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Background    Xanthomonas citri  subsp. c itri  ( Xac ) is the causal agent of citrus canker. A proteomic analysis under  in planta  infectious and non-infectious conditions was conducted in order to increase our knowledge about the adaptive process of  Xac  during infection.    Results  For that, a 2D–based proteomic analysis of  Xac  at 1, 3 and 5 days after inoculation, in comparison to  Xac  growth in NB media was carried out and followed by MALDI-TOF-TOF identification of 124 unique differentially abundant proteins. Among them, 79 correspond to up-regulated proteins in at least one of the three stages of infection. Our results indicate an important role of proteins related to biofilm synthesis, lipopolysaccharides biosynthesis, and iron uptake and metabolism as possible modulators of plant innate immunity, and revealed an intricate network of proteins involved in reactive oxygen species adaptation during Plants` Oxidative Burst response. We also identified proteins previously unknown to be involved in  Xac - Citrus  interaction, including the hypothetical protein XAC3981. A mutant strain for this gene has proved to be non-pathogenic in respect to classical symptoms of citrus canker induced in compatible plants.    Conclusions  This is the first time that a protein repertoire is shown to be active and working in an integrated manner during the infection process in a compatible host, pointing to an elaborate mechanism for adaptation of  Xac  once inside the plant.    Electronic supplementary material  The online version of this article (doi:10.1186/s12866-017-1063-x) contains supplementary material, which is available to authorized users.

bmc microbiology

Proteomics-based identification of differentially abundant proteins reveals adaptation mechanisms of Xanthomonas citri subsp. citri during Citrus sinensis infection