Article

Journal of Applied Phycology

, Volume 25, Issue 2, pp 537-544

First online:

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

  • Lidiane Ângela ScariotAffiliated withDepartment of Botany, Federal University of Santa Catarina Email author 
  • , Ticiane RoverAffiliated withMacroalgae Laboratory, Department of Cell Biology, Embryology and Genetics, Federal University of Santa Catarina
  • , Carmen Simioni ZittaAffiliated withMacroalgae Laboratory, Department of Cell Biology, Embryology and Genetics, Federal University of Santa Catarina
  • , Paulo Antunes HortaAffiliated withDepartment of Botany, Federal University of Santa Catarina
  • , Eurico Cabral de OliveiraAffiliated withDepartment of Botany, Federal University of Santa CatarinaInstitute of Biosciences, Department of Botany, University of São Paulo
  • , Zenilda Laurita BouzonAffiliated withDepartment of Botany, Federal University of Santa CatarinaMacroalgae Laboratory, Department of Cell Biology, Embryology and Genetics, Federal University of Santa CatarinaCentral Laboratory of Electron Microscopy, Federal University of Santa Catarina

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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.

Keywords

Ontogenesis Red algae Spore germination Sporelings UV-B radiation damage