Effect of nutrient supply on photosynthesis and pigmentation to short-term stress (UV radiation) in Gracilaria conferta (Rhodophyta)
| Autor: | Brezo Martínez, Alvaro Israel, Roberto Abdala, Ronny Marquardt, Sven Inken, Félix L. Figueroa, Nathalie Korbee, Erik-jan Malta, A Put, Amir Neori |
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| Rok vydání: | 2010 |
| Předmět: |
Chlorophyll
Nitrogen Ultraviolet Rays Aquatic Science Biology Oceanography Photosynthesis Fluorescence Pigment Nutrient Algae Stress Physiological Aquatic plant Phytoplankton Botany Gracilaria Seawater Amino Acids Temperature biology.organism_classification Pollution Carbon Thallus Photosynthetically active radiation visual_art visual_art.visual_art_medium |
| Zdroj: | Marine Pollution Bulletin. 60:1768-1778 |
| ISSN: | 0025-326X |
| Popis: | The effects of increased photosynthetic active radiation (PAR), UV radiation (UVR), and nutrient supply on photosynthetic activity, pigment content, C:N ratio and biomass yield were studied in tank cultivated Gracilaria conferta (Rhodophyta). Electron transport rate (ETR) and biliprotein content were higher under high nutrient supply (HNS), obtained from fishpond effluents, compared to low nutrient supply (LNS), in contrast to mycosporine-like amino acids (MAAs) dynamic. The high MAA content in LNS-algae could be explained by higher UVR penetration in the thallus and by the competition for the use of nutrients with other processes. Effective quantum yield decreased after short-term exposure to high irradiance whereas full recovery in shade was produced only under slightly heat shock. UVA radiation provoked an additional decrease in photosynthesis under high water temperature. UVB radiation reversed UVA's negative effect mainly with HNS. Results support that nutrient-sufficiency help G. conferta to resist environmental changes as short-term temperature increase. |
| Databáze: | OpenAIRE |
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