Document Detail


Escherichia coli O157:H7 induces stronger plant immunity than Salmonella enterica Typhimurium SL1344.
MedLine Citation:
PMID:  23301812     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Consumption of fresh produce contaminated with bacterial human pathogens has resulted in various, sometimes deadly, disease outbreaks. In this study, we assessed plant defense responses induced by the fully pathogenic bacteria Escherichia coli O157:H7 and Salmonella enterica serovar Typhimurium SL1344 in both Arabidopsis thaliana and lettuce (Lactuca sativa). Unlike SL1344, O157:H7 induced strong plant immunity at both pre-invasion and post-invasion steps of infection. For instance, O157:H7 triggered stomatal closure even under high relative humidity, an environmental condition that generally weakens plant defenses against bacteria in the field and laboratory conditions. SL1344 instead induced a transient stomatal immunity. We also observed that PR1 gene expression was significantly higher in Arabidopsis leaves infected with O157:H7 compared with SL1344. These results suggest that plants may recognize and respond to some human pathogens more effectively than others. Furthermore, stomatal immunity can diminish the penetration of human pathogens through the leaf epidermis, resulting in low bacterial titers in the plant apoplast and suggesting that additional control measures can be employed to prevent food contamination. The understanding of how plant responses can diminish bacterial contamination is paramount in preventing outbreaks and improving the safety of food supplies.
Authors:
Debanjana Roy; Shweta Panchal; Bruce A Rosa; Maeli Melotto
Publication Detail:
Type:  Journal Article; Research Support, N.I.H., Extramural; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Phytopathology     Volume:  103     ISSN:  0031-949X     ISO Abbreviation:  Phytopathology     Publication Date:  2013 Apr 
Date Detail:
Created Date:  2013-03-19     Completed Date:  2013-08-15     Revised Date:  2014-04-13    
Medline Journal Info:
Nlm Unique ID:  9427222     Medline TA:  Phytopathology     Country:  United States    
Other Details:
Languages:  eng     Pagination:  326-32     Citation Subset:  IM    
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MeSH Terms
Descriptor/Qualifier:
Arabidopsis / genetics,  immunology,  microbiology*,  physiology
Colony Count, Microbial
Escherichia coli O157 / growth & development,  physiology*
Gene Expression Regulation, Plant / genetics*
Humans
Humidity
Lettuce / immunology,  microbiology*,  physiology
Plant Diseases / immunology,  microbiology*
Plant Immunity
Plant Leaves / genetics,  immunology,  microbiology,  physiology
Plant Proteins / genetics
Plant Stomata / genetics,  immunology,  microbiology,  physiology
Salmonella typhimurium / growth & development,  physiology*
Grant Support
ID/Acronym/Agency:
5R01AI068718/AI/NIAID NIH HHS; R01 AI068718/AI/NIAID NIH HHS
Chemical
Reg. No./Substance:
0/Plant Proteins; 0/pathogenesis-related proteins, plant
Comments/Corrections

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