Pungent sesquiterpene lactones of the european liverworts Chiloscyphus polyanthus and Diplophyllum albicans |
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Authors: | Yoshinori Asakawa Masao Toyota Tsunematsu Takemoto Claude Suire |
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Affiliation: | 1. Institute of Pharmacognosy, Tokushima-Bunri University, Yamashiro-cho, 770 Tokushima, Japan;2. Laboratoire de Botanique, Université de Bordeaux 1, Avenue des Facultés, 33405 Talence, France |
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Abstract: | The characteristic pungency of the European liverwort, Chiloscyphus polyanthus, is due to a mixture of four sesquiterpene lactones, two new structures ent-5β-hydroxydiplophyllin and ent-3-oxodiplophyllin, and the previously known diplophyllin and diplophyllolide. A new dihydrodiplophyllin, together with the pungent diplophyllolide and diplophyllin, has been isolated from Diplophyllum albicans. Ent-dihydrodiplophyllolides derived from the above pungent diplophyllolides produce intense numbness of the tongue. All pungent sesquiterpene lactones showed inhibitory activity towards the germination and root elongation of rice husks. |
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Keywords: | Hepaticae pungency plant growth inhibitory activity sesquiterpene lactones. |
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