ISSN:
1432-072X
Keywords:
Cyanobacteria
;
Salt tolerance
;
Plasma membrane
;
Aphanothece halophytica
;
Lipid composition
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
Notes:
Abstract The plasma membrane from Aphanothece halophytica was isolated using both glycerol and sucrose gradient centrifugation. The isolated membrane was characterized for lipid content by TLC and isolated lipids were quantified by chemical analysis. The plasma membrane of A. halophytica was composed of MGDG, DGDG and PG. The sulfur containing lipid SQDG was not detected. The mole percent of each lipid in the plasma membrane varied with the external salinity of the media. MGDG was the most abundant lipid in the plasma membrane of cells grown at one molar external NaCl. At three molar external NaCl, PG was the most abundant lipid. The ratio of uncharged to charged lipids comprising the plasma membrane decreased as the external salinity increased. It is possible that the alteration in lipid composition is of major importance in the adaptation of A. halophytica to changing external salinity.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00288590
Permalink
