Featured Research

from universities, journals, and other organizations

E. coli adapts to colonize plants

Date:
October 30, 2012
Source:
Norwich BioScience Institutes
Summary:
New research has given new clues as to how some E. coli strains, normally at home in mammalian gastrointestinal tracts, have adopted slightly different transmission strategies, with some being better adapted to live on plants than others.

New research from the Institute of Food Research has given new clues as to how some E. coli strains, normally at home in mammalian gastrointestinal tracts, have adopted slightly different transmission strategies, with some being better adapted to live on plants than others.

Related Articles


In the light of recent outbreaks of food poisoning due to contamination of vegetables by dangerous strains of E. coli, this information will be useful to making sure our food remains safe.

E. coli is most at home in the warm, moist, nutrient-rich environment found in the gastrointestinal tract of warm-blooded animals. But to disperse from one host to another these bacteria must get out into the world. There is evidence that some E. coli can survive for several weeks outside the host, and even grow in water or soil. But it is on plant matter that E. coli colonisation has become a concern, as although most types of E. coli are harmless, the presence of pathogenic strains on fruit and vegetables presents a food safety risk.

To find out more, the IFR team took the first comprehensive look at the differences between the populations of E. coli growing on crop plants and populations in the mammalian gut. Funded by the Biotechnology and Biological Sciences Research Council, they took over 100 isolates from leafy parts of vegetables growing in fields in England. Analysis of these showed that even within the same field the E. coli population is diverse and complex. They then compared these isolates with a standard reference collection of E. coli taken from mammals, including humans, from different continents.

Profiling the two groups found a number of significant differences depending on the source of isolation. Compared to the habitat inside the gut, a leaf surface is a hostile environment for gut bacteria. The temperature fluctuates away from the constant 37 °C inside our bodies, and there is a greater risk of drying out.

The researchers found that E. coli populations derived from plants tended to form biofilms more readily. Biofilms are complex structures formed by populations of bacteria coming together to make a thin film over a surface. They are held together by a protective extracellular matrix of proteins and sugars, and the researchers saw that there was also an increase in the production of components of this matrix in E. coli derived from the fields. These strains also used sucrose and other plant-derived sugars more than the E. coli populations derived from mammalian sources.

Biofilms might help to prevent E. coli drying out outside of its host and being able to take advantage of plant sugars could also aid their survival outside the main host, although overall the plant strains showed lower growth on the usual carbon sources E. coli uses.

An analysis showed that these differences are associated with previously defined phylogentic groups of E. coli showing that different environmental conditions have a selective effect in the evolution of different groups. While some have become more generalised, adapting to life outside the mammalian gut, others have remained specialised for life in this environment, avoiding the associated growth penalty.

"While it was known that different environments harboured different E. coli populations, we now have an idea on how and why this happens," said Sacha Lucchini. "Knowledge of the mechanisms involved in plant colonisation by E. coli provides targets for developing strategies aimed at preventing potentially dangerous E. coli strains from colonising vegetables, thus keeping them off our plates."


Story Source:

The above story is based on materials provided by Norwich BioScience Institutes. Note: Materials may be edited for content and length.


Journal Reference:

  1. Guillaume Mιric, E. Katherine Kemsley, Daniel Falush, Elizabeth J. Saggers, Sacha Lucchini. Phylogenetic distribution of traits associated with plant colonization in Escherichia coli. Environmental Microbiology, 2012; DOI: 10.1111/j.1462-2920.2012.02852.x

Cite This Page:

Norwich BioScience Institutes. "E. coli adapts to colonize plants." ScienceDaily. ScienceDaily, 30 October 2012. <www.sciencedaily.com/releases/2012/10/121030210351.htm>.
Norwich BioScience Institutes. (2012, October 30). E. coli adapts to colonize plants. ScienceDaily. Retrieved December 18, 2014 from www.sciencedaily.com/releases/2012/10/121030210351.htm
Norwich BioScience Institutes. "E. coli adapts to colonize plants." ScienceDaily. www.sciencedaily.com/releases/2012/10/121030210351.htm (accessed December 18, 2014).

Share This


More From ScienceDaily



More Plants & Animals News

Thursday, December 18, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Navy Unveils Robot Fish

Navy Unveils Robot Fish

Reuters - Light News Video Online (Dec. 18, 2014) — The U.S. Navy unveils an underwater device that mimics the movement of a fish. Tara Cleary reports. Video provided by Reuters
Powered by NewsLook.com
Kids Die While Under Protective Services

Kids Die While Under Protective Services

AP (Dec. 18, 2014) — As part of a six-month investigation of child maltreatment deaths, the AP found that hundreds of deaths from horrific abuse and neglect could have been prevented. AP's Haven Daley reports. (Dec. 18) Video provided by AP
Powered by NewsLook.com
When You Lose Weight, This Is Where The Fat Goes

When You Lose Weight, This Is Where The Fat Goes

Newsy (Dec. 17, 2014) — Can fat disappear into thin air? New research finds that during weight loss, over 80 percent of a person's fat molecules escape through the lungs. Video provided by Newsy
Powered by NewsLook.com
The Hottest Food Trends for 2015

The Hottest Food Trends for 2015

Buzz60 (Dec. 17, 2014) — Urbanspoon predicts whicg food trends will dominate the culinary scene in 2015. Mara Montalbano (@maramontalbano) has the story. 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