A Study on the Distribution of Pits on the Tracheid in Pinus koraiensis

잣나무 가도관(假導管)의 벽공(壁孔) 분포(分布)의 변이(變異)

  • Received : 1993.10.08
  • Published : 1993.12.30

Abstract

In the present paper, we discribed distributions patterns of pits on the tracheids of Pinus koraiensis. The number of bordered pits on a tracheid is more numerous than that of cross-field pittings. And they appeared different in the number depending on the shape and size of tracheids. Both pit and cross-field pitting on a tracheid is fewer in number near the pith. The number of bordered pits on the tracheid increased rapidly from pith toward cambial zone but that of cross-field pittings increased gradually. The number of bordered pit and corss-field pitting is more frequent in the first-formed tracheid, and the number of bordered pit decreased rapidly from earlywood to latewood but that of corss-field pittings decreased gradually. Bordered pits on a tracheid are more numerous at the end of tracheids and cross-field pittings occur more frequently in the center part of a tracheid.

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