Biosynthesis and Biodegradation of Wood Components by Takayoshi Higuchi

By Takayoshi Higuchi

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E. Timell, private communication, 1984). Although the morphology is different, the distribution of lignin in compression wood tracheids is about the same as in normal wood, except that the concentrations of lignin are higher and that no lignin is present at the cell corner middle lamella. A repeatedly observed peculiarity in compression wood is a ring in the S layer (S (L)] in which the lignin concentration is about the same as it is in the middle lamella. Table IV shows a comparison made by Timell (1982) of the lignin concentrations measured by Wood and Goring (1971) on Douglas fir and by Fukazawa (1974) on Japanese fir {Abies sachalinensis Fr.

Fig. 2 1 . Polarized-light photomicrographs of transverse oblique sections, a, From Ostrya japonica. b, From Moms bombycis. c, From Pterocarya rhoifolia. N o t e the different layered structure in the secondary wall of hardwood v e s s e l s . N o t e that a, b, and c are the three-layered, undetectable layering, and multilayered structures, respectively. From Kishi et al. (1977). The primary wall is composed of Pi with microfibrils of almost parallel orientation to the ray cell axis, of P with the network appearance of microfibrils, and of P with several crossed lamellae at microfibrillar an­ gles of 30-60° (Fig.

Harada, H . , and Saiki, H. (1977). Bull. Kyoto Univ. For. 49, 122-126. , Harada, H . , and Saiki, H. (1979). Mokuzai Gakkaishi 25, 5 2 1 - 5 2 7 . , Harada, H . , and Saiki, H. (1981a). / . Soc. Mater. Sci. Jpn. 30, 6 7 3 - 6 7 8 . , Harada, H . , and Saiki, H. (1981b). Mokuzai Gakkaishi 27, 3 4 3 - 3 4 9 . , Harada, H . , and Saiki, H. (1982). Bull. Kyoto Univ. For. 54, 2 0 9 - 2 1 6 . , and Utsumi, N . (1951). Unpublished. Meier, H. (1964). In " T h e Formation of W o o d in Forest T r e e s " (M.

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Biosynthesis and Biodegradation of Wood Components by Takayoshi Higuchi
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