Journal Article

Flower Stalk Segments of <i>Arabidopsis thaliana</i> Ecotype Columbia Lack the Capacity to Grow in Response to Exogenously Applied Auxin

Kouichi Soga, Kazuyuki Wakabayashi, Takayuki Hoson and Seiichiro Kamisaka

in Plant and Cell Physiology

Published on behalf of Japanese Society of Plant Physiologists

Volume 41, issue 12, pages 1327-1333
Published in print December 2000 | ISSN: 0032-0781
Published online December 2000 | e-ISSN: 1471-9053 | DOI: http://dx.doi.org/10.1093/pcp/pcd066
Flower Stalk Segments of Arabidopsis thaliana Ecotype Columbia Lack the Capacity to Grow in Response to Exogenously Applied Auxin

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  • Plant Sciences and Forestry
  • Biochemistry
  • Molecular and Cell Biology

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Exogenously applied IAA stimulated cell elongation of segments excised from flower stalks of Arabidopsis thaliana ecotype Landsberg erecta (Ler) by increasing the cell wall extensibility, but it did not affect that of ecotype Columbia (Col). Treatment with a low pH buffer solution (pH 4.0) or fusicoccin (FC), a reagent activating H+-ATPases, significantly increased the cell wall extensibility and promoted elongation growth of flower stalk segments of both ecotypes, indicating that the flower stalk segments of Col possess the capacity to grow under acidic pH conditions. IAA promoted the proton excretion in segments of Ler but not of Col. On the other hand, FC increased the proton excretion in segments of Col as much as that of Ler. These results suggest that IAA activates the plasma membrane H+-ATPases in the segments of Ler but not those of Col, while FC activates them in both ecotypes. Flower stalks of Col may lack the mechanisms of activation by IAA of the plasma membrane H+-ATPases.

Keywords: Key words: Acid growth — Arabidopsis thaliana — Auxin — Columbia— Landsberg erecta — Proton excretion.; Abbreviations: Col, Columbia; FC, fusicoccin; Ler, Landsberg erecta.

Journal Article.  4062 words.  Illustrated.

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

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