Role of silicon in diatom metabolism |
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Authors: | Lesley J Borowitzka Benjamin E Volcani |
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Institution: | (1) Scripps Institution of Oceanography, University of California, San Diego, 92093 La Jolla, CA, USA;(2) Present address: Roche Institute of Marine Pharmacology, P.O. Box 255, 2099 Dee Why, Australia |
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Abstract: | Levels of the cyclic nucleotides, cAMP and cGMP, were determined in four species of pennate diatoms; changes in their levels and ratios were monitored in silicon-starved and light-dark synchronized cultures of Cylindrotheca fusiformis. Content of both cAMP and cGMP changed during the cell cycles: when silicate was added to starved cultures, cAMP, cGMP and DNA levels rose rapidly; cAMP and cGMP declined before DNA synthesis was complete and continued to fall during the events leading to cell separation. In unstarved synchronies, net synthesis of DNA continued until cell separation; 1 h before cell separation cAMP levels fell while those of cGMP rose. The results support the proposal that cAMP and cGMP may play a part in the process of cell division in the diatom, possibly involving silicon. |
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Keywords: | Diatom Cylindrotheca fusiformis cAMP cGMP Silicon Synchrony |
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