Featured Research

from universities, journals, and other organizations

Wheat streak resistance gene identified

Date:
August 23, 2010
Source:
Texas A&M AgriLife
Summary:
A microscopic look into the genes of a Colorado wheat variety has allowed scientists to identify a wheat streak mosaic virus-resistance gene. Wheat streak mosaic virus is one of the most common wheat viruses found in the 75 million acres of wheat across the U.S.

Wheat streak mosaic virus is one of the most common wheat viruses found in the 75 million acres of wheat across the U.S.
Credit: Texas AgriLife Research photo

A microscopic look into the genes of a Colorado wheat variety has allowed Texas AgriLife Research scientists to identify a wheat streak mosaic virus-resistance gene.

Wheat streak mosaic virus is one of the most common wheat viruses found in the 75 million acres of wheat across the U.S. -- 3.3 million acres in Texas, said Dr. Charlie Rush, AgriLife Research plant pathologist in Amarillo.

Because there are no chemicals labeled for control of the wheat curl mite, the vector for this virus, researchers must work with wheat breeders to try to find some resistance, Rush said.

Dr. Huangjun Lu, who was a post-doctorate research associate in Amarillo during the study, led the AgriLife Research-Amarillo team of Rush; Dr. Jackie Rudd, wheat breeder; Jacob Price, associate researcher; and Dr. Ravindra Devkota, assistant research scientist. Lu has since become an assistant professor at the University of Florida.

The research was funded by grants from the Texas Wheat Producers Board, the Texas AgriLife Research Monocot Improvement Program and the Texas Cropping Systems Program. This research will be featured in an upcoming issue of Crop Science journal, Rudd said.

"Our goal was to look at the resistance in a germplasm line that was used to produce a variety of wheat in western Kansas called RonL," he said. "This variety's resistance is well known but the inheritance has not been studied until now."

The first part of the study compared the resistance of a known-susceptible variety to wheat streak mosaic virus, Karl 92, with a known-resistant variety, CO960293-2, which is a parent of the RonL variety, Rudd said.

A Nebraska wheat variety, Mace, which showed a high level of wheat streak mosaic resistance was included in the study, as were TAM 111 and TAM 112, two of the top varieties developed by the Amarillo wheat breeding program and grown in Texas that also show some resistance to the virus in field trials, he said.

The growth chamber experiment confirmed previous field work, Rudd said. Mace and CO960293-2 were highly resistant, while Karl 92 was highly susceptible. Both TAM 111 and TAM 112 were intermediate in resistance, with TAM 112 being slightly better than TAM 111.

For the genetic portion of the study, the Colorado line was crossed with TAM 111 and based on that cross, Lu determined the wheat streak mosaic virus resistance was due to a single dominant gene from the Colorado germplasm line, Rudd said.

Further molecular mapping has found the location of the specific gene that provides the resistance, he said.

Rudd explained that wheat has 21 pairs of chromosomes and this gene was mapped to chromosome 3B, "so we now know the general location, and we are developing molecular markers that can be used to track the gene in wheat breeding programs."

Only the Mace gene with known resistance to wheat streak mosaic virus had been named previously and it is Wsm1, he said.

"Now that we have determined they are different genes, this newly identified gene will be known as Wsm2."

The difference, however, is that Wsm1 is on a chromosomal translocation from intermediate wheat grass, a wild relative of wheat, which means it could carry along some less-desirable characteristics such as lower yields, Rudd said. The Wsm2 gene was identified from a bread wheat that does not have the negative traits associated with it.

"Breeders from throughout the U.S. have been using RonL and other sources of Wsm2," he said. "Now that it has been identified, they can track that through marker-assisted selection."

The AgriLife Research wheat breeding program already has a number of crosses with the Wsm2 gene in it, Rudd said. With this information, they now can develop wheat streak mosaic virus resistant varieties quicker.

Previously, the varieties had to go through a series of field trials to help select for the desired trait, he said. The consistency of seeing the symptoms in the field is environmentally influenced and differs from season to season.

"This way, we can develop resistance without the laborious field testing," Rudd said. "A lot of programs will use this information to accelerate their breeding and increase the levels of resistance in new cultivars."


Story Source:

The above story is based on materials provided by Texas A&M AgriLife. The original article was written by Kay Ledbetter. Note: Materials may be edited for content and length.


Cite This Page:

Texas A&M AgriLife. "Wheat streak resistance gene identified." ScienceDaily. ScienceDaily, 23 August 2010. <www.sciencedaily.com/releases/2010/08/100823113434.htm>.
Texas A&M AgriLife. (2010, August 23). Wheat streak resistance gene identified. ScienceDaily. Retrieved October 21, 2014 from www.sciencedaily.com/releases/2010/08/100823113434.htm
Texas A&M AgriLife. "Wheat streak resistance gene identified." ScienceDaily. www.sciencedaily.com/releases/2010/08/100823113434.htm (accessed October 21, 2014).

Share This



More Plants & Animals News

Tuesday, October 21, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

'Cadaver Dog' Sniffs out Human Remains

'Cadaver Dog' Sniffs out Human Remains

AP (Oct. 21, 2014) Where's a body buried? Buster's nose can often tell you. He's a cadaver dog, specially trained to find human remains and increasingly being used by law enforcement and accepted in courts. These dogs are helping solve even decades-old mysteries. (Oct. 21) Video provided by AP
Powered by NewsLook.com
White Lion Cubs Born in Belgrade Zoo

White Lion Cubs Born in Belgrade Zoo

AFP (Oct. 20, 2014) Two white lion cubs, an extremely rare subspecies of the African lion, were recently born at Belgrade Zoo. They are being bottle fed by zoo keepers after they were rejected by their mother after birth. Duration: 00:42 Video provided by AFP
Powered by NewsLook.com
Traditional Farming Methods Gaining Ground in Mali

Traditional Farming Methods Gaining Ground in Mali

AFP (Oct. 20, 2014) He is leading a one man agricultural revolution in Mali - Oumar Diatabe uses traditional farming methods to get the most out of his land and is teaching others across the country how to do the same. Duration: 01:44 Video provided by AFP
Powered by NewsLook.com
Goliath Spider Will Give You Nightmares

Goliath Spider Will Give You Nightmares

Buzz60 (Oct. 20, 2014) An entomologist stumbled upon a South American Goliath Birdeater. With a name like that, you know it's a terrifying creepy crawler. Sean Dowling (@SeanDowlingTV) has the details. Video provided by Buzz60
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:

Strange & Offbeat Stories


Plants & Animals

Earth & Climate

Fossils & Ruins

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