2002 Fiscal Year Final Research Report Summary
Basic studies on responses of tree stems to gravitational stress and reaction wood formation
| Project/Area Number |
12460070
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
林学
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| Research Institution | Tottori University |
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Principal Investigator |
YAMAMOTO Fukuju Tottori University, Fac. of Agr., Professor, 農学部, 教授 (60112322)
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| Co-Investigator(Kenkyū-buntansha) |
HONMA Tamaki Tottori University, Fac. of Agr., Res. Associate, 農学部, 助手 (90294347)
FUNADA Ryo Hokkaido University, Grad. School of Agr., Assoc. Prof., 農学部, 助教授 (20192734)
NAKAMURA Teruko Japan Women's University, Fac. of Sci., Professor, 理学部, 教授 (30060651)
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| Project Period (FY) |
2000 – 2002
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| Keywords | compression wood / ethylene / Indoleacetic acid / gibberellin / abscisic acid / methyl jasmonate |
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| Research Abstract |
Eight-year-old Metasequoia glyptostroboides seedlings were tilted at a 45^o angle for 2 weeks to induce compression wood formation on the lower side of the stems. After being sampled for analyses of cambial region ethylene emission and endogenous indole-3-acetic acid (IAA) content, the remaining seedlings were tilted to the opposite orientation to change the upper and lower sides to each other and kept for 2 more weeks till sampled. Cambium-emanated ethylene was measured by gas chromatography - flame ionization detection, endogenous IAA was measured by gas chromatography - mass spectrometry (GC-MS), and tracheid production and compression wood formation were determined by microscopy. The results showed that tracheid production was promoted and compression wood tracheids developed always on the gravitationally lower side of the stems either in the original tilting or the subsequent reversal tilting period. Those were companied by an increase in endogenous IAA concentration in and an accelerated ethylene emission rate from the cambial region of the side. Reversal of tilting orientation changed the distribution of endogenous IAA and ethylene, which were correlated with the distribution of compression wood on the transverse stem sections. The roles of both hormones in compression wood formation are comparatively studied. In addition, the methyl jasmonate effects on the elongation of seedlings in Japanese flowering cherry, distribution of gibberellin A1, indole-3-acetic acid and abscisic acid in weeping and upright types of Japanese cherry, Prunus spachiana, changes in levels of endogenous plant hormones in cambial regions of stems of Larix kaempferi at the onset of cambial activity in springtime, and fusiform cells in the cambium of Kalopanax pictus were studied.
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