J Integr Plant Biol. ›› 1963, Vol. 11 ›› Issue (4): -.
• Research Articles •
C. H. Yu and J. W. Chang
The present paper contributes a knowledge of the quantitative arrangement of the mechanical tissue
in the culm of Phyllostachys pubescens Mazel. Materials are taken from the middle portion of the
selected internodes of 12 culm-specimens collected from Hunan province. All are 4 years of age
and 4–14 cm. in D. B. H. The measurements of the area of fiber strands on transverse sections of
the culm are done directly on the photomicrographs by lineal method (5), and the sq. cm. is used as
the basic unit to denote the amount of the mechanical elements in per unit area or in per “counting
area”, a term originally used by Penskoy (4) to show an area of 1 cm. in length and the width is just
the same as the thickness of the culm wall on its trans- verse section. The so-called layer is an
arbitrary unit for indicating the horizontal position of the culm. It is taken by tangentially dividing
the wall into 10 equal parts, each of them is called a “layer”. Thence the dimension of a
“layer-counting area” is just one tenth as large as that of the corresponding counting area. After an
examination of our results, the variability of the quantitative arrangement of the mechanical tissue in
bamboo culm can be concluded as follows: 1. In different internodes of the same culm, the
quantity of the fiber in counting area is decreased from the bottom upwards, whereas in the unit area,
it is, however, increased. 2. In any internode of the same culm, the quantity of the fiber either in
layer- counting area or in the unit area, is always decreased from the outermost layer inwards. 3.
The range of variability of the fiber amount tends to be greater in different internodes of a single
culm than that in the homologous internode of different culms either in counting area or in unit
area. 4. In the same culm, the range of variability of the fiber shows to be greater in horizontal
direction than in vertical one. 5. As for the quantitative variations of fiber in separate layers, they
are more distinctive in the first to third layer and more prominent in the basal internodes.
C. H. Yu and J. W. Chang. A Quantitative Investigation on the Arrangement of the Mechanical Tissue in Bamboo Culm[J]. J Integr Plant Biol., 1963, 11(4): -.
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