11(B-7) Thallusin : 海産性大型緑藻類の新規葉状体形成因子の発見(口頭発表の部)

概要

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Ulva and Enteromorpha are two well-known, green marine algal genera. It has been well known that these green macroalgae lose their natural morphology during short-term cultivation under aseptic conditions, or during long-term cultivation in nutrient-added seawater. These phenomena led to the belief that "undefined morphogenetic factors" that were indispensable to the foliaceous morphology of macroalgae existed throughout the oceans. We have previously reported that many bacteria belonging to the Cytophaga-Flavobacterium-Bacteroides group have differentiation-inducing activity against germ-free Monostroma oxyspermum. Moreover, culture supernatants of these bacteria also showed inducing activity in the normal germination of germ-free spores of some Ulva and Enteromorpha plants. We report here for the first time a novel and an intensive algal differentiation inducer named "Thallusin" that was purified from an epiphytic marine bacterium YM2-23 isolated from a green alga. The structure of Thallusin was determined by NMR, MS and X ray diffraction analysis of its derivatives. Thallusin was thought to be a new essential vitamin-like compound of algae and showed extremely strong activity to induce the normal germination of Ulva and Enteromorpha under the germ-free conditions.
天然有機化合物討論会の論文
2004-10-01