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Diurnal Periodicity of the Expression of Genes Involved in Monolignol Biosynthesis in Differentiating Xylem of <i>Cryptomeria japonica</i>
Laboratory of Bio-Material Physics, Graduate School of Bioagricultural Sciences, Nagoya University, Nagoya, Japan
Laboratory of Bio-Material Physics, Graduate School of Bioagricultural Sciences, Nagoya University, Nagoya, Japan
Laboratory of Bio-Material Physics, Graduate School of Bioagricultural Sciences, Nagoya University, Nagoya, Japan
Laboratory of Bio-Material Physics, Graduate School of Bioagricultural Sciences, Nagoya University, Nagoya, Japan
- 1 Laboratory of Bio-Material Physics, Graduate School of Bioagricultural Sciences, Nagoya University, Nagoya, Japan
- 2 Laboratory of Bio-Material Physics, Graduate School of Bioagricultural Sciences, Nagoya University, Nagoya, Japan
- 3 Laboratory of Bio-Material Physics, Graduate School of Bioagricultural Sciences, Nagoya University, Nagoya, Japan
- 4 Laboratory of Bio-Material Physics, Graduate School of Bioagricultural Sciences, Nagoya University, Nagoya, Japan
American Journal of Plant Sciences·Volume 07 (2016)·Pages 2457–2469·Published 8 December 2016·DOI10.4236/ajps.2016.717214
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Abstract
The cell wall in wood is mainly composed of three components: cellulose, hemicellulose and lignin. According to electron microscopy observations of the innermost surface of cell walls in the tracheids of Cryptomeria japonica , cellulose microfibrils are deposited during the day and a matrix containing hemicellulose is deposited at night. This indicates that the deposition of cell wall components exhibits diurnal periodicity. To gain new insights into the diurnal periodicity of lignin deposition not revealed by microscopic observations, we examined diurnal fluctuations in the expression of genes involved in monolignol biosynthesis in C. japonica saplings grown in the field and in growth chambers under a 12 h light/dark cycle. In the field experiment, two gene expression peaks were observed daily, at dusk and dawn. In the growth chamber experiment, two daily peaks were observed 0 h and 6 - 9 h after the light switched on.
Keywords<i>Cryptomeria japonica</i>Diurnal PeriodicityMonolignolSecondary WallTracheid
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