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Plant and Cell Physiology, 2003, Vol. 44, No. 11 1225-1228
© 2003 Oxford University Press

Short Communication

Synthesis of a Callosic Substance during Rhizoid Differentiation in Spirogyra

Shin-ya Yamada, Seiji Sonobe and Teruo Shimmen1

Department of Life Science, Graduate School of Science, Himeji Institute of Technology, Harima Science Park City, Hyogo, 678-1297 Japan

Abstract

Spirogyra living in running water is anchored to the substratum by rhizoids that form at the ends of the filaments. A new terminal cell differentiates into a rhizoid cell if the filament is injured. The mode of growth changes from diffuse to tip growth when rhizoid differentiation begins. In this study, we found that a callosic substance was synthesized during rhizoid differentiation. Decreasing the cell turgor, lowering extracellular Ca2+ or adding Gd3+, all inhibited the commencement of rhizoid differentiation as well as synthesis of the callose-like substance at the tip of the terminal cell. A callosic substance was also synthesized during formation of the conjugation tube.

Footnotes

1 Corresponding author: E-mail, shimmen{at}sci.himeji-tech.ac.jp; Fax, +81-791-58-0175.


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