M. V. Makarov, G. M. Voskoboinikov
The Influence of Ultraviolet-B Radiation on Spore Release and Growth of the Kelp Laminaria saccharina
The sporogenic tissue, motile zoospores and non-motile embryospores of Laminaria saccharina were exposed to the different levels of the ultraviolet-B radiation (UV-B) (0.1–1.2 W m?2) over 12–24 h. At an irradiance of 1.2 W m?2 spore release began after 4 h exposure of the sporogenic tissue to UV-B. There were also many non-motile spores and the fragments of damaged sporangia found in the media. The motile zoospores ceased their movement after their treatment with UV-B of 1.2 W m?2 for 8210 h, although they retained their viability. The embryospores did not survive after 24 h exposure at an irradiance of higher than 0.6 W m?2. Tolerance to UV-B attenuated in the following sequence: spores within the sporogenic tissue?motile zoospores?embryospores. Our results strongly suggest that UV-B effectively controls spore release, germination and further development of the early ontogenic stages of Laminaria saccharina.
Botanica Marina, Walter de Gruyter
Print ISSN: 0006-8055
Volume: 44, 01/2001
Pages: 89 - 94
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