Featured Research

from universities, journals, and other organizations

Bacteria Tapped To Battle Crop-Damaging Roundworms

Date:
April 24, 2009
Source:
USDA/Agricultural Research Service
Summary:
Beneficial bacteria, aided by a "cocktail" of potent natural compounds, may offer a way to biologically control soybean cyst nematodes and other crop-damaging roundworms.

Soybean cyst nematode and egg. Magnified 1,000X.
Credit: Plate # 10334, courtesy ARS Electron Microscopy Unit

Beneficial bacteria, aided by a "cocktail" of potent natural compounds, may offer a way to biologically control soybean cyst nematodes and other crop-damaging roundworms. That's the implication of ongoing studies by scientists with the Agricultural Research Service (ARS) and the Donald Danforth Plant Science Center (DDPSC) in St. Louis, Mo.

Petri dish tests and live-plant experiments at the St. Louis research center showed that the bacteria—members of the genus Pseudomonas—caused the nematodes to stop moving and, in some cases, disintegrate.

Phenazines, hydrogen cyanide and phloroglucinols are among the Pseudomonas compounds being examined for their biocontrol activity against the nematodes. However, no single compound has emerged as the sole cause of the worms’ demise, notes plant geneticist Patricia Okubara, with the ARS Root Disease and Biological Control Research Unit in Pullman, Wash.

Her DDPSC co-investigator, Chris Taylor, isolated the Pseudomonads from the banks of the Missouri and Mississippi rivers, farms and dried botanical specimens. All told, his Pseudomonas collection totaled 63 strains. Of those, he chose 20 for their ability to infect and kill the soybean cyst nematode (Heterodera glycines), root-knot nematode (Meloidogyne incognita) and/or the nematode Caenorhabditis elegans. Washington State University nematologist Ekaterini Riga showed that four of the 20 strains were also active against M. chitwoodi or M. hapla nematodes.

The cyst nematode is a top target of the scientists’ bacteria-based approach because of the substantial losses its feeding causes to America's $27 billion soybean crop. Treating soil with pesticides, rotating crops and planting resistant varieties help keep the pest's numbers in check. But chemical control is costly, crop rotation isn't always economically feasible, and resistant varieties are eventually overcome by virulent new biotypes of the nematode. Pseudomonads could also be used against quarantine pests, including the potato cyst nematode, Globodera pallida, recently found in Idaho.

According to Okubara, novel controls are needed that can be used as part of an integrated approach, with potential benefits including improved environment health, longer-lasting crop resistance, and reduced production costs.

Another, longer-term approach is to engineer crop plants to produce the nematode-neutralizing compounds themselves, adds Okubara, who began collaborating with Taylor in 2007 under a three-year National Research Initiative grant.


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. "Bacteria Tapped To Battle Crop-Damaging Roundworms." ScienceDaily. ScienceDaily, 24 April 2009. <www.sciencedaily.com/releases/2009/04/090419200651.htm>.
USDA/Agricultural Research Service. (2009, April 24). Bacteria Tapped To Battle Crop-Damaging Roundworms. ScienceDaily. Retrieved September 30, 2014 from www.sciencedaily.com/releases/2009/04/090419200651.htm
USDA/Agricultural Research Service. "Bacteria Tapped To Battle Crop-Damaging Roundworms." ScienceDaily. www.sciencedaily.com/releases/2009/04/090419200651.htm (accessed September 30, 2014).

Share This



More Plants & Animals News

Tuesday, September 30, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

California University Designs Sustainable Winery

California University Designs Sustainable Winery

Reuters - US Online Video (Sep. 27, 2014) Amid California's worst drought in decades, scientists at UC Davis design a sustainable winery that includes a water recycling system. Vanessa Johnston reports. Video provided by Reuters
Powered by NewsLook.com
Argentina Worries Over Decline of Soybean Prices

Argentina Worries Over Decline of Soybean Prices

AFP (Sep. 27, 2014) The drop in price of soy on the international market is a cause for concern in Argentina, as soybean exports are a major source of income for Latin America's third largest economy. Duration: 01:10 Video provided by AFP
Powered by NewsLook.com
Mama Bear, Cubs Hang out in California Backyard

Mama Bear, Cubs Hang out in California Backyard

Reuters - US Online Video (Sep. 27, 2014) A mama bear and her two cubs climb trees, wrestle and take naps in the backyard of a Monrovia, California home. Vanessa Johnston reports. Video provided by Reuters
Powered by NewsLook.com
'Crazy' Climate Forces Colombian Farmers to Adapt

'Crazy' Climate Forces Colombian Farmers to Adapt

AFP (Sep. 26, 2014) Once upon a time, farming was a blissfully low-tech business on Colombia's northern plains. Duration: 02:05 Video provided by AFP
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