Diurnal differences in the supply of glucomannans and xylans to innermost surface of cell walls at various developmental stages from cambium to mature xylem in Cryptomeria japonica |
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Authors: | Y Hosoo T Imai M Yoshida |
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Institution: | (1) Laboratory of Bio-material Physics, Graduate School of Bioagricultural Sciences, Nagoya University, Nagoya;(2) Laboratory of Biomass Resources Utilization, Graduate School of Bioagricultural Sciences, Nagoya University, Nagoya |
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Abstract: | Summary. We investigated the diurnal differences in the innermost surface of tracheid cell walls at various developmental stages from
cambium to mature xylem. Cryptomeria japonica saplings were cultivated in a growth chamber with a light cycle set at 14 h of light and 10 h of darkness. Samples were collected
from the saplings during both the light and dark periods. The innermost surface of cell walls was immunogold-labeled with
anti-glucomannan or anti-xylan antiserum and was observed by field emission scanning electron microscopy. Diurnal differences
in the aspect of the innermost surface of cell walls were seen only in S2-layer-forming tracheids; cellulose microfibrils were clearly evident during the light period, and amorphous material containing
glucomannans and xylans was prevalent during the dark period. Cellulose microfibrils were present at the primary-wall formation
and S1-layer-forming stages, and many warts were observed in the mature tracheids, regardless of the time of sampling. The densities
of labeled glucomannans on the innermost surface of cell walls in S1- and S2-forming tracheids and of labeled xylans in S2-forming tracheids during the dark period were significantly higher than those during the light period. These results suggest
a diurnal periodicity in the supply of cell wall matrix containing hemicellulose to the innermost surface of developing secondary
walls.
Correspondence and reprints: Laboratory of Bio-material Physics, Graduate School of Bioagricultural Sciences, Nagoya University,
Nagoya 464-8601, Japan.
Present address: Chair of Climate Change Science for Forestry and Water Resources, Graduate School of Science and Technology,
Niigata University, Niigata, Japan. |
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Keywords: | : Cell wall Cryptomeria japonica Diurnal periodicity Field emission scanning electron microscopy Immunogold labeling Tracheid |
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