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The molecular basis of host specialization in bean pathovars of Pseudomonas syringae

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Baltrus, David A., Nishimura, Marc T., Dougherty, Kevin M., Biswas, Surojit, Mukhtar, M. Shahid, Vicente, Joana G., Holub, E. B. and Dangl, J. L. (Jeffery L.) (2012) The molecular basis of host specialization in bean pathovars of Pseudomonas syringae. Molecular Plant-Microbe Interactions, Vol.25 (No.7). pp. 877-888. doi:10.1094/MPMI-08-11-0218 ISSN 0894-0282.

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Official URL: http://dx.doi.org/10.1094/MPMI-08-11-0218

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Abstract

Biotrophic phytopathogens are typically limited to their
adapted host range. In recent decades, investigations have
teased apart the general molecular basis of intraspecific
variation for innate immunity of plants, typically involving
receptor proteins that enable perception of pathogen-associated
molecular patterns or avirulence elicitors from the
pathogen as triggers for defense induction. However, general
consensus concerning evolutionary and molecular factors
that alter host range across closely related phytopathogen
isolates has been more elusive. Here, through genome
comparisons and genetic manipulations, we investigate the
underlying mechanisms that structure host range across
closely related strains of Pseudomonas syringae isolated
from different legume hosts. Although type III secretionindependent
virulence factors are conserved across these
three strains, we find that the presence of two genes encoding
type III effectors (hopC1 and hopM1) and the absence
of another (avrB2) potentially contribute to host range differences
between pathovars glycinea and phaseolicola.
These findings reinforce the idea that a complex genetic
basis underlies host range evolution in plant pathogens.
This complexity is present even in host–microbe interactions
featuring relatively little divergence among both hosts
and their adapted pathogens.

Item Type: Journal Article
Subjects: Q Science > QR Microbiology
Divisions: Faculty of Science, Engineering and Medicine > Science > Life Sciences (2010- )
Library of Congress Subject Headings (LCSH): Pseudomonas syringae -- Genetics, Pseudomonas syringae -- Host plants
Journal or Publication Title: Molecular Plant-Microbe Interactions
Publisher: The American Phytopathological Society
ISSN: 0894-0282
Official Date: 2012
Dates:
DateEvent
2012Published
Volume: Vol.25
Number: No.7
Page Range: pp. 877-888
DOI: 10.1094/MPMI-08-11-0218
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Restricted or Subscription Access
Date of first compliant deposit: 22 December 2015
Date of first compliant Open Access: 22 December 2015
Funder: National Institutes of Health (U.S.) (NIH), United States. Dept. of Energy
Grant number: GM066025 (NIH), 95ER20187 (DOE), GM082279-01 (NIH)

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