Fig. 1.

Phylogenetic tree based on Rubisco large subunit protein sequences. The 12 alkaliphilic cyanobacterial strains examined in this study are identified by the blue diamond, while other reference species are represented without diamond. Cyanobacterial habitat, cell arrangement, and carboxysome type (α- or β-) are displayed. Within the column for habitat, freshwater strains are denoted by W, marine by M, and alkaline niche by A. Unicellular and filamentous cell arrangement is represented by U and F, respectively.