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

Luz K. Polo; Fungyi Chow

doi:10.3989/scimar.04982.22A

Autores/as

Luz K. Polo Laboratory of Marine Algae “Édison José de Paula”, Department of Botany, Institute of Biosciences, University of São Paulo https://orcid.org/0000-0002-9318-4042
Fungyi Chow Laboratory of Marine Algae “Édison José de Paula”, Department of Botany, Institute of Biosciences, University of São Paulo https://orcid.org/0000-0003-2462-3117

DOI:

https://doi.org/10.3989/scimar.04982.22A

Palabras clave:

algas, tasa de crecimiento, pigmentos fotosintéticos, proteínas, radiación ultravioleta, compuestos absorbentes de rayos UV

Resumen

La radiación UV es un factor que afecta la distribución y la fisiología de los organismos fotosintéticos en el ecosistema acuático. Los estudios con macroalgas indican diversas alteraciones biológicas en respuesta a la radiación UV. Este trabajo tuvo como objetivo estudiar la sensibilidad de la macroalga parda Sargassum filipendula expuesta a radiación UV: PAR (control), PAR + UVA + UVB (++) y PAR + UVA (++) + UVB. Los cambios en la tasa de crecimiento, proteínas solubles totales, pigmentos fotosintéticos y compuestos absorbentes de UV-vis se analizaron después de T0, T4, T7 y T10 (días) de exposición a UV. Los parámetros fisiológicos mostraron poca variación entre los tratamientos y con el tiempo, lo que sugiere que dosis moderadas de radiación UV podrían regular las respuestas de resistencia para restablecer la condición de homeostasis celular a través de la activación del sistema de defensa antioxidante, como la sobreproducción de compuestos fenólicos. Las respuestas registradas en S. filipendula estarían relacionadas con mecanismos de aclimatación contra el estrés agudo por radiación UV, desencadenando respuestas de resistencia para evitar daños severos en la maquinaria metabólica, activando sistemas de control para mantener la hormesis y homeostasis de acciones deletéreas de especies reactivas, similar al fenómeno llamado preparación para el estrés oxidativo (POS). Finalmente, los espectros de absorción UV-visible mostraron bandas de absorción que evidencian la presencia de compuestos absorbentes de UV principalmente con función fotoprotectora, como los florotaninos, flavonoides y carotenoides que podrían proporcionar ventajas adaptativas para los organismos expuestos a la radiación UV.

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