2009
DOI: 10.1590/s1415-47572009005000110
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Mutation in the xpsD gene of Xanthomonas axonopodis pv. citri affects cellulose degradation and virulence

Abstract: The Gram-negative bacterium Xanthomonas axonopodis pv. citri, the causal agent of citrus canker, is a major threat to the citrus industry worldwide. Although this is a leaf spot pathogen, it bears genes highly related to degradation of plant cell walls, which are typically found in plant pathogens that cause symptoms of tissue maceration. Little is known on Xac capacity to cause disease and hydrolyze cellulose. We investigated the contribution of various open reading frames on degradation of a cellulose compou… Show more

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Cited by 26 publications
(21 citation statements)
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References 27 publications
(38 reference statements)
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“…The medium was 0.5 % carboxymethylcellulose, 0.1 % NaNO 3 , 0.1 % K 2 HPO 4 , 0.1 % KCl, 0.05 % MgSO 4 , 0.05 % yeast extract, 0.1 % glucose and 1.7 % agar [32]. The revelation was done by pouring 0.1 % red Congo solution onto the plates, followed by washing with 1 M NaCl.…”
Section: Cellulase Activitymentioning
confidence: 99%
“…The medium was 0.5 % carboxymethylcellulose, 0.1 % NaNO 3 , 0.1 % K 2 HPO 4 , 0.1 % KCl, 0.05 % MgSO 4 , 0.05 % yeast extract, 0.1 % glucose and 1.7 % agar [32]. The revelation was done by pouring 0.1 % red Congo solution onto the plates, followed by washing with 1 M NaCl.…”
Section: Cellulase Activitymentioning
confidence: 99%
“…In Xcc, it has been demonstrated that extracellular enzymes contribute to canker symptom development by degrading the epidermal cell wall. Different kinds of protein are secreted via the T2SS, including protease, amylase and cellulase (Baptista et al, 2010). Two mutants were found to contain the transposon insertion in the XAC3534/ xpsD and in the XAC0695/xcsD genes.…”
Section: Biofilm-defective Mutant Affected In Chemotaxismentioning
confidence: 99%
“…Interestingly, we found that in addition to the TonB system, the entire Xps type II secretion cluster was recombinant among the pepper pathogenic strains of SC3. The importance of the Xps type II gene cluster in the secretion of numerous plant-cell wall degrading enzymes and virulence has been well established in Xeu (3638). Therefore, it is possible that the recombination-mediated remodeling of the TonB and Xps type II systems may affect the secretion of plant cell-wall degrading enzymes and the regulation of downstream pathogenesis processes, leading to adaptation within the pepper niche.…”
Section: Discussionmentioning
confidence: 99%