| Autor: |
S. Wiegman, Michiel H. S. Kraak, C. Barranguet, Wim Admiraal, Elly Spijkerman |
| Přispěvatelé: |
Aquatic Environmental Ecology (IBED, FNWI) |
| Rok vydání: |
2003 |
| Předmět: |
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| Zdroj: |
Environmental Toxicology and Chemistry, 22(3), 591-598. Wiley-Blackwell |
| ISSN: |
0730-7268 |
| Popis: |
Cultures of the marine diatom Phaeodactylum tricornutum were grown under laboratory light with a different fraction of ultraviolet radiation (UV) to study the potential role of photoadaptation in determining the sensitivity to photoenhanced toxicity of acridine. In short-term experiments, a higher acridine concentration was needed to inhibit the photosynthetic electron flux, monitored with chlorophyll a fluorescence, in algae exposed to fluorescent light (low UV) than to mercury light (high UV), consistent with the expected role of UV. The two types of light in long-term exposures led to changes in the pigment composition and photosystem I (PS I) to photosystem II (PS II) stoichiometry to optimize the utilization of fluorescent and mercury light. Despite the adaptation of the photosynthetic apparatus to a small fraction of UV, long-term exposure to mercury light did show a constant sensitivity of the photosynthetic efficiency of P. tricornutum to the phototoxic acridine. It is concluded that the prime receptor of photoenhanced toxicity may be unrelated to the photosynthetic machinery. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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