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Thylakoid centers: Structures associated with the cyanobacterial photosynthetic membrane system
Authors:Dennis D. Kunkel
Affiliation:(1) Department of Botany, University of Washington, 98195 Seattle, Washington, USA
Abstract:An ultrastructural study of four cyanobacteria (Anabaena cylindrica, Dermocarpa violaceae, Gleocapsa alpicola, Pleurocapsa minor) indicates the presence of previously undescribed thylakoid centers from which photosynthetic membranes (thylakoids) radiate. These peripherally located thylakoid centers are cylinders 30 nm wide by 320 nm long, consisting of globular subunits oriented in nonparallel stacked arrays. Thylakoids are attached to the outer surface of the cylinder along its longitudinal axis. Thylakoid centers appear to be functionally significant due to their structure, location and thylakoid association.
Keywords:Cyanobacteria  Thylakoid centers  Photosynthetic membranes/thylakoids  Membranes  Membrane biogenesis  Electron microscopy
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