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| Content Provider | Springer Nature Link |
|---|---|
| Author | Seki, Kazuto Orihashi, Ken Sato, Mayumi Kishi, Masari Saito, Naoto |
| Copyright Year | 2012 |
| Abstract | The quantitative compositions of the major constitutive diterpenoids in the rhytidome and secondary phloem of the branch bark of Kuril larch (Larix gmelinii var. japonica) were investigated. The eight major diterpenoids were isolated from a diethyl ether extract of the branch bark of L. gmelinii var. japonica and identified as 13-epimanool (1), larixol (2), larixyl acetate (3), 13-epitorulosyl acetate (4), abietic acid (5), neoabietic acid (6), dehydroabietic acid (7), and isopimaric acid (8). The amount of each diterpenoid was subsequently quantified in both the rhytidome and secondary phloem. All of the diterpenoids were present in both bark tissues, but the amounts were significantly higher in the rhytidome than in the secondary phloem. Developed fusiform resin cavities containing oleoresins were commonly observed in dead secondary phloem captured into the rhytidome of a bark transverse section. The accumulation and distribution of these constitutive diterpenoids in the bark tissues can probably be attributed to terpenoid biosynthesis in the living secondary phloem and the rhytidome formation process. From the viewpoint of constitutive chemical defense in conifers, it is suggested that the tree body may be more effectively defended against natural enemies by the higher amount of diterpenoid amount in the outermost and dead bark tissue, the rhytidome, where the potentially poisonous and easily oxidizable diterpenoids can be safely and stably maintained. |
| Starting Page | 437 |
| Ending Page | 445 |
| Page Count | 9 |
| File Format | |
| ISSN | 14350211 |
| Journal | Journal of Wood Science |
| Volume Number | 58 |
| Issue Number | 5 |
| e-ISSN | 16114663 |
| Language | English |
| Publisher | Springer Japan |
| Publisher Date | 2012-06-20 |
| Publisher Place | Japan |
| Access Restriction | Subscribed |
| Subject Keyword | Constitutive terpenoids Rhytidome phloem Larix gmelinii var. japonica Plant chemical defense Materials Science Wood Science & Technology Characterization and Evaluation of Materials |
| Content Type | Text |
| Resource Type | Article |
| Subject | Biomaterials Forestry |
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