Figure 1

Phylogenetic tree based on almost complete 16S rRNA gene sequences showing the position of BChl a -containing strains within the OM60/NOR5 clade. The dendrogram was reconstructed with a neighbor-joining distance matrix program as implemented in the ARB package using phylogenetic distances calculated with the algorithm of Jukes and Cantor. No filter or weighting masks were used to constrain the used positions of the alignment. In addition, trees were reconstructed using the PHYLIP maximum parsimony program of ARB and the RAxML maximum likelihood program. Bootstrap values (as percentages of 1000 resamplings) are shown in front of each node, if at least with one reconstruction method a value of 80% or above was obtained. From left to right the numbers indicate results of the neighbor-joining, maximum parsimony and maximum likelihood analyses. A hyphen indicates that the branch was not obtained with the respective reconstruction method. Nucleotide sequence accession numbers are given in parentheses. The affiliation of strains to subclades of the OM60/NOR5 group is based on [13]. The sequence of Alcanivorax borkumensis [GenBank:Y12579] was used as outgroup (not shown). Designations given in red color indicate that the respective strains produce BChl a and/or encode genes for a photosynthetic apparatus; names in blue indicate the presence of proteorhodopsin encoding genes. Strains that were tested with specific PCR primers for the presence of pufLM and soxB genes are labeled with red and yellow circles, respectively. Closed circles indicate a positive PCR reaction and open circles a negative reaction. The bar represents an estimated sequence divergence of 5%.