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Journal of Bacteriology, September 2005, p. 6488-6498, Vol. 187, No. 18
0021-9193/05/$08.00+0 doi:10.1128/JB.187.18.6488-6498.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.
Whole-Genome Sequence Analysis of Pseudomonas syringae pv. phaseolicola 1448A Reveals Divergence among Pathovars in Genes Involved in Virulence and Transposition
Vinita Joardar,1
Magdalen Lindeberg,2
Robert W. Jackson,3
Jeremy Selengut,1
Robert Dodson,1
Lauren M. Brinkac,1
Sean C. Daugherty,1
Robert DeBoy,1
A. Scott Durkin,1
Michelle Gwinn Giglio,1
Ramana Madupu,1
William C. Nelson,1
M. J. Rosovitz,1
Steven Sullivan,1
Jonathan Crabtree,1
Todd Creasy,1
Tanja Davidsen,1
Dan H. Haft,1
Nikhat Zafar,1
Liwei Zhou,1
Rebecca Halpin,1
Tara Holley,1
Hoda Khouri,1
Tamara Feldblyum,1
Owen White,1
Claire M. Fraser,1
Arun K. Chatterjee,4
Sam Cartinhour,5
David J. Schneider,5
John Mansfield,6
Alan Collmer,2 and
C. Robin Buell1*
The Institute for Genomic Research, 9712 Medical Center Dr., Rockville, Maryland 20850,1
Department of Plant Pathology, Cornell University, Ithaca, New York 14853,2
Department of Biology and Biochemistry, University of Bath, Claverton Down, Bath, BA2 7AY United Kingdom,3
Department of Plant Microbiology and Pathology, University of Missouri, Columbia, Missouri 65211,4
U.S. Department of Agriculture Agricultural Research Service, Ithaca, New York 14853-2901,5
Division of Biology, Imperial College, Wye Campus, Wye, Ashford, Kent TN25 5AH, United Kingdom6
Received 15 April 2005/
Accepted 21 June 2005
Pseudomonas syringae pv. phaseolicola, a gram-negative bacterial plant pathogen, is the causal agent of halo blight of bean. In this study, we report on the genome sequence of P. syringae pv. phaseolicola isolate 1448A, which encodes 5,353 open reading frames (ORFs) on one circular chromosome (5,928,787 bp) and two plasmids (131,950 bp and 51,711 bp). Comparative analyses with a phylogenetically divergent pathovar, P. syringae pv. tomato DC3000, revealed a strong degree of conservation at the gene and genome levels. In total, 4,133 ORFs were identified as putative orthologs in these two pathovars using a reciprocal best-hit method, with 3,941 ORFs present in conserved, syntenic blocks. Although these two pathovars are highly similar at the physiological level, they have distinct host ranges; 1448A causes disease in beans, and DC3000 is pathogenic on tomato and Arabidopsis. Examination of the complement of ORFs encoding virulence, fitness, and survival factors revealed a substantial, but not complete, overlap between these two pathovars. Another distinguishing feature between the two pathovars is their distinctive sets of transposable elements. With access to a fifth complete pseudomonad genome sequence, we were able to identify 3,567 ORFs that likely comprise the core Pseudomonas genome and 365 ORFs that are P. syringae specific.
* Corresponding author. Mailing address: The Institute for Genomic Research, 9712 Medical Center Dr., Rockville, MD 20850. Phone: (301) 795-7558. Fax: (301) 838-0208. E-mail:
rbuell{at}tigr.org.
Supplemental material for this article may be found at http://jb.asm.org/.
Journal of Bacteriology, September 2005, p. 6488-6498, Vol. 187, No. 18
0021-9193/05/$08.00+0 doi:10.1128/JB.187.18.6488-6498.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.
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