Featured Research

from universities, journals, and other organizations

Negative cross-resistance helps scientists outmaneuver herbicide-resistant weeds

Date:
September 13, 2012
Source:
Allen Press Publishing Services
Summary:
Kochia, a weed that is rapidly becoming more abundant across southern Canadian prairies and the Great Plains of the United States, can reduce crop yields by up to 60 percent. Fighting this weed has become difficult because more than 90 percent of kochia populations are now resistant to acetolactate synthase (ALS)-inhibiting herbicides. The phenomenon of negative cross-resistance, however, may offer another path to defeating the spread of this weed.

Kochia, a weed that is rapidly becoming more abundant across southern Canadian prairies and the Great Plains of the United States, can reduce crop yields by up to 60 percent. Fighting this weed has become difficult because more than 90 percent of kochia populations are now resistant to acetolactate synthase (ALS)-inhibiting herbicides. The phenomenon of negative cross-resistance, however, may offer another path to defeating the spread of this weed.

The current issue of the journal Weed Technology reports on a greenhouse test of kochia plants. Six alternative herbicides were tested on kochia plants with the resistant mutation. Researchers were looking for differences in the reactions of the resistant kochia compared with the wild plant, which is still susceptible to herbicides.

When a plant becomes resistant to one herbicide, other physiological changes may occur that result in increased sensitivity to other herbicide families. The mutated, resistant plant that is more susceptible to the second herbicide is displaying the characteristic of negative cross-resistance.

By using negative cross-resistance to their advantage, weed scientists can outmaneuver the resistant plants. A plan of resistance management can be formulated to attack the weeds with different herbicides, controlling the resistant populations.

In the current study, researchers treated plants from six ALS resistant kochia accessions that have the Pro197 or Trp574 mutation with six alternative herbicides that attack different sites and growth processes of the plant. No difference was noted between the resistant and the susceptible kochia plants when they were exposed to the herbicides bromoxynil, fluroxypyr, or glyphosate. However, one accession with the Trp574 mutation did show negative cross-resistance.

When exposed to pyrasulfotole, mesotrione, and carfentrazone herbicides, ALS-resistant kochia were, 80, 60, and 50 percent more sensitive than the ALS-susceptible plants. Rather than being ALS-inhibiting, these herbicides target different functions of the plant.


Story Source:

The above story is based on materials provided by Allen Press Publishing Services. Note: Materials may be edited for content and length.


Journal Reference:

  1. Hugh J. Beckie, Eric N. Johnson, Anne Lιgθre. Negative Cross-Resistance of Acetolactate Synthase Inhibitor–Resistant Kochia (Kochia scoparia) to Protoporphyrinogen Oxidase– and Hydroxyphenylpyruvate Dioxygenase–Inhibiting Herbicides. Weed Technology, 2012; 26 (3): 570 DOI: 10.1614/WT-D-12-00020.1

Cite This Page:

Allen Press Publishing Services. "Negative cross-resistance helps scientists outmaneuver herbicide-resistant weeds." ScienceDaily. ScienceDaily, 13 September 2012. <www.sciencedaily.com/releases/2012/09/120913203424.htm>.
Allen Press Publishing Services. (2012, September 13). Negative cross-resistance helps scientists outmaneuver herbicide-resistant weeds. ScienceDaily. Retrieved August 27, 2014 from www.sciencedaily.com/releases/2012/09/120913203424.htm
Allen Press Publishing Services. "Negative cross-resistance helps scientists outmaneuver herbicide-resistant weeds." ScienceDaily. www.sciencedaily.com/releases/2012/09/120913203424.htm (accessed August 27, 2014).

Share This




More Plants & Animals News

Wednesday, August 27, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Super Healthful Fruits and Vegetables: Which Are Best?

Super Healthful Fruits and Vegetables: Which Are Best?

Ivanhoe (Aug. 27, 2014) — We all know that it is important to eat our fruits and vegetables but do you know which ones are the best for you? Video provided by Ivanhoe
Powered by NewsLook.com
Raw: Firefighters Rescue Puppy Stuck in Tire

Raw: Firefighters Rescue Puppy Stuck in Tire

AP (Aug. 26, 2014) — It took Houston firefighters more than an hour to free a puppy who got its head stuck in a tire. (Aug. 26) Video provided by AP
Powered by NewsLook.com
Have You Ever Been 'Sleep Drunk?' 1 in 7 Has

Have You Ever Been 'Sleep Drunk?' 1 in 7 Has

Newsy (Aug. 26, 2014) — A study published in the journal "Neurology" interviewed more than 19,000 people and found 15 percent suffer from being "sleep drunk." Video provided by Newsy
Powered by NewsLook.com
Activists Urge NYC Mayor to Ban Carriage Horses

Activists Urge NYC Mayor to Ban Carriage Horses

AP (Aug. 26, 2014) — A group of New Yorkers are putting Mayor Bill de Blasio on notice for what they say is reneging on his campaign promise to ban carriage horses. They rallied Tuesday near the mayor's Gracie Mansion home. (Aug. 26) 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:
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