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[A-5.3 Assessment of the Effects of Enhanced UV-B on Marine Algae]

[Contact Person]

Masayuki Yamamoto
Chief Researcher, Demonstration Laboratory
Marine Ecology Research Institute
4-7-17 Arahama, Kashiwazaki, Niigata 945-03 Japan
Phone +81-257-24-8300, Fax +81-257-24-5576

[Total Budget for FY1990-1992]

14,053,000 Yen

[Abstract]

　UV-absorbing components of several red algae, which are suggested to be concerned with the protection against solar UV radiation, were estimated, and experimental cultivations with and without UV irradiation were carried out. The ethanol extractions of red algae usually had two peaks of optical density in their UV absorption spectra, which indicated UV-absorbing components. However, some species of red algae examined here lacked one of, or both of two peaks. Effects of UV-B radiation on red algae were observed as one of, or some of, decline of growth rate, discoloration or necrosis of cells, decrease of photosynthetic pigments, and increase of UV-absorbing components. However, responses to UV-B irradiation differed with species of red algae. The relationship between the tolerance or acclimatization to enhanced UV-B and UV-absorbing components of seaweeds is needed to be examined.

[Key Words]

Seaweed, UV-B, Growth, Photosynthetic pigments, UV-absorbing component