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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Physiological performance by growth rate, pigment and protein content of the brown seaweed Sargassum filipendula (Ochrophyta: Fucales) induced by moderate UV radiation exposure in the laboratory

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Polo, Luz K. [1] ; Chow, Fungyi [1]
Total Authors: 2
[1] Univ Sao Paulo, Lab Marine Algae Edison Jose de Paula, Dept Bot, Inst Biosci, BR-05508090 Sao Paulo, SP - Brazil
Total Affiliations: 1
Document type: Journal article
Source: Scientia Marina; v. 84, n. 1, p. 59-70, MAR 2020.
Web of Science Citations: 0

UV radiation is a factor affecting the distribution and physiology of photosynthetic organisms in an aquatic ecosystem. Studies with macroalgae indicate diverse biological disturbances in response to UV radiation. This work aimed to study sensitivity of the brown macroalga Sargassum filipendula exposed to UV radiation: PAR (control), PAR+UVA+UVB(++) and PAR+UVA(++)+UVB. Changes in the physiological parameters growth rate, total soluble proteins, photosynthetic pigments and the UV-vis absorbing compounds were analysed after TO, T4, T7 and T10 (days) of UV exposure. Physiological parameters showed little variation between treatments and over time, suggesting that moderate UV radiation doses could regulate resistance responses to re-establish the cellular homoeostasis condition through activation of an antioxidant defence system, such as an overproduction of phenolic compounds. Responses recorded in S. filipendula would be related to acclimation mechanisms against acute UV radiation stress, triggering resistance responses to avoid serious damage to the metabolic machinery, activating control systems to maintain hormesis, and homoeostasis of deleterious actions of reactive species, similar to the phenomenon known as preparation for oxidative stress. Finally, UV-visible absorption spectra showed absorption bands evidencing the presence of mainly UV-absorbing compounds with photoprotective function, such as phlorotannins, flavonoids and carotenoids, which could provide adaptive advantages for organisms exposed to UV radiation. (AU)

FAPESP's process: 16/03095-0 - Physiological responses, bioactivity and analysis of protein differential expression of the brown alga Sargassum sp. C. Agardh (Phaeophyceae, Fucales) submitted to UV radiation
Grantee:Luz Karime Polo Osorio
Support type: Scholarships in Brazil - Doctorate
FAPESP's process: 13/50731-1 - Physiological and chemical biodiversity of macroalgae ecologically and economically important
Grantee:Fanly Fungyi Chow Ho
Support type: BIOTA-FAPESP Program - Regular Research Grants