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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Modified Monosaccharides Content of Xanthan Gum Impairs Citrus Canker Disease by Affecting the Epiphytic Lifestyle of Xanthomonas citri subsp. citri

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Picchi, Simone Cristina [1] ; Granato, Lais Moreira [1] ; Franzini, Maria Julia Festa [1] ; Andrade, Maxuel Oliveira [2] ; Takita, Marco Aurelio [1] ; Machado, Marcos Antonio [1] ; de Souza, Alessandra Alves [1]
Total Authors: 7
[1] Inst Agron Campinas, Ctr Citricultura Sylvio Moreira, Biotechnol Lab, BR-1349070 Sao Paulo - Brazil
[2] Ctr Nacl Pesquisa Energia & Mat, Biosci Natl Lab, BR-13083100 Campinas, SP - Brazil
Total Affiliations: 2
Document type: Journal article
Source: MICROORGANISMS; v. 9, n. 6 JUN 2021.
Web of Science Citations: 0

Xanthomonas citri subsp. citri (X. citri) is a plant pathogenic bacterium causing citrus canker disease. The xanA gene encodes a phosphoglucomutase/phosphomannomutase protein that is a key enzyme required for the synthesis of lipopolysaccharides and exopolysaccharides in Xanthomonads. In this work, firstly we isolated a xanA transposon mutant (xanA::Tn5) and analyzed its phenotypes as biofilm formation, xanthan gum production, and pathogenesis on the sweet orange host. Moreover, to confirm the xanA role in the impaired phenotypes we further produced a non-polar deletion mutant (Delta xanA) and performed the complementation of both xanA mutants. In addition, we analyzed the percentages of the xanthan gum monosaccharides produced by X. citri wild-type and xanA mutant. The mutant strain had higher ratios of mannose, galactose, and xylose and lower ratios of rhamnose, glucuronic acid, and glucose than the wild-type strain. Such changes in the saccharide composition led to the reduction of xanthan yield in the xanA deficient strain, affecting also other important features in X. citri, such as biofilm formation and sliding motility. Moreover, we showed that xanA::Tn5 caused no symptoms on host leaves after spraying, a method that mimetics the natural infection condition. These results suggest that xanA plays an important role in the epiphytical stage on the leaves that is essential for the successful interaction with the host, including adaptive advantage for bacterial X. citri survival and host invasion, which culminates in pathogenicity. (AU)

FAPESP's process: 13/10957-0 - Xylella fastidiosa-vector-host plant interaction and approaches for citrus variegated chlorosis and citrus canker control
Grantee:Alessandra Alves de Souza
Support type: Research Projects - Thematic Grants
FAPESP's process: 17/18570-9 - Functional analysis of CsMAF1, an RNA polymerase III repressor involved in cell growth control and pathogen response in plants
Grantee:Maxuel de Oliveira Andrade
Support type: Scholarships in Brazil - Post-Doctorate
FAPESP's process: 14/50880-0 - INCT 2014: comparative and functional genomics and citrus-assisted breeding
Grantee:Marcos Antonio Machado
Support type: Research Projects - Thematic Grants
FAPESP's process: 13/01395-9 - N-acetyl-cysteine (NAC): a molecule with antimicrobial potential for management of citrus canker.
Grantee:Simone Cristina Picchi
Support type: Scholarships in Brazil - Post-Doctorate
FAPESP's process: 19/01901-8 - Gene silecing of citrus floema: modulation of infection hypersensitivity by Candidatus liberibacter spp
Grantee:Laís Moreira Granato
Support type: Scholarships in Brazil - Post-Doctorate