Osmoregulation in themarine diatom Cylindrotheca fusiformis
Journal Article
·
· J. Phycol.; (United States)
A mechanism for the regulation of internal osmolarity in the diatoms (Bacillariophyta) was investigated using the intertidal/estuarian pennate diatom, Cylindrotheca fusiformis Reimann and Lewin. The intracellular pools of the free sugar, mannose, and its respective polymer, polymannose, were found to be in a dynamic equilibrium which rapidly responds to changes in external osmotic pressure. Increasing the salinity shifts the steady state in the direction of free mannose, while decreasing the salinity stimulates polymerization of the free mannose to its polysaccharide. The mechanism requires a response of certain key enzymes to osmotic pressure rather than to levels of any particular ion since increasing the external osmolarity with an organic solute (sorbital) was as effective in eliciting a response as using inorganic ions.
- Research Organization:
- Univ. of California, Berkeley
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 5537398
- Journal Information:
- J. Phycol.; (United States), Journal Name: J. Phycol.; (United States) Vol. 15:3; ISSN JPYLA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
550201 -- Biochemistry-- Tracer Techniques
550701* -- Microbiology-- Tracer Techniques
59 BASIC BIOLOGICAL SCIENCES
ALDEHYDES
ALGAE
BIOLOGICAL EFFECTS
BIOLOGICAL STRESS
CARBOHYDRATES
CARBON 14 COMPOUNDS
CONTROL
DATA
DATA FORMS
DIATOMS
ELECTROMAGNETIC RADIATION
ENZYMES
EXPERIMENTAL DATA
HEXOSES
INFORMATION
ISOLATED VALUES
ISOTOPE APPLICATIONS
LABELLED COMPOUNDS
MANNOSE
MEMBRANE TRANSPORT
MONOSACCHARIDES
NUMERICAL DATA
ORGANIC COMPOUNDS
OSMOSIS
PLANTS
POLYSACCHARIDES
PRESSURE CONTROL
RADIATIONS
RESPONSE MODIFYING FACTORS
SACCHARIDES
SALINITY
SORBITOL
TIME DEPENDENCE
TRACER TECHNIQUES
VISIBLE RADIATION
550701* -- Microbiology-- Tracer Techniques
59 BASIC BIOLOGICAL SCIENCES
ALDEHYDES
ALGAE
BIOLOGICAL EFFECTS
BIOLOGICAL STRESS
CARBOHYDRATES
CARBON 14 COMPOUNDS
CONTROL
DATA
DATA FORMS
DIATOMS
ELECTROMAGNETIC RADIATION
ENZYMES
EXPERIMENTAL DATA
HEXOSES
INFORMATION
ISOLATED VALUES
ISOTOPE APPLICATIONS
LABELLED COMPOUNDS
MANNOSE
MEMBRANE TRANSPORT
MONOSACCHARIDES
NUMERICAL DATA
ORGANIC COMPOUNDS
OSMOSIS
PLANTS
POLYSACCHARIDES
PRESSURE CONTROL
RADIATIONS
RESPONSE MODIFYING FACTORS
SACCHARIDES
SALINITY
SORBITOL
TIME DEPENDENCE
TRACER TECHNIQUES
VISIBLE RADIATION