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Heatwave Effects on the Photosynthesis and Antioxidant Activity of the Seagrass Cymodocea nodosa under Contrasting Light Regimes

Centre of Marine Sciences (CCMAR), University of Algarve, Campus Gambelas, 8005-139 Faro, Portugal
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Author to whom correspondence should be addressed.
These authors contributed equally to this work.
Academic Editor: Bernardo Duarte
Received: 10 March 2021 / Revised: 11 June 2021 / Accepted: 15 June 2021 / Published: 25 June 2021
(This article belongs to the Special Issue Seagrass Ecosystems in a Changing World)
Global climate change, specifically the intensification of marine heatwaves, affect seagrasses. In the Ria Formosa, saturating light intensities may aggravate heatwave effects on seagrasses, particularly during low spring tides. However, the photophysiological and antioxidant responses of seagrasses to such extreme events are poorly known. Here, we evaluated the responses of Cymodocea nodosa exposed at 20 °C and 40 °C and 150 and 450 μmol quanta m−2 s−1. After four-days, we analyzed (a) photosynthetic responses to irradiance, maximum photochemical efficiency (Fv/Fm), the effective quantum yield of photosystem II (ɸPSII); (b) soluble sugars and starch; (c) photosynthetic pigments; (d) antioxidant responses (ascorbate peroxidase, APX; oxygen radical absorbance capacity, ORAC, and antioxidant capacity, TEAC); (d) oxidative damage (malondialdehyde, MDA). After four days at 40 °C, C. nodosa showed relevant changes in photosynthetic pigments, independent of light intensity. Increased TEAC and APX indicated an “investment” in the control of reactive oxygen species levels. Dark respiration and starch concentration increased, but soluble sugar concentrations were not affected, suggesting higher CO2 assimilation. Our results show that C. nodosa adjusts its photophysiological processes to successfully handle thermal stress, even under saturating light, and draws a promising perspective for C. nodosa resilience under climate change scenarios. View Full-Text
Keywords: seagrasses; antioxidant response; heat haves; high temperature; Cymodocea nodosa; oxidative stress seagrasses; antioxidant response; heat haves; high temperature; Cymodocea nodosa; oxidative stress
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MDPI and ACS Style

Costa, M.M.; Silva, J.; Barrote, I.; Santos, R. Heatwave Effects on the Photosynthesis and Antioxidant Activity of the Seagrass Cymodocea nodosa under Contrasting Light Regimes. Oceans 2021, 2, 448-460. https://0-doi-org.brum.beds.ac.uk/10.3390/oceans2030025

AMA Style

Costa MM, Silva J, Barrote I, Santos R. Heatwave Effects on the Photosynthesis and Antioxidant Activity of the Seagrass Cymodocea nodosa under Contrasting Light Regimes. Oceans. 2021; 2(3):448-460. https://0-doi-org.brum.beds.ac.uk/10.3390/oceans2030025

Chicago/Turabian Style

Costa, Monya M., João Silva, Isabel Barrote, and Rui Santos. 2021. "Heatwave Effects on the Photosynthesis and Antioxidant Activity of the Seagrass Cymodocea nodosa under Contrasting Light Regimes" Oceans 2, no. 3: 448-460. https://0-doi-org.brum.beds.ac.uk/10.3390/oceans2030025

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