Fig 1.

Phylogenetic tree, GC contents, and triplet sequences from D1 protein motifs of a partial psbA gene from the culture representatives of cyanophages, cyanobacteria, and eukaryotic microalgae and from the environmental samples of this study and others (36–41). A Bayesian phylogenetic tree was constructed based on the alignment of 611 homologous nucleotides of the psbA gene. Values at nodes as shown on the main branches are the Bayesian inference (BI) posterior probability and the maximum likelihood (ML) bootstrap value in the order of BI/ML. With the clade support value of both BI and ML of ≥90%, the sequences of Lake Annecy and Bourget are grouped into black triangles. The number of sequences is given in parentheses and written in bold.