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THE CORRELATION OF GOLGI ACTIVITY AND POLYSACCHARIDE SECRETION IN PORPHYRIDIUM 1 2
Author(s) -
Ramus J.,
Robins D. M.
Publication year - 1975
Publication title -
journal of phycology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.85
H-Index - 127
eISSN - 1529-8817
pISSN - 0022-3646
DOI - 10.1111/j.1529-8817.1975.tb02750.x
Subject(s) - golgi apparatus , biology , exocytosis , polysaccharide , vesicle , biogenesis , secretion , phase (matter) , stationary phase , biophysics , microbiology and biotechnology , cell , biochemistry , membrane , chromatography , chemistry , organic chemistry , gene
SUMMARY Quantitative morphometric measurements were made of the area occupied by the Golgi complex in log and stationary phase cells. The technique involved the cutting out and weighing of cellular compartments from electron micrographs of median cell sections. Data from the morphometric measurements combined with physiological measurements of secretory activity yielded a simple model for the involvement of the Golgi complex in the biogenesis of cell surface polysaccharides. Golgi were larger and more numerous in log phase, perhaps indicating a higher rate of polysaccharide synthesis than in stationary phase. In log phase, polysaccharide‐containing vesicles accumulate adjacent to the cell membrane. In stationary phase, the polysaccharide is secreted to the cell surface by exocytosis, giving rise to a capsule. Thus the shift from log to stationary phase results in structural and functional cellular differentiation, eg , from a thin to a thick capsule. The ecological implications of capsule formation are discussed.