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Updated: Jul 14, 2026

Visualization of Twitching Motility and Characterization of the Role of the PilG in Xylella fastidiosa
Published on: April 8, 2016
Surface motility of Xylella fastidiosa visualized by oblique illumination
1United States Department of Agriculture, Agricultural Research Service, San Joaquin Valley Agricultural Sciences Center, 9611 South Riverbend Avenue, Parlier, CA 93648, USA. jichen@fresno.ars.usda.gov
Abstract:
Stereomicroscopic observations using oblique illuminations revealed the presence of two types of movement trails by Xylella fastidiosa strains (A- and G-genotypes) isolated from almond-leaf scorch samples on the surface of PW and PD3 culture media. The A-genotype strains showed curved motility trails, and the G-genotype strains showed straight motility trails. Haloes were found around some G-genotype colonies due to the excretion of unknown factors and (or) compounds, which might be related to bacterial surface motility.
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