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

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Abstract

The effects of ultraviolet radiation (UVR 280–400 nm) on the germination of Porphyra haitanensis 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.

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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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Authors and Affiliations

  1. Marine Biology Institute, Shantou University, Shantou, Guangdong, 515063, China

    Hongxia Jiang & Kunshan Gao

  2. State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, Hubei, 430072, China

    Kunshan Gao

  3. Estación de Fotobiología Playa Unión and Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Casilla de Correos No 15 - (9103), Rawson, Chubut, Argentina

    E. Walter Helbling

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  1. Hongxia Jiang
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  2. Kunshan Gao
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  3. E. Walter Helbling
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Correspondence to Kunshan Gao.

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Communicated by K. Yin.

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Jiang, H., Gao, K. & Helbling, E.W. Effects of solar UV radiation on germination of conchospores and morphogenesis of sporelings in Porphyra haitanensis (Rhodophyta) . Mar Biol 151, 1751–1759 (2007). https://doi.org/10.1007/s00227-007-0632-1

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  • DOI: https://doi.org/10.1007/s00227-007-0632-1

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