The Control of Sea Urchin Metamorphosis: Ionic Effects. (potassium/calcium/magnesium/microbial films)
| Autor: | R. Andrew Cameron, Thomas R. Tosteson, Valentine Hensley |
|---|---|
| Rok vydání: | 1989 |
| Předmět: |
chemistry.chemical_classification
Larva biology Ecology Magnesium Potassium media_common.quotation_subject chemistry.chemical_element Cell Biology Calcium biology.organism_classification Divalent chemistry biology.animal Biophysics Metamorphosis Sea urchin Developmental Biology Lytechinus variegatus media_common |
| Zdroj: | Development, Growth and Differentiation. 31:589-594 |
| ISSN: | 1440-169X 0012-1592 |
| DOI: | 10.1111/j.1440-169x.1989.00589.x |
| Popis: | Because the cascade of events which comprise sea urchin metamorphosis occur rapidly, regulatory mechanisms able to respond in minutes must function. Employing sea water solutions of altered ionic composition in the presence or absence of metamorphically active microbial films, we tested the ability of particular ions to inhibit or enhance metamorphosis in competent larvae of the sea urchin, Lytechinus variegatus. At 40 mM excess potassium maximally induces normal metamorphosis in the absence of a microbial film. In the presence of metamorphically active microbial films, 40 mM excess magnesium inhibits the process. Increasing concentrations of calcium up to an excess of 40 mM stimulates larvae to undergo metamorphosis but in smaller proportions than similar concentrations of potassium. Divalent cation-free sea water solutions are toxic to larvae. These studies support the hypothesis that ion fluxes are involved in the regulation of metamorphosis and reveal a complexity of response that parallels the histological complexity of competent echinoid larvae. |
| Databáze: | OpenAIRE |
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