused by the soilborne fungus Macrophomina phaseolina, is a major yield-limiting disease of the Mid-South and other soybean-producing regions throughout the world.

On a soybean stem, the dark speckles are the sclerotia of the charcoal rot pathogen.
Credit: Image courtesy William G. Willis, Kansas State University.

The first soybean line with genetic resistance to charcoal rot has been released by Agricultural Research Service scientists in Mississippi.

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Charcoal rot, caused by the soilborne fungus Macrophomina phaseolina, is a major yield-limiting disease of the Mid-South and other soybean-producing regions throughout the world.

The new line, DT97-4290, developed by scientists in the ARS Crop Genetics and Production Research Unit at Stoneville, is a potentially valuable source of resistance to charcoal rot for soybean breeders and producers in areas experiencing yield losses due to the disease.

Charcoal rot symptoms usually appear when weather conditions are hot and dry, causing the soybean plant to lose vigor. In more advanced stages, petioles and leaves may turn yellow and wilt, while remaining attached to the plant. No chemical controls currently exist for charcoal rot, and resistance has been hard to identify.

Field studies were conducted at Stoneville to find charcoal rot resistance among 24 selected soybean genotypes. The researchers identified three breeding lines with genetic resistance, according to Bob Paris, the research geneticist who developed the line with Alemu Mengistu, a soybean pathologist.

The new line was selected for its adaptation to the clay soils of the lower Mississippi River valley, and for its field resistance to charcoal rot, soybean mosaic virus and stem canker, and moderate resistance to frogeye leafspot.

Genetic material of this release will be deposited in the National Plant Germplasm System, where it will be available for soybean researchers and breeders.

ARS is the U.S. Department of Agriculture's chief scientific research agency.


Story Source:

The above story is based on materials provided by USDA / Agricultural Research Service. Note: Materials may be edited for content and length.


Cite This Page:

USDA / Agricultural Research Service. "Researchers Find Resistance To Soybean Fungus." ScienceDaily. ScienceDaily, 22 June 2005. <www.sciencedaily.com/releases/2005/06/050619192818.htm>.
USDA / Agricultural Research Service. (2005, June 22). Researchers Find Resistance To Soybean Fungus. ScienceDaily. Retrieved December 20, 2014 from www.sciencedaily.com/releases/2005/06/050619192818.htm
USDA / Agricultural Research Service. "Researchers Find Resistance To Soybean Fungus." ScienceDaily. www.sciencedaily.com/releases/2005/06/050619192818.htm (accessed December 20, 2014).

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