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 October 23, 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 October 23, 2014).

Share This



More Plants & Animals News

Thursday, October 23, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Working Mother DIY: Pumpkin Pom-Pom

Working Mother DIY: Pumpkin Pom-Pom

Working Mother (Oct. 22, 2014) How to make a pumpkin pom-pom. Video provided by Working Mother
Powered by NewsLook.com
Goofy Dinosaur Blends Barney and Jar Jar Binks

Goofy Dinosaur Blends Barney and Jar Jar Binks

AP (Oct. 22, 2014) A collection of dinosaur bones reveal a creature that is far more weird and goofy-looking than scientists originally thought when they found just the arm bones nearly 50 years ago, according to a new report in the journal Nature. (Oct. 22) Video provided by AP
Powered by NewsLook.com
San Diego Zoo's White Rhinos Provide Hope for the Critically Endangered Species

San Diego Zoo's White Rhinos Provide Hope for the Critically Endangered Species

Reuters - Light News Video Online (Oct. 22, 2014) The pair of rare white northern rhinos bring hope for their species as only six remain in the world. Elly Park reports. Video provided by Reuters
Powered by NewsLook.com
Raw: Bear Cub Strolls Through Oregon Drug Store

Raw: Bear Cub Strolls Through Oregon Drug Store

AP (Oct. 22, 2014) Shoppers at an Oregon drug store were surprised by a bear cub scurrying down the aisles this past weekend. (Oct. 22) Video provided by AP
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