Sargassum stenophyllum (Fucales, Ochrophyta) responses to temperature short-term exposure: photosynthesis and chemical c
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BIOCHEMISTRY & PHYSIOLOGY - ORIGINAL ARTICLE
Sargassum stenophyllum (Fucales, Ochrophyta) responses to temperature short‑term exposure: photosynthesis and chemical composition Vanessa Urrea‑Victoria1 · Allyson E. Nardelli1 · Eny I. S. Floh2 · Fungyi Chow1 Received: 25 September 2019 / Revised: 16 July 2020 / Accepted: 28 July 2020 © Botanical Society of Sao Paulo 2020
Abstract Sargassum species form extensive benthic beds in tropical and subtropical low intertidal and subtidal zones, acting as important drivers for marine community structure. Temperature, as one of the most important abiotic factor, affects seaweed performance and triggers changes in metabolic responses; therefore, laboratory experiments involving temperature ranges are tools for understanding seaweed engineering. The aim of this study was to assess the physiological vulnerability and sensitivity of Sargassum stenophyllum C. Martius exposed to five different temperatures by analyzing photosynthetic performance and chemical composition related to carbon and nitrogen metabolism. There were no significant differences in energy quenching between treatments, except at 35 °C, which showed decreased photochemical quenching and increased non-regulated non-photochemical quenching. Chlorophyll a and chlorophyll c at 15 °C and 35 °C exhibited lower amounts at the end of experiment. Protein content showed progressive diminution in the treatments. Total soluble carbohydrates content showed higher concentration as temperature increased. After 7 days, total amino acid content showed increase from 15 °C to 30 °C. No generalization between the amino acid patterns, although glutamine and glutamate content at 15 °C and 35 °C were reduced; and the highest values of isoleucine and leucine were detected at 35 °C. We postulated that accumulation of certain chemical compounds in S. stenophyllum results from a reallocation of carbon and nitrogen, osmoregulation responses and protection against oxidative stress. Results suggest this species’ tolerance ranges between 15 °C and 30 °C and sensitivity at 35 °C. Keywords Amino acids · Brown algae · Macroalgae · Pigments · Thermal stress
1 Introduction In natural environment, seaweeds are constantly exposed to variations of both biotic (e.g., herbivory, competition) and abiotic (e.g., temperature, irradiance, UV radiation, nutrient, Electronic supplementary material The online version of this article (https://doi.org/10.1007/s40415-020-00639-y) contains supplementary material, which is available to authorized users. * Fungyi Chow [email protected] 1
Laboratory of Marine Algae “Édison José de Paula”, Institute of Biosciences, University of São Paulo, Rua do Matão 277, São Paulo CEP 05508‑090, Brazil
Plant Cell Biology Laboratory, Institute of Biosciences, University of São Paulo, Rua do Matão 277, São Paulo CEP 05508‑090, Brazil
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air exposure) factors in an air–water ecosystem interface imposed by tide-driven fluctuations. In the upper limit of intertidal zone, physical factors such as temperature, irradian
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