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Cytological evidence for cytoplasmic volume control in Platymonas subcordiformis after osmotic stress
Author(s) -
KIRST G. O.,
KRAMER D.
Publication year - 1981
Publication title -
plant, cell and environment
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.646
H-Index - 200
eISSN - 1365-3040
pISSN - 0140-7791
DOI - 10.1111/1365-3040.ep11604669
Subject(s) - osmotic shock , thylakoid , cytoplasm , vesicle , biophysics , vacuole , chloroplast , golgi apparatus , osmotic pressure , biology , cell wall , chemistry , botany , cell , microbiology and biotechnology , biochemistry , membrane , gene
. Platymonas subcordiformis , a marine phytoplankton flagellate, shows partial control of cell volume in response to osmotic stress. Electron micrographs of samples taken at short intervals after application of a hypo‐osmotic stress revealed that a large vacuolar system is formed by fusion of vesicles originating from the Golgi apparatus. The chloroplast is swollen and the thylakoid stacking is transiently disturbed for 1 to 5 min after the osmotic shock. It then regains the original size and stacked organization of the thylakoids, while the vacuoles remain permanently. It is assumed that mainly the cytoplasmic compartment is under volume control rather than the whole cell, as has been found in other wall‐less micro‐algae.