Effects of UV-B radiation on Gelidium floridanum (Rhodophyta, Gelidiales): germination of tetraspores and early sporeling development |
| |
Authors: | Lidiane Ângela Scariot Ticiane Rover Carmen Simioni Zitta Paulo Antunes Horta Eurico Cabral de Oliveira Zenilda Laurita Bouzon |
| |
Institution: | 1. Department of Botany, Federal University of Santa Catarina, 88010-970, Florianópolis, Santa Catarina, Brazil 2. Macroalgae Laboratory, Department of Cell Biology, Embryology and Genetics, Federal University of Santa Catarina, 88049-900, Florianópolis, Santa Catarina, Brazil 3. Institute of Biosciences, Department of Botany, University of S?o Paulo, 05508-900, S?o Paulo, Brazil 4. Central Laboratory of Electron Microscopy, Federal University of Santa Catarina, 88049-900, Santa Catarina, Brazil
|
| |
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: | |
本文献已被 SpringerLink 等数据库收录! |
|