Simulation of pressure caused by multiplication and swelling of Erwinia amylovora in intercellular space of host tissue |
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Authors: | Henk J. Schouten |
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Affiliation: | (1) Department of Phytopathology, Wageningen Agricultural University, P.O. Box 8025, 6700 EE Wageningen, the Netherlands;(2) Present address: Centre for Plant Breeding and Reproduction Research (CPRO-DLO), P.O. Box 16, 6700 AA Wageningen, the Netherlands |
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Abstract: | WhenErwinia amylovora grows, in an intercellular space of a host, and fills this space, further multiplication or swelling may create a pressure, and may cause tearing of host tissue. Theoretically, this bacterial pressure equals the actual water potential of the host tissue minus the water potential at which the bacterial biomass would completely fill the intercellular space, but without exerting pressure.Simulation runs indicate that, when the pressure increases, the extracellular slime ofE. amylovora shrinks by releasing water, thus allowing further production of bacterial dry matter. The slime remains around the bacterial cells as a dense substance, low in water content, having a strong capacity to swell when the pressure induces tearing apart of the host tissue. Simulation runs show that the pressure attains its highest values at evening and night.Some fire blight symptoms that illustrate the evidence of bacterial pressure are discussed. |
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Keywords: | fire blight extracellular slime extracellular polysaccharide relative growth rate water potential |
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