Xanthomonas citri subsp. citri ( Xcc ) causes citrus bacterial canker (CBC) on several Citrus species. Xcc requires bacterial aggregation and biofilm formation to colonize the host plant. Those biofilms are dependent on the environmental condition and their structures differ according to the host range of the Xcc strain. Herein, we have visualized and evaluated the extracellular structures produced by Xcc strains with different host range at early stages of biofilm formation, in mature biofilms and during planktonic growth. Moreover, the presence of these structures was related to the transcription of quorum sensing, flagellar and fimbrial genes. Our results demonstrate that the variation in biofilm formation between Xcc strains is associated with expression of fimbrial and flagellar genes which in some cases is dependent on a quorum sensing system.

中文翻译：

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由 Xanthomonas citri subsp. 形成的生物膜的细胞外基质的表征。具有不同宿主范围的柑橘菌株

柑橘黄单胞菌亚种。柑橘 ( Xcc ) 会导致几种柑橘属物种的柑橘细菌溃疡病 (CBC)。Xcc 需要细菌聚集和生物膜形成来定植宿主植物。这些生物膜取决于环境条件，它们的结构根据 Xcc 菌株的宿主范围而有所不同。在此，我们已经可视化并评估了具有不同宿主范围的 Xcc 菌株在生物膜形成的早期阶段、成熟的生物膜和浮游生长过程中产生的细胞外结构。此外，这些结构的存在与群体感应、鞭毛和菌毛基因的转录有关。