Journal Article

Synthesis of a Callosic Substance during Rhizoid Differentiation in <i>Spirogyra</i>

Shin-ya Yamada, Seiji Sonobe and Teruo Shimmen

in Plant and Cell Physiology

Published on behalf of Japanese Society of Plant Physiologists

Volume 44, issue 11, pages 1225-1228
Published in print November 2003 | ISSN: 0032-0781
Published online November 2003 | e-ISSN: 1471-9053 | DOI: http://dx.doi.org/10.1093/pcp/pcg152
Synthesis of a Callosic Substance during Rhizoid Differentiation in Spirogyra

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  • Biochemistry
  • Molecular and Cell Biology
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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.

Keywords: Keywords: Ca2+ — Callosic substance — Differentiation — Rhizoid — Spirogyra — Tip growth.; Abbreviation: APW, artificial pond water.

Journal Article.  2093 words.  Illustrated.

Subjects: Biochemistry ; Molecular and Cell Biology ; Plant Sciences and Forestry

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