| isolation and characterisation of the lipopolysaccharide from xanthomonas hortorum pv. vitians. | xanthomonas hortorum pv. vitians is a gram-negative bacterium that acts as the causative agent of bacterial leaf spot and headrot in lettuce. the lipopolysaccharide (lps) of this bacterium is suspected to be an important molecule for adhesion to the plants. we have isolated the lps, prepared the lipid a and the polysaccharide moieties thereof, and characterised all preparations by compositional analysis. main sugar components are rhamnose and 3-acetamido-3,6-dideoxy-galactose which presumably fu ... | 1999 | 10564788 |
| phylogenetic analysis of xanthomonas species based upon 16s-23s rdna intergenic spacer sequences. | phylogenetic relationships of 17 species of xanthomonas were assessed based on analysis of 16s-23s rdna intergenic spacer (its) sequences; a higher level of resolution was obtained than that revealed by 16s rdna analysis. its sequences varied in size from 492 to 578 nt within the genus and the similarity among sequences ranged from 63 to 99%. major differences were found for the hyacinthi group, which included xanthomonas albilineans, xanthomonas hyacinthi, xanthomonas sacchari, xanthomonas thei ... | 2002 | 11931143 |
| broad-spectrum disease resistance to necrotrophic and biotrophic pathogens in transgenic carrots (daucus carota l.) expressing an arabidopsis npr1 gene. | the development of transgenic plants highly resistant to a range of pathogens using traditional signal gene expression strategies has been largely ineffective. modification of systemic acquired resistance (sar) through the overexpression of a controlling gene such as npr1 (non-expressor of pr genes) offers an attractive alternative for augmenting the plants innate defense system. the arabidopsis (at) npr1 gene was successfully introduced into 'nantes coreless' carrot under control of a camv 35s ... | 2009 | 19859731 |
| virulence and in planta movement of xanthomonas hortorum pv. pelargonii are affected by the diffusible signal factor (dsf)-dependent quorum sensing system. | xanthomonas hortorum pv. pelargonii (xhp), the causal agent of bacterial blight in pelargonium, is the most threatening bacterial disease of this ornamental worldwide. to gain an insight into the regulation of virulence in xhp, we have disrupted the quorum sensing (qs) genes, which mediate the biosynthesis and sensing of the diffusible signal factor (dsf). mutations in rpff (encoding the dsf synthase) and rpfc (encoding the histidine sensor kinase of the two-component system rfpc/rpfg) and overe ... | 2015 | 25530086 |
| genome sequencing and comparative analysis of the carrot bacterial blight pathogen, xanthomonas hortorum pv. carotae m081, for insights into pathogenicity and applications in molecular diagnostics. | xanthomonas hortorum pv. carotae (xhc) is an economically important pathogen of carrots. its ability to epiphytically colonize foliar surfaces and infect seeds can result in bacterial blight of carrots when grown in warm and humid regions. we used high-throughput sequencing to determine the genome sequence of isolate m081 of xhc. the short reads were de novo assembled and the resulting contigs were ordered using a syntenic reference genome sequence from x. campestris pv. campestris atcc 33913. t ... | 2011 | 21722296 |
| integron variability in xanthomonas arboricola pv. juglandis and xanthomonas arboricola pv. pruni strains. | the integron platform and the gene cassette arrays of 34 xanthomonas arboricola pv. juglandis and of 47 xanthomonas arboricola pv. pruni strains isolated from different geographical areas were screened to check their variability. genetic variability of the strains was also tested by means of box-pcr. for two representative strains of the two pathovars, the integrase gene inti and part of the flanking gene ilvd were also cloned and sequenced. whereas x. a. pv. pruni strains did not show relevant ... | 2008 | 18785932 |