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Effect of sulfur starvation on the morphology and ultrastructure of the cyanobacterium Gloeothece sp. PCC 6909
Authors:Xavier Ariño  Jose-Julio Ortega-Calvo  Mariona Hernandez-Marine  Cesareo Saiz-Jimenez
Institution:(1) Instituto de Recursos Naturales y Agrobiologia, C.S.I.C., Apartado 1052, E-41080 Sevilla, Spain;(2) Laboratori de Botanica, Facultat de Farmacia, Universitat de Barcelona, Avinguda Joan XXIII s/n, E-08028 Barcelona, Spain
Abstract:Gloeothece sp. PCC 6909 is a unicellular, nitrogen-fixing cyanobacterium that accumulates sulfate in its sheath. An ultrastructural study of sulfate-deficient and normal Gloeothece sp. PCC 6909 cells was carried out. The physiological alterations, caused by sulfur starvation, were related to important morphological alterations in the cell: a structureless sheath, accumulation of cyanophycin, polyhydroxybutyrate and glycogen granules, and disintegration of thylakoidal membranes. Most of these changes were reversed by the addition of sulfate to the culture medium. The important role of sulfate in the sheath structure was demonstrated.
Keywords:Sulfur starvation  Cyanobacterium  Sulfate  Sheath  Gloeothece
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