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The Pcb1692ΔexpI mutant strain forms aggregates limited to intercellular spaces but, unlike the wild‐type strain, is unable to occlude xylem tissue. Potato stems were inoculated with Pcb1692_ pMP4657 and Pcb1692ΔexpI‐pMP4657 strains as outlined previously. Transverse stem sections were obtained at 2 cm above and below the point of inoculation and confocal microscopy was used to evaluate the colonization patterns of the two strains.
