Describing the roles of the Type 6 Secretion System in Xanthomonas citri subsp citri physiology: a gene expression analysis approach

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In this work, we have analyzed the gene expression patterns of some T6SS core protein genes during epiphytic growth and infection in Xac to gain further insights in T6SS function in this bacterium. Results show that these genes are induced during epiphytic growth but tightly repressed when Xac is promoting the disease. They demonstrate that the T6SS is not involved in pathogenesis but may be required in important aspects of Xac lifestyle, such as biofilm formation or interbacterial competition.