Navigation Links
Uncovering the mystery of a major threat to wheat
Date:6/1/2010

This press release is available in Spanish.

Agricultural Research Service (ARS) scientists have solved a longstanding mystery as to why a pathogen that threatens the world's wheat supply can be so adaptable, diverse and virulent. It is because the fungus that causes the wheat disease called stripe rust may use sexual recombination to adapt to resistant varieties of wheat.

ARS plant pathologist Yue Jin and his colleagues Les Szabo and Marty Carson at the agency's Cereal Disease Laboratory at St. Paul, Minn., have shown for the first time that stripe rust, caused by Puccinia striiformis, is capable of sexually reproducing on the leaves of an alternate host called barberry, a common ornamental. The fungus also goes through asexual mutation. But sexual recombination offers an advantage because it promotes rapid reshuffling of virulence gene combinations and produces a genetic mix more likely to pass along traits that improve the chances for survival.

Barberry (Berberis spp) is already controlled in areas where wheat is threatened by stem rust, caused by another fungal pathogen. But the work by the ARS team is expected to lead to better control of barberry in areas like the Pacific Northwest, where cool temperatures during most of the wheat growing season make stripe rust a particular threat.

The researchers suspended wheat straw infected with the stripe rust pathogen over barberry plants and found that fungal spores from the wheat infected the barberry. They also took infected barberry leaves, treated them to promote the release of spores, and exposed them to wheat. Tests confirmed that the wheat plants were infected within about 10 days.

The researchers began the study last year after finding infected leaves on barberry plants at two sites on the University of Minnesota campus. They initially thought the symptoms were a sign that the stem rust pathogen had overcome the resistance commonly found in U.S. varieties of barberry.

Instead, they found barberry serving as a sexual or "alternate" host for stripe rust. When the overwintering spores of the stripe rust fungus germinate in the spring, they produce spores that reach barberry leaves, forming structures on the top of the leaves that allow mating between races or strains of the fungus. Spores resulting from this mating can, in turn, infect wheat.


'/>"/>

Contact: Dennis O'Brien
Dennis.Obrien@ars.usda.gov
301-504-1624
United States Department of Agriculture-Research, Education, and Economics
Source:Eurekalert

Related biology news :

1. Uncovering secrets of life in the ocean
2. Uncovering the secrets of ulcer-causing bacteria
3. Uncovering lithiums mode of action
4. Scientists tackle mystery mountain illness
5. Folate mystery finally solved
6. Men shed light on the mystery of human longevity, study finds
7. Magnetic snakes control fluids, gravity-defying droplets, and solving a dragonfly mystery
8. Cassini on the trail of a runaway mystery
9. Time-sharing tropical birds key to evolutionary mystery
10. 480-million-year-old fossil sheds light on 150-year-old paleontological mystery
11. ASU professor helps solve mystery of glassy water
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:2/1/2016)... 2016  Wocket® smart wallet ( www.wocketwallet.com ) announces the launch of ... Fatone . Las Vegas , where Joey appeared ... Las Vegas , where Joey appeared at the Wocket ... video ad was filmed at the Consumer Electronics Show (CES2016) in ... to meet and greet fans. --> ...
(Date:1/25/2016)... Pa. , Jan. 25, 2016   Unisys Corporation ... system at John F. Kennedy (JFK) International Airport, New ... Protection (CBP) identify imposters attempting to enter the ... not belong to them. pilot testing of the ... initially at three terminals at JFK during January 2016. --> ...
(Date:1/22/2016)... 2016 http://www.researchandmarkets.com/research/p74whf/global_biometrics ... "Global Biometrics Market in Retail Sector ... --> http://www.researchandmarkets.com/research/p74whf/global_biometrics ) has announced ... Market in Retail Sector 2016-2020" report ... Research and Markets ( http://www.researchandmarkets.com/research/p74whf/global_biometrics ) has ...
Breaking Biology News(10 mins):
(Date:2/9/2016)... 9, 2016 DelveInsight,s, ... report provides in depth insights on the ... the Protein-Tyrosine Phosphatase 1B (PTP1B) Inhibitors. The ... various stages of development including Discovery, Pre-clinical, ... and Preregistration. Report covers the product clinical ...
(Date:2/8/2016)... 8, 2016 Should antibiotic bone cement products ... to prevent infection after standard total hip or knee ... ECRI Institute have been fielding a lot lately. ... Bottom Line?" --> "Antibiotic Bone ... --> While there isn,t a simple ...
(Date:2/8/2016)... 2016 --> ... innovation-driven oncology company developing next generation cancer therapeutics ... announced that chairman emeritus of Tata Sons Limited, ... company as part of the first close of ... Navam Capital and Aarin Capital. http://photos.prnewswire.com/prnh/20150923/766442 ...
(Date:2/8/2016)... ... February 08, 2016 , ... Thomas J. Todorow has joined ... President for Corporate Services and the Chief Financial Officer at The Children’s Hospital ... Treasury, Managed Care Contracting, Supply Chain, and Investments. , Prior to joining CHOP ...
Breaking Biology Technology: