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Plant and Cell Physiology, 2000, Vol. 41, No. 11 1267-1271
© 2000 Oxford University Press

Autolysis during In Vitro Tracheary Element Differentiation: Formation and Location of the Perforation

Jin Nakashima1,3, Keiji Takabe2, Minoru Fujita2 and Hiroo Fukuda1

1 Department of Biological Sciences, Graduate School of Science, The University of Tokyo, Tokyo, 113-0033 Japan 2 Department of Forest Sciences, Graduate School of Agriculture, Kyoto University, Kyoto, 606-8502 Japan

Tracheary elements differentiated from isolated Zinnia mesophyll cells were observed at various times of culture under a scanning electron microscope. Perforation occurred on the primary wall at one of the longitudinal ends in single tracheary elements. In double tracheary elements, which both of two cells derived from a single cell differentiated into, the pore opened on the primary walls both at the junction of the two tracheary elements and at a longitudinal end of one of the two tracheary elements. These results suggest not only that a single tracheary element has its own program to form a perforation at one end without being affected by neighboring cells, but also that isolated cells indeed hold some traces of polarity and cell-cell communication.

3 Corresponding author: E-mail, jean@biol.s.u-tokyo.ac.jp; Fax, +81-3-5841-4462.


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