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. 2019 Feb 22;10:277. doi: 10.3389/fmicb.2019.00277

FIGURE 9.

FIGURE 9

Phylogenetic tree of cyanobacteria inferred from 260 housekeeping proteins with traced evolution of thylakoid arrangement. The tree was calculated using the maximum-likelihood method from an alignment of 148 sequences rows spanning 156,762 amino acid positions. BP values (500 repetitions) are displayed near the nodes. Numbers in parentheses represent the number of sequences in collapsed branches. Color-coded thylakoid arrangements in non-terminal nodes were inferred using the parsimony ancestral reconstruction method. Special features in thylakoid architecture are indicated with pictograms. Reconstructed convergent occurrence of the parietal arrangement is marked with a filled black circle. Selected nodes, which are referred to in the main text, are numbered to facilitate tree description. Collapsed nodes containing taxa with a single category of thylakoid arrangement together with taxa with unknown ultrastructure are color-coded according to the known category. PSC clade = Prochlorococcus, marine Synechococcus, and Cyanobium.