UV Protection in the Photosymbiotic Ascidian Didemnum molle Inhabiting Different Depths(Physiology)
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概要
- 論文の詳細を見る
Didemnum molle is a colonial ascidian that harbors the prokaryotic photosymbiont Prochloron in its cloacal cavity. Colonies occur over a relatively wide bathymetric range (approximately 0-30 m), and colony color is widely variable, partly depending on depth. Colonies in shallow sites are bright white, with densely distributed spicules, and often with brown or dark gray pigmentation, while colonies in deeper sites are less pigmented, with sparsely distributed spicules. Didemnum molle colonies contain mycosporine-like amino acids (MAAs) as UV-absorbing substances. These include mycosporine-glycine, shinorine, and porphyra-334. Among colonies from 5-, 10-, 15-, and 20-m depths, the concentration of total MAAs was significantly high at 10 m and low at 20 m. Colonies at 10 m need to maintain low spicule densities to have enough photosynthetically active radiation (PAR) to maintain the photosymbionts, and they probably concentrate MAAs to block UV radiation without attenuating PAR. Because high levels of PAR cause photoinhibition of photosynthesis, spicules and pigment cells would be more effective for photoprotection in shallow water. Colonies of D. molle may adjust the light conditions for photosymbionts by combining MAAs, spicules, and pigment cells in varying amounts.
- 社団法人日本動物学会の論文
- 2006-01-25
著者
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Hirose Euichi
Department Of Biology Keio University:(present Office)biological Laboratory College Of Agriculture A
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WATANABE Makoto
Environmental Microbiology Laboratory, Nat. Inst. of Environmental Research
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Hori Kimiko
Department Of Chemistry Biology And Marine Science Faculty Of Science University Of The Ryukyus
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Kasai Fumie
Environmental Biology Division National Institute For Environmental Studies
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Kasai Fumie
Environmental Biology Division Naitonal Institute For Environmental Studies
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Hirabayashi Shuichi
Environmental Biology Division, National Institute for Environmental Studies
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Hirabayashi Shuichi
Environmental Biology Division National Institute For Environmental Studies
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Watanabe Makoto
Environmental Biology Division National Institute For Environmental Studies
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Hirose Euichi
Department of Chemistry, Biology, and Marine Science, Faculty of Science, University of the Ryukyus
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