Featured Research

from universities, journals, and other organizations

Rust Resistance Genes In Soybeans Identified

Date:
April 6, 2009
Source:
USDA/Agricultural Research Service
Summary:
Using state-of-the-art genomics techniques, scientists have identified a cluster of soybean genes that provide resistance to the fungus which causes Asian soybean rust. The discovery will help defend the $27 billion U.S. soybean crop against the disease, through conventional breeding or biotechnological means.

Scientists from the Agricultural Research Service, Iowa State University and Brazil have identified a cluster of soybean genes that provide resistance to the fungus Phakopsora pachyrhizi, which causes Asian soybean rust.
Credit: Photo courtesy of Reid Frederick, ARS

Using state-of-the-art genomics techniques, a team of scientists from the Agricultural Research Service (ARS), Iowa State University (ISU) and Brazil have identified a cluster of soybean genes that provide resistance to the fungus Phakopsora pachyrhizi, which causes Asian soybean rust (ASR). The discovery will help defend the $27 billion U.S. soybean crop against ASR, through conventional breeding or biotechnological means.

ASR was first detected in the continental United States in 2004. Although fungicide use is effective against ASR, providing farmers with resistant cultivars is more sustainable, according to geneticist Michelle Graham. She's with the ARS Corn Insects and Crop Genetics Research Unit in Ames, Iowa.

Genetic mapping previously linked ASR resistance to five DNA regions, or "loci," within the soybean genome, named Rpp1 through Rpp5. Screening of 15,000 accessions in the ARS soybean germplasm collection revealed how uncommon resistance is: Less than 5 percent of the accessions are resistant.

Graham’s group sequenced the Rpp4 locus and identified a cluster of candidate genes that confer ASR resistance. Comparisons of susceptible and resistant cultivars identified a single candidate gene, Rpp4C4, thought to bestow resistance. Rpp4C4 is one of five nearly identical genes in the Rpp4 locus. Frequent "shuffling" or recombination within the cluster allowed new disease resistance genes to be formed.

For example, soybean cultivar Williams82 has three resistance genes in the cluster and lacks Rpp4C4, making it vulnerable to ASR. However, line PI459025B, the source of Rpp4 resistance, has five candidate genes. “Virus-induced gene silencing" studies were used to turn off the Rpp4 candidate genes in PI459025B, making it susceptible to ASR and confirming the genes’ importance.

Graham, together with Jenelle Meyer, Kerry Pedley and Randy Shoemaker of ARS; Chunling Yang, Chunquan Zhang, Martijn van de Mortel, John Hill and Steve Whitham of ISU; and Ricardo Abdelnoor and Danielle Silva of the Brazilian Agricultural Research Corporation (Embrapa) in Brazil, published their findings recently in the online edition of Plant Physiology.


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. "Rust Resistance Genes In Soybeans Identified." ScienceDaily. ScienceDaily, 6 April 2009. <www.sciencedaily.com/releases/2009/03/090328152908.htm>.
USDA/Agricultural Research Service. (2009, April 6). Rust Resistance Genes In Soybeans Identified. ScienceDaily. Retrieved September 16, 2014 from www.sciencedaily.com/releases/2009/03/090328152908.htm
USDA/Agricultural Research Service. "Rust Resistance Genes In Soybeans Identified." ScienceDaily. www.sciencedaily.com/releases/2009/03/090328152908.htm (accessed September 16, 2014).

Share This



More Plants & Animals News

Tuesday, September 16, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Some Tobacco Farmers Thrive Amid Challenges

Some Tobacco Farmers Thrive Amid Challenges

AP (Sep. 16, 2014) The South's tobacco country is surviving, and even thriving in some cases, as demand overseas keeps growers in the fields of one of America's oldest cash crops. (Sept. 16) Video provided by AP
Powered by NewsLook.com
Conservationists Face Uphill PR Battle With New Shark Rules

Conservationists Face Uphill PR Battle With New Shark Rules

Newsy (Sep. 14, 2014) New conservation measures for shark fishing face an uphill PR battle in the fight to slow shark extinction. Video provided by Newsy
Powered by NewsLook.com
Shocker: Journalists Are Utterly Addicted To Coffee

Shocker: Journalists Are Utterly Addicted To Coffee

Newsy (Sep. 13, 2014) A U.K. survey found that journalists consumed the most amount of coffee, but that's only the tip of the coffee-related statistics iceberg. Video provided by Newsy
Powered by NewsLook.com
Lion Cubs the Pride of San Diego Zoo

Lion Cubs the Pride of San Diego Zoo

Reuters - US Online Video (Sep. 13, 2014) Roars of excitement as a proud lioness shows off her four cubs at the San Diego Zoo Safari Park. Jillian Kitchener reports. Video provided by Reuters
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:
from the past week

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins