Publications

4862

In August 2013, potato plants (Solanum tuberosum) cv. Banba displaying symptoms resembling those caused by Candidatus Phytoplasma solani (potato stolbur phytoplasma) were observed in a 2-ha field in the area of the Peripheral Unit of Drama (northern Greece). The plants were 10 weeks old and their symptoms included reddening and upward rolling of leaflets, reduced size of leaves, shortened internodes, and aerial tuber formation. Incidence of affected plants was estimated to be 40% in the field. Four symptomatic potato plants were collected for laboratory testing of possible phytoplasma infection. From each of these four plants, total DNA was extracted from mid veins of reddish leaflets from apical shoot parts and of leaflets emerging from aerial tubers, using a phytoplasma enrichment procedure (1). A nested PCR using the phytoplasma universal 16S rRNA primer pairs: P1/P7 followed by R16F2n/R16R2 (3) amplified the expected ~1.2-kb 16S rDNA fragment in all four symptomatic potato plants. No amplification was observed with DNA similarly extracted from leaflets of asymptomatic potato plants of the same variety collected from an apparently healthy crop. One of the four 1.2-kb nested 16S rDNA PCR products was gel purified, cloned into the pGEM-T-easy plasmid vector (Promega, Madison, WI), and sequenced by Beckman Coulter Genomics (United Kingdom). At least twofold coverage per base position of the cloned PCR product was achieved. BLAST analysis showed that the obtained sequence of the PCR 16S rDNA product was: i) 100% identical to several GenBank sequences of Ca. P. solani strains, including strains detected previously in Greece infecting tomato (GenBank Accession No. JX311953) and Datura stramonium (HE598778 and HE598779), and ii) 99.7% similar to that of the Ca. P. solani reference strain STOL11 (AF248959). Furthermore, analysis by iPhyClassifier software showed that the virtual restriction fragment length polymorphism (RFLP) pattern of the sequenced PCR 16S rDNA product is identical (similarity coefficient 1.00) to the reference pattern of the 16SrXII-A subgroup (AF248959). The sequence of this PCR product was deposited in NCBI GenBank database under the accession no. KJ810575. The presence of the stolbur phytoplasma in all four symptomatic potato plants examined was further confirmed by nested PCR using the stolbur-specific STOL11 primers (3) targeting non-ribosomal DNA. Based on the observed symptoms in the field and laboratory molecular examinations, we concluded that the potato plants were infected by a Ca. P. solani related strain. The stolbur disease has been previously reported in Greece affecting tomato (2,5) and varieties of D. stramonium (4). To our knowledge, this is the first report of a Ca. P. solani related strain infecting a potato crop in Greece. As northern Greece is a center of potato production, the source of this pathogen is to be investigated. References: (1) U. Ahrens and E. Seemuller. Phytopathology 82:828, 1992. (2) A. S. Alivizatos. Pages 945-950 in: Proceedings of the 7th International Conference of Plant Pathogenic Bacteria. Academiai Kiado, Budapest, Hungary, 1989. (3) J. Jović et al. Bull. Insectol. 64:S83, 2011. (4) L. Lotos et al. J. Plant Pathol. 95:447, 2013. (5) E. Vellios and F. Lioliopoulou. Bull. Insectol. 60:157, 2007.

Abstract Magnetotactic bacteria (MTB) of the genus ‘Candidatus Magnetobacterium’ in phylum Nitrospirae are of great interest because of the formation of hundreds of bullet-shaped magnetite magnetosomes in multiple bundles of chains per cell. These bacteria are worldwide distributed in aquatic environments and have important roles in the biogeochemical cycles of iron and sulfur. However, except for a few short genomic fragments, no genome data are available for this ecologically important genus, and little is known about their metabolic capacity owing to the lack of pure cultures. Here we report the first draft genome sequence of 3.42 Mb from an uncultivated strain tentatively named ‘Ca. Magnetobacterium casensis’ isolated from Lake Miyun, China. The genome sequence indicates an autotrophic lifestyle using the Wood–Ljungdahl pathway for CO2 fixation, which has not been described in any previously known MTB or Nitrospirae organisms. Pathways involved in the denitrification, sulfur oxidation and sulfate reduction have been predicted, indicating its considerable capacity for adaptation to variable geochemical conditions and roles in local biogeochemical cycles. Moreover, we have identified a complete magnetosome gene island containing mam, mad and a set of novel genes (named as man genes) putatively responsible for the formation of bullet-shaped magnetite magnetosomes and the arrangement of multiple magnetosome chains. This first comprehensive genomic analysis sheds light on the physiology, ecology and biomineralization of the poorly understood ‘Ca. Magnetobacterium’ genus.

“Candidatus Liberibacter europaeus” (Leu) is one of six currently known Liberibacter species. It is known primarily from pear and related species across Europe, and from Scotch broom and its associated psyllids in New Zealand (introduced from Britain). The psyllids were introduced to New Zealand as a biocontrol agent for broom and it is thought the bacterium may have been introduced as an endosymbiont of the psyllids. No symptoms in apple or pear trees have been reported, but mild symptoms can occur in broom. 16S and 16S–23S intergenic spacer region DNA sequences of this species have been deposited in GenBank. Analysis of these sequences and associated ecological descriptions indicates the occurrence of two haplotypes, LeuA and LeuB, defined not only genetically but also by geographic range as well as by plant/psyllid host species composition. Liberibacter species are new to science and haplotype identifications enable historical accounts of relationships and spread to be generated.

Abstract The obligate-heritable endosymbionts of insects possess some of the smallest known bacterial genomes. This is likely due to loss of genomic material during symbiosis. The mode and rate of this erosion may change over evolutionary time: faster in newly formed associations and slower in long-established ones. The endosymbionts of human and anthropoid primate lice present a unique opportunity to study genome erosion in newly established (or young) symbionts. This is because we have a detailed phylogenetic history of these endosymbionts with divergence dates for closely related species. This allows for genome evolution to be studied in detail and rates of change to be estimated in a phylogenetic framework. Here, we sequenced the genome of the chimpanzee louse endosymbiont (Candidatus Riesia pediculischaeffi) and compared it with the closely related genome of the human body louse endosymbiont. From this comparison, we found evidence for recent genome erosion leading to gene loss in these endosymbionts. Although gene loss was detected, it was not significantly greater than in older endosymbionts from aphids and ants. Additionally, we searched for genes associated with B-vitamin synthesis in the two louse endosymbiont genomes because these endosymbionts are believed to synthesize essential B vitamins absent in the louse’s diet. All of the expected genes were present, except those involved in thiamin synthesis. We failed to find genes encoding for proteins involved in the biosynthesis of thiamin or any complete exogenous means of salvaging thiamin, suggesting there is an undescribed mechanism for the salvage of thiamin. Finally, genes encoding for the pantothenate de novo biosynthesis pathway were located on a plasmid in both taxa along with a heat shock protein. Movement of these genes onto a plasmid may be functionally and evolutionarily significant, potentially increasing production and guarding against the deleterious effects of mutation. These data add to a growing resource of obligate endosymbiont genomes and to our understanding of the rate and mode of genome erosion in obligate animal-associated bacteria. Ultimately sequencing additional louse p-endosymbiont genomes will provide a model system for studying genome evolution in obligate host associated bacteria.