Navigation Links
Light, photosynthesis help bacteria invade fresh produce
Date:9/28/2009

Exposure to light and possibly photosynthesis itself could be helping disease-causing bacteria to be internalized by lettuce leaves, making them impervious to washing, according to research published in the October issue of the journal Applied and Environmental Microbiology.

Salmonella enterica is a common cause of foodborne gastroenteritis, with an estimated number of 1 to 3 million human cases per year in the United States. Fresh produce is increasingly being implicated as a source of infection. One of the largest foodborne outbreaks in recent history, the Salmonella St. Paul outbreak in 2008 which sickened over 1,400 people, was associated with tomatoes and jalapeno peppers.

Previous studies of foodborne pathogens on produce have found that the bacteria do not only attach to the surface of fresh produce but find their way below the surface of the skin through pores called stomata where they can hide from and resist washing and food sanitizers.

In the study, researchers from the Agricultural Research Organization at the Volcani Center in Israel and Tel-Aviv University examined the role that light and photosynthesis might play on the ability of salmonella bacteria to infiltrate lettuce leaves via stomata. Sterile iceberg lettuce leaves were exposed to bacteria either in the light, in the dark, or in the dark after 30 minutes of exposure to light. Incubation in the light or preexposure to light resulted in aggregation of bacteria around open stomata and invasion into the inner leaf tissue. In contrast, incubation in the dark resulted in a scattered attachment pattern and very little internalization.

The researchers believe that the increased propensity for internalization in the light may be due to several factors. First, in the absence of light plants enter a period of dormancy, where stomata are closed and no photosynthesis takes place. In the light, the stomata are open. Additional findings also suggest that the bacteria are attracted to the open stomata by the nutrients produced during photosynthesis which are not present in the dark.

"The elucidation of the mechanism by which Salmonella invades intact leaves has important implications for both pre- and postharvest handling of lettuce and probably other leafy vegetables. The capacity to inhibit internalization should limit bacterial colonization to the phylloplane and consequently might enhance the effectiveness of surface sanitizers," say the researchers.


'/>"/>

Contact: Jim Sliwa
jsliwa@asmusa.org
202-942-9297
American Society for Microbiology
Source:Eurekalert

Related biology news :

1. Research project aims to control sunlight, extend growing season and conserve energy
2. The sky is not falling: Pollution in eastern China cuts light, useful rainfall
3. Researchers successfully simulate photosynthesis and design a better leaf
4. Discovering the secret code behind photosynthesis
5. Pliable proteins keep photosynthesis on the light path
6. Shuttle brings space-grown strep bacteria back for study
7. The worlds oldest bacteria
8. Bacteria from sponges make new pharmaceuticals
9. Boston University biomedical engineers find chink in bacterias armor
10. University of Leicester scientists discover technique to help friendly bacteria
11. Spaceflight shown to alter ability of bacteria to cause disease
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:3/30/2017)... LOS ANGELES , March 30, 2017  On ... Hack the Genome hackathon at ... This exciting two-day competition will focus on developing health ... experience. Hack the Genome is ... has been tremendous. The world,s largest companies in the ...
(Date:3/28/2017)... 28, 2017 The report "Video ... Monitors, Servers, Storage Devices), Software (Video Analytics, VMS), and ... Global Forecast to 2022", published by MarketsandMarkets, the market ... is projected to reach USD 75.64 Billion by 2022, ... The base year considered for the study is 2016 ...
(Date:3/23/2017)... The report "Gesture Recognition and Touchless Sensing Market by Technology (Touch-based and ... 2022", published by MarketsandMarkets, the market is expected to be worth USD 18.98 ... Continue Reading ... ...      ...
Breaking Biology News(10 mins):
(Date:8/16/2017)... , ... August 16, 2017 , ... ... microbe delivery system, announced it has secured $2M in funding from an impressive ... Angels, Carmen Innovations, and SVG Thrive Fund. With this investment, 3Bar is broadening ...
(Date:8/15/2017)... ... ... Kapstone Medical is proud to announce that it has reached ... inventors develop and safeguard their latest innovations. The company has grown from a ... clients in the United States and around the world. , Company Founder and ...
(Date:8/15/2017)... NY (PRWEB) , ... August 15, 2017 , ... ... first time on Immuno-Oncology 360° (IO360°) programming through a series of upcoming panels and ... held February 7-9, 2018, at The Roosevelt Hotel in New York City. , “With ...
(Date:8/14/2017)... ... August 14, 2017 , ... The Conference Forum has confirmed the ... place on September 6, 2017 at the Marriott Copley Place in Boston, MA. , ... Informatics, and Regulatory Strategy, Pfizer Innovative Research Lab, Pfizer, who leads 19 industry speakers ...
Breaking Biology Technology: