Sesquiterpenoids of Laurencia majuscula (Ceramiales, Rhodophyta) from the Ryukyu Islands, Japan |
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Authors: | Michio Masuda Taiji Itoh Yoshihide Matsuo Minoru Suzuki |
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Institution: | Division of Biological Sciences, Graduate School of Science, Hokkaido University, Sapporo 060, Japan;Division of Material Science, Graduate School of Environmental Earth Science, Hokkaido University, Sapporo 060, Japan |
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Abstract: | Two populations of the red alga Laurencia majuscula (Harvey) Lucas (Rhodomelaceae, Ceramiales) from Taketomi Island and Hateruma Island, the Ryukyu Islands, Japan, have been characterized on the basis of both morphological features and halogenated secondary metabolite content. These populations have smaller and more slender thalli than those of other regions. Furthermore, the populations contain two chamigrane-type Sesquiterpenoids, (2R, 3R, 5S)-5-acetoxy-2-bromo-3-chlorochamigra-7(14),9-dien-8-one and (2R, 3R)-2-bromo-3-chlorochamigra-7(14), 9-dien-8-one, and a laurane-type sesquiterpenoid, debromoisolaurinterol, as secondary metabolites which are different from those previously reported from other populations. These results are consistent with the concept of ‘chemical races’ within a single species of Laurencia. |
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Keywords: | Ceramiales chemotaxonomy corps en cerise Laurencia majuscula Rhodomelaceae Rhodophyta sesquiterpenoid |
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