A study of P. ramorum isolated from different hosts shows changes in virulence:
"The virulence of plant-borne diseases depends on not just the
particular strain of a pathogen, but on where the pathogen has been
before landing in its host, according to new research results.
Scientists
from the University of California System and the U.S. Department of
Agriculture's Agricultural Research Service (USDA ARS) published the
results today in the journal PLoS ONE.
The study
demonstrates that the pattern of gene regulation--how a cell determines
which genes it will encode into its structure and how it will encode
them--rather than gene make-up alone affects how aggressively a microbe
will behave in a plant host.
The pattern of gene regulation is
formed by past environments, or by an original host plant from which the
pathogen is transmitted."
Read more in the press release from the National Science Foundation
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