J Integr Plant Biol. ›› 1963, Vol. 11 ›› Issue (4): -.

• Research Articles •    

A Quantitative Investigation on the Arrangement of the Mechanical Tissue in Bamboo Culm

C. H. Yu and J. W. Chang   

Abstract: 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.

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