63 電子顕微鏡による針葉樹仮導管細胞膜の観察について
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The study on the way in which the fibrills in the cell wall of a tracheid are arranged with respect to the morphological axis of a tracheid plays an important role in the structural investigation of a cell wall. An electron-microscopic method (by the replica) has been employed in this examination of the fine structure of a pit-membrane and the fibrillar orientation-especially near the borderd pit-in the secondary wall of conifer tracheids from HINOKI (Chamaecyparis obtusa) -and EZOMATSU (Picea jezoensis) wood. The 2-replica (the ethylmetaacry-late-Al, Cr-shadowed method by Tsuchikura and Akabori (1952)) was made on the surface of a piece of air-dried wood whittled by means of a plane or a microtome.Results observed are as follows;1) The pile direction of every two layers (for instance the outer and the central layer) in the secondary wall of a tracheid which has a different fibrillar orientation to the longitudinal cell axis, lies sometimes is the same direction, and sometimes in another direction (Fig. 1,2). And the tertiary wall (so-called the particle structure (Fig. 3)) which appears on the inner surface contacting the lumen of a tracheid is found in a tracheid of HINOKI-, AKAMATSU (Pinus densiflora)-and SUGI (Cryptomeria japonica) wood, but not in that of EZOMATSU wood (Fig. 10).2) In the past the radial structure of the pitmembrane of a borderd pit was observed by the optical microscope (Fig. 4), and the results were not sufficiently minute, but the electron-micrographs (Fig. 6,7) show its structure radially-from the torus-fibrillar arrangement (the diameter of a fibrill is about 200-1000Å), and the distance of a so-called pit membrane pore between two radial fibrills is presumed to be about 0.1-0.7μ in EZOMATSU tracheids.3) The particle structure is also represented on the surface of the pit-border in contact with the pit chamber of HINOKI tracheids (Fig. 8).In the outer layer (the pit-border) of the secondary wall of the borderd pit, the fibrills have a circular orientation around the aperture of a pit (Fig. 6), and the fibrills except that of pit-border generally orient at a certain direction, but they deflect as they approach the pit-border (Fig. 8), Though the fibrills orient at a relatively steep angle to the longitudinal cell axis in the central layer of the secondary wall, they deflect somewhat around the inner aperture of the borderd pit, and the long axis of the pit aperture is parallel to the fibrillar orientation (Fig. 5,9). In the inner layer of the secondary wall the fibrills orient at a large angle to the longitudinal cell axis, and they deflect also around the inner aperture of the bodered pit (Fig. 10).4) The long axis of the inner aperture of a bordered pit of a tracheid in contact with the ray parenchyma cell parallels to the fibrillar orientation of the central layer in the secondary wall as OHARA reported (1939) (Fig. 11).
- 一般社団法人日本森林学会の論文
- 1952-11-25
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関連論文
- 木材の細胞膜の構造
- 木材組織の電子顕微鏡による研究 : 主としてイボ状構造と紋孔閉鎖膜の構造について(第65回日本林学会大会)
- 519. 再び針葉樹仮導管のイボ状構造について(第64回日本林学会大会)(ON THE 64 th MEETING OF THE JAPANESE FORESTRY SOCIETY)
- 304. 広葉樹材の紋孔の電子顕微鏡的研究(第63回日本林学会大会講演要旨)
- 63 電子顕微鏡による針葉樹仮導管細胞膜の観察について
- 木材の細胞膜構造の電子顕微鏡的研究