83 褐藻カヤモノリの蛍光成分と走光性(ポスター発表の部)

概要

論文の詳細を見る
Scytosiphon lomentaria (Japanese name; Kayamonori) is the brown alga and flourishes from winter to spring at the coast of Japan. Its gametes swim with two flagella. The anterior flagellum has mainly a locomotive function and the posterior one has a steering function. In 1988, Kawai discovered that only the posterior (short) flagellum of swamers of this alga showed a remarkable green fluorescence throughout its length. He reported that the fluorescence emission spectrum on its gametes exhibited maximum at 515-520nm upon excitation of 440nm. Therefore, this autofluorescent substance is considered to be a kind of flavin derivative from the spectrum. It has been known that the swarmers of some species of brown algae have an ability to recognize the orientation of light and move to the opposite direction to the sunlight. That is to say, they swim for the sea bottom owing to the negative phototaxis. In the survey of approximately 40 genera in 11 orders of brown algae by Kawai et al., it turned out that all algae showing phototaxis have surely a stigma and a flagellar swelling. Such structures are thought to be related to the photoreception in phototaxis. Moreover, the autofluorescent substance is certainly localized in the flagellum of such swarmers. It is implied that this flavin-like compound acts as a photoreceptive pigment in phototaxis. Such compound has never been isolated yet. These facts prompted us to study the fluorescent substance of the title alga and a function of this compound in phototaxis of swarmers. We tried the isolation of the flagellar autofluorescent entity and its structure determination. Two flavin compounds which increase with growing were detected in methanol or water extracts. Though a major and more stable element (Flavin A, 2) was identified with 4',5'-cyclic FMN, it was not a target compound. On the other hand, a minor and unstable one (Flavin X, 1) was coincident with the fluorescent substance isolated from swarmers. Flavin X (1) has another phosphoric acid group on one of two free hydroxyl groups of Flavin A (2).
天然有機化合物討論会の論文
1993-09-10

83 褐藻カヤモノリの蛍光成分と走光性(ポスター発表の部)

スポンサーリンク

概要

著者

関連論文

スポンサーリンク