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- W1509129314 abstract "The fire blight pathogen, Erwinia amylovora , commonly infects flowers and shoots of certain rosaceous hosts and systemic (whole‐tree) invasion sometimes follows. The bacterium may be found in the parenchyma of bark tissue and/or in mature xylem vessels of stem tissue. Views differ on initial sites of multiplication and the optimal route for systemic migration. This article presents the evidence on which the different views are based. There are limited observations on orchard pear and apple trees; in most experimental studies, young apple shoots on potted plants were used. Tissue maturity at the site of shoot inoculation is of prime importance. If xylem vessels are damaged, inoculum may be sucked into the vessels and the bacteria will multiply there. In younger tissue, there is less suction pressure. The critical stem entry site for the invasion of cortical parenchyma seems to be near or above the most recently unfolded leaf. No one has suggested that migration in bark tissue cannot be a major route. If the xylem route is followed, the pathogen needs a means of escape into bark tissue, where typical symptoms develop; means of escape from mature xylem vessels have not been demonstrated and remain a matter for speculation. Published evidence does not seem to support the idea that fire blight is a vascular wilt disease, nor that the extracellular polysaccharide produced by E. amylovora is a toxin and responsible for the wilting symptom seen in the early stages of the disease." @default.
- W1509129314 created "2016-06-24" @default.
- W1509129314 creator A5080968357 @default.
- W1509129314 date "2010-11-05" @default.
- W1509129314 modified "2023-10-16" @default.
- W1509129314 title "Fire blight. Why do views on host invasion by Erwinia amylovora differ?" @default.
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- W1509129314 doi "https://doi.org/10.1111/j.1365-3059.2010.02382.x" @default.
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