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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Porphyra ： ウィキペディア英語版 Porphyra ''Porphyra'' is a coldwater seaweed that grows in cold, shallow seawater. More specifically, it is a foliose red algal genus of laver, comprising approximately 70 species.〔Brodie, J.A. and Irvine, L.M. 2003. ''Seaweeds of the British Isles.'' Volume 1 Part 3b. The Natural History Museum, London.ISBN 1 898298 87 4〕 It grows in the intertidal zone, typically between the upper intertidal zone and the splash zone in cold waters of temperate oceans. In East Asia, it is used to produce the sea vegetable products ''nori'' (in Japan) and ''gim'' (in Korea). There are considered to be 60 to 70 species of ''Porphyra'' worldwide〔Kain, J.M. 1991. Cultivation of attached seaweeds. in Guiry, M.D. and Blunden, G. 1992. ''Seaweed Resources in Europe: Uses and Potential.'' John Wiley and Sons, Chichester ISBN 0-471-92947-6〕 and seven in the British Isles.〔Hardy, F.G. and Guiry, M.D. 2006. ''A Check-list and Atlas of the Seaweeds of Britain and Ireland.'' British Phycological Society, London. ISBN 3-906166-35-X〕 ==Life cycle== ''Porphyra'' displays a heteromorphic alternation of generations.〔(Porphyra life cycle )〕 The thallus we see is the haploid generation; it can reproduce asexually by forming spores which grow to replicate the original thallus. It can also reproduce sexually. Both male and female gametes are formed on the one thallus. The female gametes while still on the thallus are fertilized by the released male gametes, which are non-motile. The fertilized, now diploid, carposporangia after mitosis produce spores (carpospores) which settle, then bore into shells, germinate and form a filamentous stage. This stage was originally thought to be a different species of alga, and was referred to as ''Conchocelis rosea''. That ''Conchocelis'' was the diploid stage of ''Porphyra'' was discovered by the British phycologist Kathleen Mary Drew-Baker in 1949 for the European species ''Porphyra umbilicalis''. It was later shown for species from other regions as well.〔〔Thomas, D. 2002. ''Seaweeds.'' The Natural History Museum, London. ISBN 0-565-09175-1〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Porphyra」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.