Anatomical characteristics of paulownia tomentosa root wood1

초록

This study investigated several anatomical characteristics of Paulownia tomentosa roots. The root wood wa separated into three parts from stem base (top, middle, and base) at different positions below ground. Qualitativ anatomical data suggested that the growth rings in earlywood and latewood were structurally different Furthermore, the root wood vessels were found having 2 to 3 radial multiples and they were appeared in th form of clusters. In addition, some sheath cells and septate axial parenchyma were observed. Regarding th quantitative anatomical characteristics, vessel and ray numbers per mm2, as well as ray width and heigh differed significantly among the top, middle, and base rood wood parts. However, there were no significan differences in vessel diameters, cell wall thickness, and width and length of wood fibers among those parts. Th crystallinity of the root top part was slightly higher than that of the middle and base parts. Furthermore, th vessel numbers, ray numbers, and ray width and height in the near pith (NP) area were higher compared t those in the near bark (NB) area. However, the fiber width and fiber length at NP were lower than those at NB Overall, this study demonstrated some significant differences in the anatomical characteristics of the top, middle and base parts of root wood from Paulownia tomentosa.

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