Effects of nutrient supply on photosynthesis and pigmentation in Ulva lactuca (Chlorophyta): responses to short-term stress
| Autor: | Amir Neori, Sven Inken, Erik-jan Malta, Félix L. Figueroa, Alvaro Israel, Brezo Martínez, Nathalie Korbee, Put O. Ang, Ronny Marquardt |
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| Jazyk: | angličtina |
| Rok vydání: | 2009 |
| Předmět: |
Ultraviolet radiation
Inorganic carbon Red macroalgae Asparagopsis armata Chlorophyta Aquatic Science Oceanography Photosynthesis Acclimatization Uv-B radiation Nutrient Algae Pigment accumulation Botany Solar radiation Aquatic plants Chlorophyll fluorescence Ecology Evolution Behavior and Systematics Ecology biology Fishpond effluents biology.organism_classification Horticulture Amino acids Ulva lactuca Marine macroalgae |
| Zdroj: | Repositório Científico de Acesso Aberto de Portugal Repositório Científico de Acesso Aberto de Portugal (RCAAP) instacron:RCAAP |
| Popis: | The effects of nutrient supply on photosynthesis (estimated as chlorophyll fluorescence), chlorophyll content, biomass yield and proximate chemical composition of tank cultivated Ulva lactuca L. (Chlorophyta) were evaluated. To assess the effect of nutrient supply on resistance capacity against short-term stress, algae grown in high nutrient supply (FINS) fishpond effluents and in low nutrient supply (LNS) oligotrophic seawater were transferred to small vessels with increased irradiance of PAR and UV radiation (PAR+UVA and PAR+UVA+UVB using cut-off filters) and increased temperature as compared to culture tanks. Electron transport rate and chlorophyll content were higher in HNS than in LNS algae. Effective quantum yield and chlorophyll content decreased after short-term exposure to high PAR irradiance. Full recovery of photosynthesis in the shade was observed under a moderately higher temperature (Delta+6 degrees C). UVB exposure reduced the negative effect of UVA on photosynthesis and pigment accumulation under temperature stress (Delta+10 degrees C), particularly in FINS algae. Growth under HNS appeared to accelerate acclimation of Ulva lactuca to short-term environmental changes, such as higher temperatures (as in heat waves) and higher UV radiation. Furthermore, nitrogen enrichment reduced the common inhibitory effects of short-term stress such as increased irradiance, UV radiation and temperature on photosynthesis. |
| Databáze: | OpenAIRE |
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