Environmental Stress Tolerance and Antioxidant Response ofPalisadaperforata(Rhodophyta) from a Tropical Reef1
| Autor: | Daniela Maria do Amaral Ferraz Navarro, Edson Regis Tavares Pessoa Pinho de Vasconcelos, Fungyi Chow, Vanessa Urrea-Victoria, Adilma de Lourdes Montenegro Cocentino, Juliane B. Vasconcelos, Patrícia S. Bezerra, Mutue T. Fujii |
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| Rok vydání: | 2021 |
| Předmět: |
0106 biological sciences
geography Photoinhibition geography.geographical_feature_category biology 010604 marine biology & hydrobiology Intertidal zone Plant Science Aquatic Science biology.organism_classification 010603 evolutionary biology 01 natural sciences Salinity Algae Botany Desiccation Reef Chlorophyll fluorescence Tide pool |
| Zdroj: | Journal of Phycology. 57:1045-1058 |
| ISSN: | 1529-8817 0022-3646 |
| Popis: | In this study, we analyzed the antioxidant activity and total phenolic content of the intertidal seaweed Palisada perforata collected from different reef microhabitats (sheltered site, tide pool, plateau, and exposed site) along the coast of Pernambuco (Brazil). Both parameters were compared with the same parameters of this species grown in the laboratory under two experiments simulating temperature, salinity, and desiccation conditions found in the reef. After both experiments (temperature x salinity and desiccation), the algal photosynthetic performance was measured through chlorophyll fluorescence parameters using a pulse-amplitude modulation fluorometer to test their stress response. Palisada perforata likely underwent stress by desiccation due to tidal fluctuations rather than to temperature or salinity changes. This conclusion agrees with our observations of the plateau site´s specimens, which were exposed to both air and UV radiation during low tides and exhibited higher antioxidant activity to avoid oxidative damage. However, despite the environmental stress, the antioxidant activity remained low, suggesting that photoinhibition is a crucial protection mechanism against oxidative damage. |
| Databáze: | OpenAIRE |
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