Photosynthetica 2018, 56(3):799-810 | DOI: 10.1007/s11099-017-0731-2

Comparative study of the effects of salinity and UV radiation on metabolism and morphology of the red macroalga Acanthophora spicifera (Rhodophyta, Ceramiales)

D. T. Pereira1, C. Simioni1, L. C. Ouriques1, F. Ramlov2, M. Maraschin2, N. Steiner3, F. Chow4, Z. L. Bouzon1, É. C. Schmidt1,*
1 Plant Cell Biology Laboratory, Department of Cell Biology, Embryology and Genetics, Federal University of Santa Catarina, Florianópolis, SC, Brazil
2 Plant Morphogenesis and Biochemistry Laboratory, Federal University of Santa Catarina, Florianópolis, SC, Brazil
3 Plant Physiology Laboratory, Department of Botany, Federal University of Santa Catarina, Florianópolis, SC, Brazil
4 Institute of Bioscience, University of São Paulo, São Paulo, SP, Brazil

Increase of harmful radiation to the Earth's surface due to ozone depletion results in higher exposure to harmful ultraviolet- B radiation (UV), while fluctuations in seawater salinity may alter water density, ionic concentration, nutrient uptake, and osmotic pressure. This study evaluated the effects of salinity and UV on metabolism and morphology of Acanthophora spicifera (M.Vahl) Børgesen. Water with 30 and 37 psu [g(salt) kg-1(sea water)] was used for experiments during 7 d of exposure to UV (3 h per day). We demonstrated that UV treatment predisposed, irrespective of salinity, A. spicifera to a decrease in its growth rate and cell viability, as well as affected its morphological parameters. After exposure to PAR + UVA + UVB (PAB), samples showed structural changes and damage, such as increasing cell wall thickness and chloroplast disruption. Our results indicate that UV led to dramatic metabolic changes and cellular imbalances, but more remarkable changes were seen in samples exposed to high salinity.

Keywords: alga; cell viability; growth rate; metabolites; microscopy

Received: January 12, 2017; Accepted: March 19, 2017; Prepublished online: September 1, 2018; Published: August 1, 2018Show citation

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Pereira, D.T., Simioni, C., Ouriques, L.C., Ramlov, F., Maraschin, M., Steiner, N., ... Schmidt, É.C. (2018). Comparative study of the effects of salinity and UV radiation on metabolism and morphology of the red macroalga Acanthophora spicifera (Rhodophyta, Ceramiales). Photosynthetica, 56(3), 799-810. doi: 10.1007/s11099-017-0731-2.
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