Journal of Microbiology

Research Support, Non-U.S. Gov't

Identification of seven novel virulence genes from Xanthomonas citri subsp. citri by Tn5-based random mutagenesis: Xue Song , Jing Guo , Wen-xiu Ma , Zhi-yuan Ji , Li-fang Zou , Gong-you Chen , Hua-song Zou; J. Microbiol. 2015;53(5):330-336. Published online May 3, 2015; DOI: https://doi.org/10.1007/s12275-015-4589-3

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To identify novel virulence genes, a mutant library of Xanthomonas citri subsp. citri 29-1 was produced using EZ-Tn5 transposon and the mutants were inoculated into susceptible grapefruit. Forty mutants with altered virulence phenotypes were identified. Nine of the mutants showed a complete loss of citrus canker induction, and the other 31 mutants resulted in attenuated canker symptoms. Southern blot analysis revealed that each of the mutants carried a single copy of Tn5. The flanking sequence was identified by plasmid rescue and 18 different ORFs were identified in the genome sequence. Of these 18 ORFs, seven had not been previously associated with the virulence of X. citri subsp. citri and were therefore confirmed by complementation analysis. Real-time PCR analysis showed that the seven genes were upregulated when the bacteria were grown in citrus plants, suggesting that the expression of these genes was essential for canker development.

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