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Effects of UV-B radiation on Gelidium floridanum (Rhodophyta, Gelidiales): germination of tetraspores and early sporeling development

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Abstract

The increased incidence of UV-B radiation, particularly in southern South America, has sparked more interest in its effects on marine organisms. Here we describe the effects of UV-B on the early life stages of Gelidium floridanum, an agar-producing species abundant on rocky coasts in southern Brazil. Treated samples were submitted to 0.12 W m−2 of artificial UV-B radiation for 2 h per day over a 15-day period. UV-B exposure induced impairment of tetraspore germination and germling development. We observed a delay in germination, a reduced growth rate of tetrasporelings, and morphological changes, such as a different length-to-width ratio, twisted thallus, loss of pigmentation, and differentiation of more than one apical cell, all leading to a different growth pattern in sporelings that survived treatment. Results indicated a great susceptibility of early-developing Gelidium to UV-B, even at low irradiance and short exposure time.

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Acknowledgments

This work is part of a master’s dissertation and, therefore, the first author is grateful to “Coordenação de Aperfeiçoamento de Pessoal de Nível Superior” (CAPES) for providing a scholarship to support the study. Also the authors acknowledge the valuable consideration of both referees who kindly contributed to the improvement of this manuscript.

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Authors and Affiliations

  1. Department of Botany, Federal University of Santa Catarina, 88010-970, Florianópolis, Santa Catarina, Brazil

    Lidiane Ângela Scariot, Paulo Antunes Horta, Eurico Cabral de Oliveira & Zenilda Laurita Bouzon

  2. Macroalgae Laboratory, Department of Cell Biology, Embryology and Genetics, Federal University of Santa Catarina, 88049-900, Florianópolis, Santa Catarina, Brazil

    Ticiane Rover, Carmen Simioni Zitta & Zenilda Laurita Bouzon

  3. Institute of Biosciences, Department of Botany, University of São Paulo, 05508-900, São Paulo, Brazil

    Eurico Cabral de Oliveira

  4. Central Laboratory of Electron Microscopy, Federal University of Santa Catarina, 88049-900, Santa Catarina, Brazil

    Zenilda Laurita Bouzon

Authors
  1. Lidiane Ângela Scariot
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  2. Ticiane Rover
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  3. Carmen Simioni Zitta
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  4. Paulo Antunes Horta
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  5. Eurico Cabral de Oliveira
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  6. Zenilda Laurita Bouzon
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Correspondence to Lidiane Ângela Scariot.

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Scariot, L.Â., Rover, T., Zitta, C.S. et al. Effects of UV-B radiation on Gelidium floridanum (Rhodophyta, Gelidiales): germination of tetraspores and early sporeling development. J Appl Phycol 25, 537–544 (2013). https://doi.org/10.1007/s10811-012-9888-z

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  • DOI: https://doi.org/10.1007/s10811-012-9888-z

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