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Effect of calcium ion on cytoplasmic streaming during turgor regulation in a brackish water charophyte Lamprothamnium
Author(s) -
OKAZAKI Y.,
TAZAWA M.
Publication year - 1986
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/j.1365-3040.1986.tb01765.x
Subject(s) - turgor pressure , cytoplasmic streaming , cytoplasm , osmotic pressure , tonicity , brackish water , osmoregulation , vacuole , biophysics , calcium , biology , botany , microbiology and biotechnology , biochemistry , salinity , chemistry , ecology , organic chemistry
The brackish water charophyte Lamprothamnium succinctum regulates its turgor pressure against changes in the external osmotic pressure. Upon hypotonic treatment, the rate of cytoplasmic streaming in the internodal cells fell to almost zero, and then recovered to the original value within 20 min. The decrease could be inhibited by lowering the external Ca 2+ concentration in the hypotonic medium. Also, cytoplasmic streaming in tonoplast‐free cells of L. succintum was sensitive to Ca 2+ like freshwater charophyte. Thus, the concentration of free Ca 2+ in the cytoplasm seems to increase transiently upon hypotonic treatment.