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Surface motility of Xylella fastidiosa visualized by oblique illumination

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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.

Des observations par illumination oblique en stéréomicroscopie ont révélé la présence de deux types de traces de mouvement laissées par des souches de Xylella fastidiosa (génotypes A et G) isolées d’échantillons de brûlure foliaire de l’amandier, à la surface des milieux de culture PW et PD3. Les souches provenant du génotype A montraient des traces de mouvement incurvées alors que les souches du génotype G montraient des traces de mouvement droites. Des halos ont été trouvés autour des colonies du génotype G, dus à l’excrétion de facteurs ou (et) de composés inconnus qui pourraient être liés à la motilité bactérienne de surface.

Document Type: Research Article

Publication date: March 1, 2007

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  • Published since 1954, this monthly journal contains new research in the field of microbiology including applied microbiology and biotechnology; microbial structure and function; fungi and other eucaryotic protists; infection and immunity; microbial ecology; physiology, metabolism and enzymology; and virology, genetics, and molecular biology. It also publishes review articles and notes on an occasional basis, contributed by recognized scientists worldwide.
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