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Marine Biology

, Volume 151, Issue 5, pp 1751–1759 | Cite as

Effects of solar UV radiation on germination of conchospores and morphogenesis of sporelings in Porphyra haitanensis (Rhodophyta)

  • Hongxia Jiang
  • Kunshan Gao
  • E. Walter Helbling
Research Article

Abstract

The effects of ultraviolet radiation (UVR 280–400 nm) on the germination of Porphyrahaitanensis conchospores and on the growth and morphogenesis of the subsequent sporelings were investigated by culturing the released conchospores under natural sunlight from 29 September to 6 October 2005. Germination increased with time and was faster when UV-B was excluded using cut-off filters. There were significant negative effects of UV-B radiation on growth and cell division of sporelings, with decreases up to 18% for thallus length, between 6 and 18% for thallus width, up to 29% for thallus area, and between 6 and 14% for cell size as compared to PAR-controls. UV-A had a significant positive effect on morphogenesis, enhancing the formation of sporelings with cells dividing transversely; on the other hand, UV-B delayed the formation of such sporelings. We also tested the effects of solar UVR on the growth of P.haitanensis juveniles and found no significant effects. Our results indicate that UV-A has an important role in the germination and morphogenesis of the species, but on the other hand, sporelings of P.haitanensis are more sensitive to UV-B radiation than juveniles.

Keywords

Macroalgae Ulva Relative Inhibition Transverse Division Enrich Seawater 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgments

This work was supported by the Chinese “863” project (No. 2006AA10A413) and National Natural Science Foundation of China (Project No. 90411018). We acknowledge Yingke Seaweed Cultivation Ltd. in Nan’ao Island for providing P. haitanensis conchospores. We thank Gang Li for the experimental assistance and Weizhou Chen for his kind support. The experiments performed comply with the current laws of China.

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Copyright information

© Springer-Verlag 2007

Authors and Affiliations

  • Hongxia Jiang
    • 1
  • Kunshan Gao
    • 1
    • 2
  • E. Walter Helbling
    • 3
  1. 1.Marine Biology InstituteShantou UniversityShantou, GuangdongChina
  2. 2.State Key Laboratory of Freshwater Ecology and BiotechnologyInstitute of Hydrobiology, Chinese Academy of SciencesWuhan, HubeiChina
  3. 3.Estación de Fotobiología Playa Unión and Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET)Rawson, ChubutArgentina

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