This is an Accepted Article that has been peer-reviewed and approved for publication in the Cellular Microbiology, but has yet to undergo copy-editing and proof correction. Please cite this article as an "Accepted Article"; doi: 10.1111/j.1462-5822.2008.01282.x
Mutualism versus pathogenesis: The give-and-take in plant-bacteria interactions
© 2008 The Authors. Journal compilation © 2008 Blackwell Publishing Ltd
- Accepted manuscript online: 28 JUN 2010 07:16AM EST
- Accepted for publication 18 December 2008
- Cited By
Pathogenic bacteria and mutualistic rhizobia are able to invade and establish chronic infections within their host plants. The success of these plant-bacteria interactions requires evasion of the plant innate immunity by either avoiding recognition or by suppressing host defences. The primary plant innate immunity is triggered upon recognition of common microbe-associated molecular patterns (MAMPs). Different studies reveal striking similarities between the molecular bases underlying the perception of rhizobial nodulation factors (NF) and MAMPs from plant pathogens. However, in contrast to general elicitors, NF can control plant defences when recognized by their cognate legumes. Nevertheless, in response to rhizobial infection, legumes show transient or local defence-like responses suggesting that Rhizobium is perceived as an intruder although the plant immunity is controlled. Whether these responses are involved in limiting the number of infections or whether they are required for the progression of the interaction is not yet clear. Further similarities in both plant-pathogen and Rhizobium-legume associations are factors such as surface polysaccharides, quorum sensing signals and secreted proteins which play important roles in modulating plant defence responses and determining the outcome of the interactions.