Marine & Environmental Sciences Faculty Articles
Effects of Calcium, Strontium, and Magnesium on the Coccolithophorid Cricosphaera (Hymenomonas) carterae. II. Cell Division
Document Type
Article
Publication Title
Marine Biology
ISSN
0025-3162
Publication Date
1-20-1976
Abstract
The effects of calcium-deficiency, magnesium-deficiency and strontium enrichment on cell division in the alga Cricosphaera (Hymenomonas) carterae have been studied. Cell growth was reduced at 10-3 M Ca and was absent at 5x10-4 M Ca and lower concentrations. The addition of Sr to Ca-deficient media enabled cells to divide, the effect increasing with Sr concentration. When 4.6x10-4 M Sr was added to media containing 10-4 M Ca, the rate of division and the final cell concentration were comparable to the control (10-2 M Ca). Strontium was 20 times more effective than Ca. The rate of growth was also examined at various Mg concentrations. Cell division was absent, or nearly so, in Mg concentrations below 4.2x10-5 M. Cell size increased progressively as the Mg concentration decreased; however, the lowest protein concentration was found in the absence of Mg. In media lacking Mg, cells exhibited changes in ultrastructure including rounding-up and apparent fragmentation of chloroplasts and an increase in vacuole size. Also, the number of mitochondria per cell section increased 2.9 times in the absence of Mg while the total cross-sectional area remained the same, indicating fragmentation.
DOI
10.1007/BF00390782
Volume
34
Issue
1
First Page
17
Last Page
22
Additional Comments
U.S. Public Health Service Research grant #: DE-O1382-O6
NSUWorks Citation
R. E. Weiss, Patricia Blackwelder, and K. M. Wilbur. 1976. Effects of Calcium, Strontium, and Magnesium on the Coccolithophorid Cricosphaera (Hymenomonas) carterae. II. Cell Division .Marine Biology , (1) : 17 -22. https://nsuworks.nova.edu/occ_facarticles/433.
Comments
©Springer-Verlag 1976