The Primitive Thylakoid-Less Cyanobacterium Gloeobacter Is a Common Rock-Dwelling Organism
Figure 4
Comparison of cell ultrastructure in Aphanothece caldariorum-like strains and Gloeobacter violaceus.
Typical cell ultrastructure of G. violaceus PCC 9601(A), G. violaceus CCALA 979 (B), A. caldariorum-like strain CCALA 981(C) and A. caldariorum-like strain CCALA 980 (D), respectively. Cells did not contain any thylakoid, the photosynthetic pigments accumulated in an electron-dense layer near the multi-layered cell wall. Cells typically contained two large polyphosphate granules in polar positions. Observed ultrastructure was identical to the reference strain G. violaceus PCC 7421 [6]. Scale bars, 500 nm.