Navigation Links
E. coli an unlikely contaminant of plant vascular systems
Date:4/1/2011

This press release is available in Spanish.

A technique developed by U.S. Department of Agriculture (USDA) scientists for tracking pathogens has helped confirm that Escherichia coli is not likely to contaminate the internal vascular structure of field-grown leafy greens and thus increase the incidence of foodborne illness.

Agricultural Research Service (ARS) microbiologist Manan Sharma wanted to find out if plant roots could draw in E. coli pathogens from the soil when taking in nutrients and water. He and colleagues modified several types of E. coli-including some highly pathogenic strains that cause foodborne illness-by adding a gene for fluorescence. This allowed them to track the pathogen's journey from the field to the produce.

ARS is USDA's chief intramural scientific research agency, and this work supports the USDA priority of ensuring food safety.

The team, which is located at the ARS Environmental Microbial and Food Safety Laboratory in Beltsville, Md., confirmed that the pathogenic E. coli could survive in the soil for up to 28 days. They also observed that the fluorescent E. coli cells were capable of migrating into the roots of spinach plants.

The researchers also examined baby spinach plants over the course of 28 days after germination to see if any of the E. coli strains were taken up past the roots and into the plant's interior structures. For this part of the study, they grew baby spinach in pasteurized soil and hydroponic media.

At day 28, there was no evidence that the E. coli had become "internalized" in leaves or shoots of baby spinach plants grown in the pasteurized soil. E. coli could be detected in hydroponically-grown spinach samples, but its survival in shoot tissue was sporadic 28 days after the plants had germinated.

These findings strongly suggest that although E. coli can survive in soils, it's highly unlikely that foodborne illness would result from the bacterium becoming "internalized" through roots in leafy produce.

Results from this work were published in the Journal of Food Protection.


'/>"/>

Contact: Ann Perry
301-504-1628
United States Department of Agriculture - Research, Education and Economics
Source:Eurekalert

Related biology news :

1. When it comes to sleep research, fruit flies and people make unlikely bedfellows
2. Unlikely life thriving at Antarcticas Blood Falls
3. Scientific evidence of health problems from past contamination of drinking water at Camp Lejeune is limited and unlikely to be resolved with further study
4. Improved diet and exercise alone unlikely to cure obstructive sleep apnea in obese patients
5. Global warming and other environmental dangers may be solved by unlikely source -- space technology
6. Gulf oil dispersants unlikely to be endocrine disruptors and have relatively low cell toxicity
7. Link between cholesterol compound and multiple sclerosis unlikely, researchers say
8. Newly described contaminant sources in Katrina-flooded homes pose health risks
9. NIST issues human milk and blood serum SRMs for contaminant measurements
10. Bioavailable contaminants come from the Exxon Valdez oil catastrophe
11. Contaminants in groundwater used for public supply
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:3/1/2017)... 1, 2017  Aware, Inc. (NASDAQ: AWRE), a leading ... Richard P. Moberg has resigned, effective March 3, ... Financial Officer and Treasurer of Aware citing a desire ... a member of the Board of Directors of Aware. ... Executive Officer and co-President, General Counsel has been named ...
(Date:2/27/2017)... , Feb. 27, 2017   Strategic Cyber Ventures ... it has led a $3.5 million investment in  Polarity ... Strategic Cyber Ventures is DC based and is led ... Hank Thomas . Ron Gula , also a ... also participated in this series A round of funding. ...
(Date:2/21/2017)... ARMONK, N.Y. and PORTLAND, Ore. ... IBM ) and the Avamere Family of Companies (Avamere ... Care) today announced a six-month research study that will ... caregivers improve eldercare at senior living and health centers. ... facilities, Avamere hopes to gain insights into physical and ...
Breaking Biology News(10 mins):
(Date:3/22/2017)... March 22, 2017 Oramed Pharmaceuticals Inc. ... www.oramed.com ), a clinical-stage pharmaceutical ... delivery systems, announced today that Dr. Miriam ... a presentation titled, "Oral Insulin for Diabetes Treatment: ... Healthtech Institute,s Oligonucleotide and Peptide Therapeutics (OPT) Boston Conference in ...
(Date:3/22/2017)... 22, 2017 MarketNewsUpdates.com News Commentary  ... The traditional ... being pressured as of late due to the rise of ... has a dramatic impact on patient,s quality of life as ... for identifying new forms of opioid formulations that prevent abuse. ...
(Date:3/22/2017)... March 22, 2017   VWR ... of product and service solutions to laboratory ... has acquired EPL Archives, Inc., an international ... the entire regulated product research, development and ... storage and ancillary services. EPL Archives is ...
(Date:3/22/2017)... , ... March 21, 2017 , ... ... biologics. To acquire information on the desired increase and/or decrease in antibody-dependent cellular ... for rapid N-glycosylation profiling of therapeutic antibodies. , To meet this demand, ...
Breaking Biology Technology: