Cellular composition and physiology of Thalassiosira fluviatilis accomodated to cadmium stress
Steady-state populations of Thalassiosira fluviatilis from continuous cultures receiving 0 and 61 ..mu..g Cd/l were harvested for determinations of cellular components and physiological responses to subsequent cadmium exposure. Compared to cadmium-free control cells, cadmium-stressed cells had elevated amounts of protein, lipid, acid-soluble carbohydrate, ATP, ADP, chlorophyll a and carotenoids but similar amounts of DNA, RNA, AMP, chlorophyll c, alkali-soluble carbohydrate and insoluble carbohydrate. Dry weight to cell volume ratio, protein to the sum of total carbohydrates and lipid ratio as well as the adenylate energy charge were not different for the two populations. Subsequent exposure of the cells to cadmium over a wide concentration range indicated maximal values of growth rate, photosynthetic C-14 incorporation and extracellular release of C-14 at the cadmium level to which the cells had been adapted in continuous culture. The adaptive and ecological significance of these results will be discussed.
- Research Organization:
- Dalhousie Univ., Halifax, Nova Scotia
- OSTI ID:
- 6660315
- Journal Information:
- J. Phycol.; (United States), Vol. 14; Conference: Phycological Society of America meeting, Athens, GA, USA, Aug 1978
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
59 BASIC BIOLOGICAL SCIENCES
ALGAE
CADMIUM
BIOLOGICAL EFFECTS
BIOCHEMISTRY
BIOLOGICAL ADAPTATION
BIOLOGICAL STRESS
CELL CONSTITUENTS
DIATOMS
GROWTH
PHOTOSYNTHESIS
PHYSIOLOGY
POPULATION DYNAMICS
BIOMASS
CHEMICAL REACTIONS
CHEMISTRY
ELEMENTS
ENERGY SOURCES
METALS
PHOTOCHEMICAL REACTIONS
PLANTS
RENEWABLE ENERGY SOURCES
SYNTHESIS
560302* - Chemicals Metabolism & Toxicology- Microorganisms- (-1987)
560303 - Chemicals Metabolism & Toxicology- Plants- (-1987)
550200 - Biochemistry