Featured Research

from universities, journals, and other organizations

New Insight Into How Burdensome Weed Climbs Surfaces

Date:
September 20, 2005
Source:
USDA/Agricultural Research Service
Summary:
The way in which a problematic weed overruns and secures itself to crops and man-made structures--and how it clings to the surfaces it climbs--has been revealed by Agricultural Research Service scientists.

Redvine tendrils coil and latch on for support.
Credit: Photo by Christopher Meloche

The way in which a problematic weed overruns and secures itself tocrops and man-made structures--and how it clings to the surfaces itclimbs--has been revealed by Agricultural Research Service scientists.

Redvine (Brunnichia ovata), a perennial woody vine that regeneratesnew growth from woody rootstocks and climbs by its tendrils, is a bigproblem for Mississippi Delta crops, especially soybeans.

Tendrils are organs used by some vines to assist their climbing, butlittle has been known about how they develop or support the vine. Atthe ARS Southern Weed Science Research Unit in Stoneville, Miss., plantphysiologist Kevin C. Vaughn and post-doctoral scientist Christopher G.Meloche discovered two unique aspects of redvine tendrils.

Redvine tendrils begin as straight, thin and flexible appendages ofthe shoot. Vaughn and Meloche discovered that epidermal cells along thelength of the vine's tendril expand in response to touch by elongatingtoward a stimulus. The tendrils themselves, as a whole, respond bycoiling around the object for support. Cells enriched with phenolsbreak apart as the tendrils rub against the object. Then the phenolsreact with an enzyme, polyphenol oxidase (PPO), to produce a sticky,phenolic polymer cement used by the tendrils to stick to the vine'sclimbing surface.

This is the first time the PPO enzyme has been implicated ingenerating an adhesive in a climbing plant. In another first, theresearchers also discovered that the weed's tendrils produce gelatinousfiber cells, the same structures found in leaning trees trying to rightthemselves. These fiber cells are also enriched in lignin to radicallyincrease their strength. Then the cells automatically die, which leadsto a dry, rigid coil structure securely anchoring the vine to thesupport.

The researchers found a unique cell wall composition with thisprocess and are looking at steps in the metabolic pathways that mightbe inhibited to control redvine.

ARS is the U.S. Department of Agriculture's chief in-house scientific research agency.


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. "New Insight Into How Burdensome Weed Climbs Surfaces." ScienceDaily. ScienceDaily, 20 September 2005. <www.sciencedaily.com/releases/2005/09/050920083550.htm>.
USDA/Agricultural Research Service. (2005, September 20). New Insight Into How Burdensome Weed Climbs Surfaces. ScienceDaily. Retrieved July 22, 2014 from www.sciencedaily.com/releases/2005/09/050920083550.htm
USDA/Agricultural Research Service. "New Insight Into How Burdensome Weed Climbs Surfaces." ScienceDaily. www.sciencedaily.com/releases/2005/09/050920083550.htm (accessed July 22, 2014).

Share This




More Plants & Animals News

Tuesday, July 22, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

San Diego Zoo Welcomes New, Rare Rhino Calf

San Diego Zoo Welcomes New, Rare Rhino Calf

Reuters - US Online Video (July 21, 2014) An endangered black rhino baby is the newest resident at the San Diego Zoo. Sasha Salama reports. Video provided by Reuters
Powered by NewsLook.com
Shark Sightings a Big Catch for Cape Tourism

Shark Sightings a Big Catch for Cape Tourism

AP (July 21, 2014) A rise in shark sightings along the shores of Chatham, Massachusetts is driving a surge of eager vacationers to the beach town looking to catch a glimpse of a great white. (July 21) Video provided by AP
Powered by NewsLook.com
$23.6 Billion Awarded To Widow In Smoking Lawsuit

$23.6 Billion Awarded To Widow In Smoking Lawsuit

Newsy (July 20, 2014) Cynthia Robinson claims R.J. Reynolds Tobacco Company hid the health and addiction risks of its products, leading to the death of her husband in 1996. Video provided by Newsy
Powered by NewsLook.com
A Centuries' Old British Tradition Is Far from a Swan Song

A Centuries' Old British Tradition Is Far from a Swan Song

AFP (July 19, 2014) As if it weren't enough that the Queen is the Sovereign of the UK and 15 other Commonwealth realms, she is also the owner of all Britain's unmarked swans. Duration: 02:18 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:
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