Effect of the water status within a tree on tracheid morphogenesis in Cryptomeria japonica D. Don |
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Authors: | H Abe T Nakai |
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Institution: | (1) Forestry and Forest Products Research Institute, Tsukuba Norin P.O.Box 16, Ibaraki 305-8687, Japan e-mail: abeq@ffpri.affrc.go.jp Tel.: +81-298-733211 ext. 574 Fax: +81-298-733798, JP;(2) Interdisciplinary Faculty of Sciences and Engineering, Shimane University, Matsue, Shimane, 690-8504, Japan, JP |
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Abstract: | Three-year-old cloned trees of Cryptomeria japonica D. Don growing in a growth cabinet, in which the temperature, relative humidity and light conditions could be controlled
automatically, were irrigated every day or every 3 days. The xylem pressure potential of the leaves was measured using a pressure
chamber. The tangential strain of each stem was monitored with a strain gauge. After about 1 month the trees were cut, and
the anatomical features of tracheids and cambial cells were observed. In trees irrigated every day, the tangential strain
of the stems increased gradually with a regular diurnal pattern. On the other hand, in trees irrigated every 3 days, both
the maximum and the minimum tangential strains within a stem increased every 3 days. In both irrigation conditions, the tangential
strain showed a minimum value immediately before irrigation, and a maximum value around the onset of light within a day. The
fluctuation of xylem pressure potential was similar to that of the tangential strain in both irrigation conditions. Stems
of trees irrigated every 3 days shrank and swelled more than those irrigated every day with the same water potential change.
The diameter of tracheids produced during the experimental period was larger in trees irrigated every day and smaller in trees
irrigated every 3 days than that before the experiment. The number of cell layers of cells in the cell expanding zone and
the cambial zone, and the tracheid diameter in the cell expanding zone were smaller in trees irrigated every 3 days than in
trees irrigated every day.
Received: 1 February 1999 / Accepted: 17 June 1999 |
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Keywords: | Tracheid Stem tangential strain Xylem pressure potential Cell turgor |
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