Abstract
Eight-year-old Metasequoia glyptostroboides seedlings were tilted at a 45° angle to induce compression-wood formation on the lower side of the stems. After 2 weeks of treatment, half of the seedlings were sampled and the remaining half were tilted to the opposite orientation to exchange the upper and lower sides and were kept for 2 more weeks until sampled. Cambium-emitted ethylene was analyzed by gas chromatography with flame-ionization detection. Endogenous indole-3-acetic acid (IAA) was measured by gas chromatography-mass spectrometry. Tracheid production and compression-wood formation were determined by light microscopy. Anatomical studies showed that tracheid production was promoted and compression-wood tracheids always developed on the gravitationally lower side of tilted stems in both the original tilting and the subsequent reverse-tilting periods. These were accompanied by an increase in IAA content in and an accelerated ethylene-evolution rate from the cambial region of the same side.
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Acknowledgement
This research was supported by a Grant-in-Aid for Scientific Research (B) (number 12460070) from the Ministry of Education, Culture, Science and Technology, Japan.
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Du, S., Sugano, M., Tsushima, M. et al. Endogenous indole-3-acetic acid and ethylene evolution in tilted Metasequoia glyptostroboides stems in relation to compression-wood formation. J Plant Res 117, 171–174 (2004). https://doi.org/10.1007/s10265-003-0135-1
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DOI: https://doi.org/10.1007/s10265-003-0135-1