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Genes 2015, 6(3), 714-733; doi:10.3390/genes6030714

Full Genome Sequence Analysis of Two Isolates Reveals a Novel Xanthomonas Species Close to the Sugarcane Pathogen Xanthomonas albilineans

1
CIRAD UMR BGPI, TA A-54/K, Campus International de Baillarguet, F-34398 Montpellier Cedex 5, France
2
INRA, Laboratoire des Interactions Plantes-Microorganismes (LIPM), UMR441, 24 Chemin de Borde Rouge—Auzeville CS52627, F-31326 Castanet Tolosan Cedex, France
3
CNRS, Laboratoire des Interactions Plantes-Microorganismes (LIPM), UMR2594, 24 Chemin de Borde Rouge—Auzeville CS52627, F-31326 Castanet Tolosan Cedex, France
Present Address: University of Florida, IFAS, Everglades Research and Education Center, Belle Glade, FL 33430, USA
*
Author to whom correspondence should be addressed.
Academic Editor: J. Peter W. Young
Received: 30 April 2015 / Revised: 3 July 2015 / Accepted: 14 July 2015 / Published: 23 July 2015
(This article belongs to the Section Population and Evolutionary Genetics and Genomics)
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Abstract

Xanthomonas albilineans is the bacterium responsible for leaf scald, a lethal disease of sugarcane. Within the Xanthomonas genus, X. albilineans exhibits distinctive genomic characteristics including the presence of significant genome erosion, a non-ribosomal peptide synthesis (NRPS) locus involved in albicidin biosynthesis, and a type 3 secretion system (T3SS) of the Salmonella pathogenicity island-1 (SPI-1) family. We sequenced two X. albilineans-like strains isolated from unusual environments, i.e., from dew droplets on sugarcane leaves and from the wild grass Paspalum dilatatum, and compared these genomes sequences with those of two strains of X. albilineans and three of Xanthomonas sacchari. Average nucleotide identity (ANI) and multi-locus sequence analysis (MLSA) showed that both X. albilineans-like strains belong to a new species close to X. albilineans that we have named “Xanthomonas pseudalbilineans. X. albilineans and “X. pseudalbilineans” share many genomic features including (i) the lack of genes encoding a hypersensitive response and pathogenicity type 3 secretion system (Hrp-T3SS), and (ii) genome erosion that probably occurred in a common progenitor of both species. Our comparative analyses also revealed specific genomic features that may help X. albilineans interact with sugarcane, e.g., a PglA endoglucanase, three TonB-dependent transporters and a glycogen metabolism gene cluster. Other specific genomic features found in the “X. pseudalbilineans” genome may contribute to its fitness and specific ecological niche. View Full-Text
Keywords: Xanthomonas albilineans; novel “Xanthomonas pseudalbilineans” species; MLSA; ANI Xanthomonas albilineans; novel “Xanthomonas pseudalbilineans” species; MLSA; ANI
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Pieretti, I.; Cociancich, S.; Bolot, S.; Carrère, S.; Morisset, A.; Rott, P.; Royer, M. Full Genome Sequence Analysis of Two Isolates Reveals a Novel Xanthomonas Species Close to the Sugarcane Pathogen Xanthomonas albilineans. Genes 2015, 6, 714-733.

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