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PLoS One. 2014 Feb 14;9(2):e87970. doi: 10.1371/journal.pone.0087970. eCollection 2014.

Response of Medicago truncatula seedlings to colonization by Salmonella enterica and Escherichia coli O157:H7.

Author information

1
Department of Agronomy, University of Wisconsin-Madison, Madison Madison, Wisconsin, United States of America.
2
Department of Bacteriology, University of Wisconsin-Madison, Madison, Wisconsin, United States of America.

Abstract

Disease outbreaks due to the consumption of legume seedlings contaminated with human enteric bacterial pathogens like Escherichia coli O157:H7 and Salmonella enterica are reported every year. Besides contaminations occurring during food processing, pathogens present on the surface or interior of plant tissues are also responsible for such outbreaks. In the present study, surface and internal colonization of Medicago truncatula, a close relative of alfalfa, by Salmonella enterica and Escherichia coli O157:H7 were observed even with inoculum levels as low as two bacteria per plant. Furthermore, expression analyses revealed that approximately 30% of Medicago truncatula genes were commonly regulated in response to both of these enteric pathogens. This study highlights that very low inoculum doses trigger responses from the host plant and that both of these human enteric pathogens may in part use similar mechanisms to colonize legume seedlings.

PMID:
24551073
PMCID:
PMC3925098
DOI:
10.1371/journal.pone.0087970
[Indexed for MEDLINE]
Free PMC Article

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