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Plant and Cell Physiology, 1997, Vol. 38, No. 2 210-212
© 1997

Short Communication

The Orientation and Localization of Cortical Microtubules in Differentiating Conifer Tracheids during Cell Expansion

Ryo Funada1, Hisashi Abe1,2, Osamu Furusawa1, Hanae Imaizumi1,3, Kazumi Fukazawa1 and Jun Ohtani1

1 Department of Forest Science, Faculty of Agriculture, Hokkaido University Sapporo, 060 Japan
2 Forestry and Forest Products Research Institute Tsukuba Norin, P.O. Box 16, Ibaraki, 305 Japan
3 Hokkaido Forest Products Research Institute Nishikagura, Asahikawa, 071-01 Japan

Arrays of cortical microtubules (MTs) on radial walls in differentiating tracheids of Taxus cuspidata were randomly oriented when primary walls formed. The orientation of MTs changed progressively from longitudinal to transverse as cells expanded. During formation of primary walls, MTs in differentiating tracheids disappeared locally at sites of future intertracheal bordered pits. In further differentiated tracheids, circular bands of MTs were observed around the edges of developing bordered pits.

(Received July 17, 1996; Accepted November 11, 1996)
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