Article

The complete genome sequence of Xanthomonas albilineans provides new insights into the reductive genome evolution of the xylem-limited Xanthomonadaceae

CIRAD, UMR 385 BGPI, Campus international de Baillarguet, Montpellier, France.
BMC Genomics (Impact Factor: 4.04). 12/2009; 10:616. DOI: 10.1186/1471-2164-10-616
Source: PubMed

ABSTRACT The Xanthomonadaceae family contains two xylem-limited plant pathogenic bacterial species, Xanthomonas albilineans and Xylella fastidiosa. X. fastidiosa was the first completely sequenced plant pathogen. It is insect-vectored, has a reduced genome and does not possess hrp genes which encode a Type III secretion system found in most plant pathogenic bacteria. X. fastidiosa was excluded from the Xanthomonas group based on phylogenetic analyses with rRNA sequences.
The complete genome of X. albilineans was sequenced and annotated. X. albilineans, which is not known to be insect-vectored, also has a reduced genome and does not possess hrp genes. Phylogenetic analysis using X. albilineans genomic sequences showed that X. fastidiosa belongs to the Xanthomonas group. Order of divergence of the Xanthomonadaceae revealed that X. albilineans and X. fastidiosa experienced a convergent reductive genome evolution during their descent from the progenitor of the Xanthomonas genus. Reductive genome evolutions of the two xylem-limited Xanthomonadaceae were compared in light of their genome characteristics and those of obligate animal symbionts and pathogens.
The two xylem-limited Xanthomonadaceae, during their descent from a common ancestral parent, experienced a convergent reductive genome evolution. Adaptation to the nutrient-poor xylem elements and to the cloistered environmental niche of xylem vessels probably favoured this convergent evolution. However, genome characteristics of X. albilineans differ from those of X. fastidiosa and obligate animal symbionts and pathogens, indicating that a distinctive process was responsible for the reductive genome evolution in this pathogen. The possible role in genome reduction of the unique toxin albicidin, produced by X. albilineans, is discussed.

0 Bookmarks
 · 
175 Views
  • [Show abstract] [Hide abstract]
    ABSTRACT: Forced by tides and waves, large volumes of seawater are flushed through the beach daily. Organic material and nutrients in seawater are remineralized and cycled as they pass through the beach. Microorganisms are responsible for most of the biogeochemical cycling in the beach, however, few studies have characterized their diversity in intertidal sands, and little work has characterized the extent to which microbes are transported between different compartments of the beach. The present study uses next generation massively parallel sequencing to characterize the microbial community present at 49 beaches along the coast of California. In addition, we characterize the transport of microorganisms within intertidal sands using laboratory column experiments. We identified extensive diversity in the beach sands. Nearly 1000 unique taxa were identified in sands from 10 or more unique beaches suggesting the existence of a group of 'cosmopolitan' sand microorganisms. A biogeographical analysis identified a taxa-distance relationship among the beaches. In addition, sands with similar grain size, organic carbon content, exposed to a similar wave climate, and having the same degree of anthropogenic influence tended to have similar microbial communities. Column experiments identified microbes readily mobilized by seawater infiltrating through unsaturated intertidal sands. The ease with which microbes were mobilized suggests intertidal sands may represent a reservoir of bacteria that seed the beach aquifer where they may partake in biogeochemical cycling.
    Applied and Environmental Microbiology 04/2014; 80(13). DOI:10.1128/AEM.00513-14 · 3.95 Impact Factor
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: 5(5): . mBio . -Acetylglucosamine during Infection N Exploits campestris pv. Xanthomonas campestris The Plant Pathogen 2014. Alice Boulanger, Claudine Zischek, Martine Lautier, et al. -Acetylglucosamine during Infection N Exploits campestris pv. campestris Xanthomonas The Plant Pathogen http://mbio.asm.org/content/5/5/e01527-14.full.html Updated information and services can be found at: MATERIAL SUPPLEMENTAL http://mbio.asm.org/content/5/5/e01527-14.full.html#SUPPLEMENTAL
    mBio 09/2014; 5(5). DOI:10.1128/mBio.01527-14 · 6.88 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: Bacterial Blight is an important disease of cassava, causing losses that have resulted in historical famines in certain growing zones. The disease is caused by Xanthomonas axonopodis pv. manihotis, a gram-negative rod that belongs to the gammaproteobacteria. In this review, we describe the pathosystem and the recent studies that have been undertaken to elucidate both susceptibility and resistance mechanisms in cassava, with the hope of generating resistant plants using biotechnology. We first describe studies of the pathogen, including pathogen population changes through time as well as genomic tools that have recently been generated to determine pathogenicity factors. Secondly, we discuss mechanisms of disease resistance that have been elucidated in recent years and how these mechanisms could be used for the generation of improved plants resistant to CBB.
    Tropical Plant Biology 03/2012; 5(1). DOI:10.1007/s12042-011-9092-3

Full-text (8 Sources)

Download
98 Downloads
Available from
May 21, 2014

View other sources