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The mechanical triggering of bioluminescence in marine dinoflagellates: Chemical basis

✍ Scribed by J. P. Hamman; H. H. Seliger

Publisher: John Wiley and Sons
Year: 1972
Tongue: English
Weight: 839 KB
Volume: 80
Category: Article
ISSN: 0021-9541
DOI: 10.1002/jcp.1040800310

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✦ Synopsis

In both photosynthetic (Pyrodinium bahamense, Gonyaulax polyedra, Pyrocystis lunula, P. noctiluca, P. fusijormis) and nonphotosynthetic (Noctiluca miliaris) bioluminescent dinoflagellates chemical stimulation can by-pass mechanical stimulation. The effective ions are Cat+, K+, NH4+ and H+.

Other chemicals found effective are those implicated in Ca++ transport or binding. There are interspecies differences in degrees of mechanical and chemical stimulability. Photoinhibition of mechanical stimulability is the result of two effects, the first a reduction in total bioluminescence potential and the second a decrease in mechanical stimulability resulting experimentally in a decreased rate of light emission. This latter effect can be reversed with Ca++ ions. Chemicals which bind Catt or displace Ca++ can mimic the effects of photoinhibition. The chemical inhibition of mechanical stimulability is also reversed by Ca++ions. A scheme is proposed which is consistent for all species examined.

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