Genome comparison of the epiphytic bacteria Erwinia billingiae and E. tasmaniensis with the pear pathogen E. pyrifoliae

Table 1 Chromosome features for the genomes of E. pyrifoliae strain Ep1/96, E. tasmaniensis strain Et1/99 and E. billingiae strain Eb661.

Strain	Ep1/96	Et1/99	Eb661
Size (bp)	4,026,322	3,883,467	5,100,168
Seq. coverage	34*¹	11	19*²
G+C content (%)	53.4	53.7	55.2
Protein coding (%)	84.9	85.0	87.7
Coding sequences	3,645	3,427	4,587
Average size (bp)	938	964	975
G+C content (%)	54.6	54.9	56.3
Assigned function	2,846	2,676	3,768
Conserved uncharacterized	549	389	515
Uncharacterized	250	362	304
Transposases	90	25	10
assigned as pseudo	57	57	13
rRNA operons	7	7	7
tRNAs	75	81	77
extrachromosomal elements	4	5	2

Sequencing coverage was reached by a 9fold Sanger sequencing and a 25fold coverage with GS20 data for strain Ep1/96 and by a 11fold Sanger sequencing and a 8fold coverage with GS FLX data for strain Eb661.
rRNA operons show 16S-23S-5S order, except one copy within the chromosome of the strains Ep1/96, Ea273 and Et1/99 with the unusual 16S-23S-5S-5S order organization. The 16S-23S-5S-5S operon is missing in strain Eb661, which belongs to a different phylogenetic branch.

ISSN: 1471-2164