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

Autor(es)

Polo, Luz K. ^[1] ; Chow, Fungyi ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Lab Marine Algae Edison Jose de Paula, Dept Bot, Inst Biosci, BR-05508090 Sao Paulo, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Scientia Marina; v. 84, n. 1, p. 59-70, MAR 2020.
• Citações Web of Science: 0

Resumo

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)

• Processo FAPESP: 16/03095-0 - Respostas fisiológicas, bioatividade e análises de expressão diferencial de proteínas da alga parda Sargassum sp. C. Agardh (Phaeophyceae, Fucales) submetida a radiação UV
• Beneficiário: Luz Karime Polo Osorio
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 13/50731-1 - Biodiversidade fisiológica e química de macroalgas ecológica e economicamente importantes
• Beneficiário: Fanly Fungyi Chow Ho
• Modalidade de apoio: Auxílio à Pesquisa - Programa BIOTA - Regular