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1 September 2000 Impact of UV Radiation on the Early Development of the Giant Kelp (Macrocystis pyrifera) Gametophytes
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The mechanisms and dose-response of UV action on the early development of Macrocystis pyrifera (L.) C. Agardh gametophytes were investigated. Post-release, zoospores undergo germination, germ tube elongation, DNA synthesis, nuclear division and translocation, which were followed for 41 h under laboratory conditions. The spores were exposed to UV radiation before germination (3 h post-release) or before nuclear division (20 h post-release). Biologically effective UV-B doses (BEDDNA300 nm) higher than those used in the experiments are needed for a 50% inhibition in germination (BED50 > 1600 J m−2). Nuclear division/translocation was more sensitive to UV radiation. When the spores were cultured in the dark, UV exposure at both 3 and 20 h post-release resulted in a dose-responsive inhibition of nuclear division/translocation (BED50 64 and 86 J m−2). Culturing in the light indicated recovery in the spores that were irradiated at 3 h post-release (BED50 356 J m−2), whereas no light-dependent recovery occurred within 41 h of culture when irradiated at 20 h post-release (BED50 80 J m−2). The results present a possible mechanism of UV inhibition in early life stages of the giant kelp, suggesting that environmentally relevant UV-B levels can perturb or delay the development and recruitment of the gametophytes by inhibiting nuclear events.

Pirjo S. Huovinen, Aimo O. J. Oikari, Markus R. Soimasuo, and Gary N. Cherr "Impact of UV Radiation on the Early Development of the Giant Kelp (Macrocystis pyrifera) Gametophytes," Photochemistry and Photobiology 72(3), 308-313, (1 September 2000).<0308:IOUROT>2.0.CO;2
Received: 3 January 2000; Accepted: 1 June 2000; Published: 1 September 2000

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